Star dust: greetings from deep space
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Dust is an essential component throughout space. Interstellar dust is the solid phase of interstellar matter from which stars and planets form. Cometary dust is the most pristine material from the early solar nebula. Huge dust clouds are observable, e.g., with the renewed Hubble Space Telescope. Cosmic dust is also attracted by the earth’s gravity and is deposited on the earth’s surface in estimated quantities of 30–1000 t daily. Space exposed surfaces, e.g., of space stations or space vehicles may be seriously eroded by cosmic dust hitting these surfaces. This has been extensively studied by secondary ion mass spectrometry, the key instrumentation for cosmic dust analysis and dust eroded surfaces in combination with scanning electron microscopy. The significance of material degradation of space exposed surfaces has been studied by a “Long Duration Exposure Facility” experiment managed by NASA. Another serious problem is the great amount of debris from older space installations in near-Earth Space. Measures of respective mitigation are outlined. Important chapters, e.g., on the International Space Station (ISS) and the Hubble Space Telescope (HST) refer to new respective information available. A further chapter describes asteroids with much larger “grain sizes” than cosmic dust. The eminent danger upon impact of asteroids on the Earth is outlined for most recent incidents (Tunguska and Chelyabinsk). Exciting missions, such as the Star Dust Mission and the Rosetta Mission, are shortly outlined. Finally, the speed of light and the incredible dimensions of the universe are discussed. This leads to the conclusion that manned space travel is very dangerous for man, and restricted to just the nearer part of our planetary system.
KeywordsCosmic dust: its nature, significance, analytical, and morphological characterization Chondrites and carbonaceous chondrites Materials degradation of space exposed surfaces The importance and characteristics of low earth orbits (LEOs) Essential missions of man into space The Long Duration Exposure Facility (LDEF) Experiment The Hubble Space Telescope (HST) The International Space Station (ISS) Large-particle space debris Space debris mitigation measures Asteroid incidents The speed of light and the magnificence of the univers The eminent dangers of space travel
Introduction: meteorites and cosmic dust—relatively frequent visitors from the deep space on Earth
It is estimated that more than 1000 t of cosmic dust and some coarser rocky materials are reaching the surface of the earth daily! . Another source reports daily that dust quantities of between 30 and 400 t  are reaching the earth. Plane  lists a range of 2–300 t/day. It can be deduced from the great variation of these data that they are only rough estimates and they most likely also vary greatly on the time scale.
This admittedly sounds like the story of a Hollywood film-script, but it is a fact. However, larger particles or big rocks fortunately seldom reach the earth. The latest known case is the meteor of Chelyabinsk which had a diameter of about 19 m.
Chelyabinsk is a city of around half a million inhabitants east of the Ural Mountains in Russia. The meteor had a weight of ca. 20,000 t and exploded at a height of 30 km due to heating of its surface by friction. The meteor had a velocity of about 65,000 km/h (which amounts to 50 times the velocity of sound in air). The airburst of the meteor which broke apart was about 20–30 times the explosion of the atomic bomb at Hiroshima . It did not cause a greater catastrophe, but the pressure wave caused by the meteor broke hundreds of window glasses and also caused some broken or cracked walls in numerous buildings. Fortunately, such events occur very seldom. According to respective statistics of NASA and the ESA, impacts of meteorites which might form a crater of 20 km in diameter upon impact occur only every 100,000 years. In addition, the Space Agency traces all meteorides with diameters of 0.5 km or bigger .
Some explanations of terms frequently used in this paper should be given:
A “meteoride” is an object before it enters the earth’s atmosphere.
A “meteor” is the visible phenomenon.
A “meteorite” is the remaining object that reaches the earth’s surface.
A “comet” is principally very similar to an asteroid. However, the latter had been formed nearer to the sun and, hence, contains less ice than comets. These are born far away from the sun and contain a lot of ice. Some scientists call them “dirty snowballs”. They normally move in the outer realms of the solar system. If they approach the sun, the ice evaporates. Dust and rocky material of the nucleus of the comet form a long and often very impressive tail of the comet. If the comet comes near to the Earth, the smaller rocky material forms a multitude of shooting stars .
Cosmic dust: an essential part of matter in the universe and the basis of the formation of our own solar system
Interplanetary and interstellar dust or, generally, cosmic dust is an essential component throughout space. It constitutes an essential part of total matter of our universe. Interstellar dust is the solid phase of interstellar matter from which stars and planets form. Some of the cosmic dust particles stem from the solar nebula and might have formed 4.56 billion years ago when the solar system developed [5, 6]. Cometary dust is the most pristine material from the early solar nebula. Dusty planetary rings (e.g. of Saturn) are analogues of the interplanetary dust cloud in their own right [6, 7].
Our own solar system formed out of a huge cloud of gas and dust 4.56 billion years ago. The cloud densified under the influence of its own gravity. Since the cloud rotated, it was flattened by its centrifugal force and formed a disk. In its center, the sun was born and around it the planets, planetoids, and comets formed. Such systems had been formed in many places of the vast realms of the Milky Way .
A first characterization of cosmic dust reaching the Earth
The velocity range in space is between ca. 10–70 km s−1. The particles are essentially slowed down in the atmosphere. Classification of their velocity is not found in the available literature.
Dust particles are travelling in space with velocities of at least 10 km/s. If they hit material surfaces, they almost completely evaporate due to their high impact velocity and cause the formation of a crater as will be discussed in more detail in “The significance of material degradation of space exposed surfaces”.
Consequently, material degradation by micro-meteorites is one of the common phenomena space flights have to cope with. Some of the collected particles might be hundreds of million years old before they are trapped by the earth’s gravity and settle to the earth’s surface as will be described in “The study of cosmic dust”.
Explosion of Red Giants, their mass amounts to 0.3–8 times of the mass of our sun .
Explosion of supernovae: these stars thereby loose a part of their matter into deep space in form of dust which forms huge clouds. Hence, they are the most important source of dust in the universe.
Another source is the Belt of Asteroids situated between the orbits of Mars and Jupiter. There, the asteroids frequently collide with each other thereby generating dust and smaller particles [2, 3, 4, 5].
In addition, dust is formed by comets which are disintegrating when coming near to the sun .
Last but not least, atomic and molecular aggregation can take place in the winds of stars. The tiny grains are travelling through space. Some of them might be destroyed again, but other ones might eventually travel to a large dust cloud, where they can contribute to the formation of planets, suns, etc., as described above .
The star dust mission (NASA 2002–2006)
In January 2006, the star dust mission successfully returned dust samples from the tail of comet 81P/Wild2. The dust grains have been analyzed by several US and European groups especially for C, N, and O isotopic compositions by NanoSIMS. Such samples contain isotopic memories of their pre-solar origin or of early solar systems processes. It was found that cometary matter is a diverse assemblage of pre-solar and solar system materials .
Cosmic dust and meteorites: how do they arrive on the earth’s surface?
Some particles are trapped by the earth’s gravity and enter its atmosphere. Cosmic dust particles are also frequently called interplanetary dust particles (IDPs). However, the term “cosmic dust particles” is retained here. Cosmic particles up to about 50 µm can efficiently radiate away the heat which is generated by their slowing down in the atmosphere due to friction. Greater particles cannot do this effectively enough and, hence, burn up in the upper layers of the atmosphere, or explode in the lower atmosphere (cf. to the Chelyabinsk incident in the introductory chapter).
Depending on the atmospheric conditions (wind, weather), this part of the trip of small particles can last several months. They usually endure this travel relatively sound. This is the reason why our planet is gaining daily several tonnes (up to 1000) due to the trapping of extraterrestrial material. This weight gain is in part counterbalanced by a loss of hydrogen, helium, atomic oxygen, and possibly carbon (mainly as methane) in the exosphere as a result of non-thermal escape mechanisms [4, 7].
The study of cosmic dust
The two main methods used for the characterization of dust particles will be shortly mentioned.
Morphology studies by scanning electron microscopy (SEM)
The workhorse for all studies in the micrometer domain is the scanning electron microscope (SEM). All particle morphologies shown in this paper have been produced by SEM. The best and most intensive introduction to SEM and X-ray microanalysis is the book of Goldstein et al. .
Secondary ion mass spectrometry (SIMS): the key instrumentation for cosmic dust analysis
An excellent and short introduction to SIMS is given in . In addition, this article also provides an overview on “Ion Microprobe Isotopic Analysis on Ancient Stardust”.
It is difficult to gain information on the nature of impacting particles due to the fact that most particles are evaporating during the impact. The minute amounts of particle matter which remain on the substrate surface in and around the impact crater can only be detected by the most sensitive method of the topochemical analysis: SIMS. In addition, the ability of SIMS to distinguish between various isotopes of an element is the key to differentiate between terrestrial and cosmic particles [10, 11, 12, 13, 14, 15]. The outstanding significance of SIMS for such investigations consequently led to the development of the NanoSIMS with a dramatically improved lateral resolution in the 10 nm domain (as compared to a lateral resolution in the single-µm range for the conventional SIMS). It also has a multi-detection system which is important, since the amount of material to be sputtered is very limited in this special application [14, 15, 16].
Problems with sampling of interplanetary dust
An ideal collector for cosmic dust particles would gently decelerate the often fragile particles. This is exactly what happens in the outer realms of the earth’s atmosphere as has already been mentioned in “Cosmic dust and meteorites: how do they arrive on the earth’s surface?”. Eventually, the particles are descending with quite low velocities. Interestingly, this also causes a density of cosmic particles in the earth’s atmosphere that is many orders of magnitude higher than in space. To prevent a mixing of cosmic particles with terrestrial aerosols, the sampling has to be carried out in the stratosphere. In the 1960s, it was tried to collect cosmic dust with high flying balloons. However, the yield was very modest. Therefore, NASA initiated a program in the 1970s, in which cosmic dust was collected with U2-planes flying in the stratosphere . For this purpose, palm-sized collecting surfaces had been prepared which were coated with silicon oil. These collecting surfaces were exposed to the air stream of the planes travelling at an altitude of 20 km (twice as high as most commercial traffic) beneath a wing of the plane for several hours. Nevertheless, only a single particle greater than 5 µm is caught per hour. Of these, a very few collected particles in the clean surroundings every second particle is still of terrestrial origin. Often, ash particles from volcanic eruptions are found which had been spewed into the atmosphere. Hence, after greater volcanic eruptions (as, e.g., of the Pinatubo in 1991), the collection of cosmic dust in the stratosphere has to be discontinued for several months, because the volcanic dust clouds are dispersed quickly and thoroughly around the earth.
It goes without mentioning that during sample preparation and investigation, no additional contamination can be tolerated. Work has to be performed under strict cleanroom conditions and, due to the dust grain size, mostly under the microscope. Hence, particles are removed one by one from the collector surface and, subsequently, cleaned from the silicon oil. They are thereby viewed in the light microscope. Afterwards, they are characterized at higher magnification in the SEM. In the following, some typical particle morphologies of extraterrestrial particles are shown.
Some results of the morphological characterization of cosmic dust particles
Chondrites are the most abundant class of meteorites with about 86 % of the latter. Their name is derived from small pellets of silicates which are called chondrules. They are µm-sized and spheroidal and they were once molten droplets. They are imbedded in a matrix which is dominated by the minerals olivine, pyroxene, and plagioklas. Most of them contain metallic nickel–iron and iron–sulfide. Their respective contents vary greatly.
Main constituents for the most abundant types of chondrites and respective concentration ranges in % w/w as well as traces in µg/g according to 
It is believed that the solar nebula from which our solar system developed 4.5 billion years ago had the same chondritic composition. Eventually, the planets and other bodies developed, the composition of which varies considerably and deviates from this original composition because of diverse chemical processes (so-called fractionations). However, material with chondritic composition is still found in some meteorites and many cosmic dust particles. This is an indication that these objects are of “primitive” nature, i.e., a very old and unchanged material .
These contain organic carbon in form of organic molecules as, e.g., amino acids or polycyclic aromatic carbohydrates together with water. This could be an indication that essential components for life may have arrived on the Earth by meteorites . They are black and crumbly and the biggest piece came down to the Earth in Murchison, Victoria, Australia, in September 1969. It is part of a meteorite 4.5 billion years old .
Low earth orbits (LEO) and their nature
The altitude between 180 and 1000 km above the earth’s surface is called low earth orbit(s) (LEO). It is the busiest traffic zone in near-Earth space. Nevertheless, the conditions in LEO are harsh. It is a region of intensive, high-energy UV radiation. The little oxygen still present from the earth’s atmosphere is highly reactive atomic oxygen. It is also a region of high-temperature variations even up to 1500 K. It is full of man-made space debris in addition to cosmic dust micro-meteorites, as will be discussed in more detail in “Large-particle space debris: mortal danger in near-Earth space” [10, 15, 17].
The next region toward free space is called medium earth orbit (MEO). It is the range from 1000 km above the earth’s surface up to 20,000 km. This is the range, in which GPS satellite and Galileo satellite are placed (GPS = geostationary positioning systems). The GPS satellite is at an altitude of exactly 35,786 km above the earth’s surface, where it retains its position above the earth permanently. This is of great importance for many uses of satellites, especially in GPS technology .
The International Space Station (ISS)
The construction of the station started in 1998. It is presently the largest artificial object orbiting the Earth in a height of 300–400 km. The ISS needs 92 min for a complete passage around the earth. The necessary velocity for a stable orbit is 28,476 km/h which is approximately the travelling speed of the ISS. It is powered by 120 kW solar cells with an area of 4500 m2 [18, 19].
Each day, its altitude declines between 50 and 150 m due to friction with air molecules. Whenever a space ship docks on to the ISS, it is tenderly pushed up a bit to maintain its altitude. Only at an altitude of 1,000 km above the Earth is the air resistance low enough, so that a satellite does not loose altitude due to friction . It will de-orbit in 150 years. The cost to date is around 150 billion USD.
The former space station “MIR”
The first space station MIR (Russian: peace, world) was launched by the former Soviet Union in 1986. It was, at that time, the largest artificial object in an orbit around the Earth. It was also the greatest success of the Soviet space technology together with the launch of the Sputnik in 1957 and the first space travel of Yuri Gagarin in 1961. However, since the installation of the ISS, the MIR experienced a great loss of interest and it was, therefore, abandoned: The controlled crash of the MIR took place in 2001 after 15 years in space with approximately 86,300 orbits around the Earth. Some parts sank in the Southern Pacific between Australia and Chile .
A glimpse on transport costs to the ISS
Costs of the transport of one kg material from the Earth to the ISS 
Russian freighter “Progress”
ca. 13,000 €
US Space Shuttle (until 2011)
ca. 35,000 €
Japanese HTV (unmanned)
ca. 35,000 €
ATV (Automated Transfer Vehicle) of the ESA
ca. 43,000 €
Private space transporter
ca. 90,000 €
The significance of material degradation of space exposed surfaces
It has been mentioned earlier that particles are travelling in LEO with velocities of around 10 km/s. When they hit material surfaces, they almost completely evaporate due to their high impact velocity and cause the formation of a crater, which is up to one order of magnitude larger than the impacting particle. This turns out to be a serious problem for space technology, because the impact of a multitude of such particles will quickly deteriorate space exposed surfaces. The mean lifetime, e.g., of solar panels for generation of energy for satellites is, thus, seriously reduced [14, 21].
The LDEF experiment
The Hubble Space Telescope
Large-particle space debris: mortal danger in near-Earth space
However, there is more than cosmic dust and asteroids to worry about in LEO: There is eminent danger of collision of space vehicles with much bigger “particles” of space debris. The reason is a rising number of debris items with more than 10 cm diameter, mainly rocket parts, diverse metal parts like screws or lost wrenches, further astronauts’ gloves, and even frozen faeces from the toilets of space vessels. It all started with 33 military surveillance satellites from the former Soviet Union which had been blown up at the end of their lifetime. Their parts circle the Earth until they lose altitude down to some 90 km when they hopefully burn up totally. Prior, these parts move with about 28,000 km/h in the LEO domain and are only very gradually slowed down by the very thin atmosphere of the earth at these altitudes. It is very fortunate that up to now, there has been no catastrophic collisions with space vehicles, since it is estimated that about 3000 t of debris circle the earth in LEO below approximately 2000 km altitude . The highest respective density of such parts exists between 800 and 1000 km above the earth’s surface. Their number is about 200,000. Furthermore, another 100,000 parts with diameters between 1 and 10 cm and another billion parts with diameters below 1 cm complete this symphony of danger for space vehicles and installations in LEO. To make things worse, the Soviet satellites had been equipped with small atomic reactors as energy source. Hence, radioactive parts are also travelling in LEO as metallic clouds together with other debris from these explosions. Hence, LEO has become something like an international waste disposal.
Space debris mitigation measures
No wonder that this has become a primary source of danger for space flights within the LEO area. NASA, therefore, has installed a watch center which has registered larger pieces of space debris in something like a space-emergency map to save space shuttles and rockets from collisions with scrap. The European Space Operations Centre (ESOC) in Darmstadt (Germany) has also installed a Space Debris Working Group with the same responsibility. There are even regular conferences on Space Debris organized by the European Space Agency (ESA).
Even, a Space Debris Mitigation Handbook has been issued by the ESA . The following quote outlines its main aims:
“The implementation of debris mitigation measures, in particular the de-orbiting of spacecraft and upper stages, is shown to reduce the debris growth to an acceptable level within a few decades. The risk on ground due to re-entering space objects, its assessment, and its control is also analyzed. For on-orbit systems, collision risk reduction by avoidance manoeuvres and passive protection by shielding are outlined. ESA’s handbook also compares recommended debris mitigation and risk reduction practices proposed by several other space agencies” .
More huge particles: the asteroid belt
The nature, structure, and nomenclature of asteroids and comets have been described in detail in [2, 28]. The main number of asteroids is found in the Belt of Asteroids which is situated between the orbits of Mars and Jupiter. Some of these asteroids exhibit pronounced elliptic orbits around the sun. These were caused by interactions with great masses, e.g., of Jupiter, if they come near to it . Such asteroids might also cross the orbits of the Earth or Mars and very infrequently lead to respective collisions which, consequently, cause catastrophic short term climate changes due to the huge amounts of dust transported to the upper regions of the earth’s atmosphere. Several asteroids have been inspected by space ships of Europe, the USA, Russia, and Japan . The most recent fascinating visit is the Rosetta Mission to the asteroid 67P/Churyumov-Gerasimenko, shortly called Tshuri. Previously various missions had taken place to the comet Halley  launched by Russia (two VEGA missions), Japan (also two missions), the USA (Probe called ICE), and one European mission (called Giotto) .
Some notes on the Rosetta Mission
Start: March 02, 2004
Landing on Tshuri: November 12, 2014
This is the most ambitious mission of the European Space Agency (ESA). The aim is the scientific inspection of the previously mentioned comet Tshuri. From the first respective idea to the advent of the space ship at the comet, it took 25 years! Numerous scientists from 17 nations have participated in this extraordinary project which is described in detail in . The asteroid has a size of only 4 × 3.5 km. Consequently its gravity pull is minute: 100 kg on Erath weigh only 1 g on Tshuri [29, p. 205]. Hence, Philae had special fastening mechanisms to be fixed to Tshuri upon landing. Philae performed a great leap of 455 m in height after touchdown. Its final position on Tshuri is not a fortunate one being in the shade of great ice walls. Hence, the solar panels cannot produce energy any more.
It can be concluded that a lot of interesting information had been collected in the course of this landing procedure. Total costs of the Rosetta mission are exceeding one billion Euros.
Very unexpectedly, Philae contacted the ground control of the ESA again and sent 300 packages of data on June 13, 2015. Philae’s temperature was reported to be −35 °C. This contact in June was presumably the very last one from the Lander Philae to the Earth . Furthermore, since Tshuri reached its point nearest to the sun on August 8, 2015, the temperature of Philae sinks considerably, since then.
The mission is named after the Rosetta stone, a slab of volcanic basalt found near the Egyptian town of Rashid (Rosetta) in 1799. The stone revolutionized our understanding of the past. By comparing the three carved inscriptions on the stone (written in two forms of Egyptian and Greek), historians were able to decipher the mysterious hieroglyphics—the written language of ancient Egypt. As a result of this, breakthrough scholars were able to piece together the history of a lost culture.
In analogy to this, the Rosetta Mission should be a very valuable contribution to shed light on our cosmic past .
The Tunguska incident in 1908
The Chelyabinsk incident in 2013
Tunguska Incident  Date: June 30, 1908
The incident was registered worldwide by seismographs
The asteroid was about 30–80 m in diameter. It exploded in a height of ca. 8 km. All trees in an area of 2000 km2 were brought down (ca. 60 millions). Tunguska is a river system in western Siberia. The area is uninhabited
The probably greatest impact of an asteroid happened 65 million years ago in Mexico. It caused the extinction of the dinosaurs. The diameter of this asteroid was about 10 km. It caused the large Chicxulub crater in the sea near the coast of Mexico. Interesting phenomenon: a layer of iridium (transition metal of the platinum group, atomic number: 77, density: 22.56 g/cm3, melting point: 2446 °C) had been deposited in a large area by this impact
Chelyabinsk Incident  Date: Feb 15, 2013
Diameter of the asteroid: 19 m Weight: 12,000 t
Velocity: 19 km/s
Explosion in 30 km above ground in a so-called “Airburst”
Energy freed by the explosion: ca. 500 kt TNT (TNT is the abbreviation for trinitrotoluene). For comparison: The atomic bomb of Hiroshima developed about 12.5 kt TNT. This means that the Chelyabinsk explosion was about 40 times stronger than the Hiroshima bomb. If the path of the asteroid would have been more perpendicular, Chelyabinsk would not exist anymore
The speed of light and the magnificence of the universe
Particles gain weight when they move with very high speed (nearing the speed of light).
At v → c: m → ∞.
Due to the vast dimensions of the universe, the so-called light-year had been introduced in astronomy. It is the almost unimaginable distance the light travels in 1 year :
9,460,730,472,581 km, i.e., approximately 9.5 × 1012 km. Another measure frequently used in astronomy is the astronomical unit (AU): It is the distance between the Sun and the Earth which is about 150 million km. Furthermore, the most distant objects in the presently known universe are some quasars which are about 14 billion light years away . The diameter of the Milky Way (our galaxy) measures 100,000 light-years. The nearest star, Proxima Centauri, is about 4.24 light-years away from us , a distance which will most likely never be overcome by man.
Manned space travel even to our nearest planets is very dangerous and costly
Since we have just seen that the distances in the universe are so unimaginably great and space travel is a very costly affair, it can be concluded that manned space travel even to our neighboring planets is a rather dangerous enterprise. It has been argued that a trip to Mars would be principally possible and it is in the planning stage. The situation for a manned trip to our next inner neighbor planet, the Venus, is worse: Venus exhibits an average surface temperature around 470 °C! Its atmosphere consists of CO2 and little SO2 .
It is very questionable whether such an effort is reasonable—apart from the dangers for the respective space vehicle to be hit by meteorites or other catastrophes . Intensive gamma radiation is another possibly deadly danger in space travel , as well as exposure to highly energetic particles.
It is not surprising that the investigation of interplanetary dust has developed to a most important scientific discipline in the space sciences. Dust is an essential component throughout space. It constitutes a considerable part of the total matter of our universe. Consequently, material degradation by dust particles or “micro-meteorites” is one of the common phenomena space exposed surfaces have to cope with. Hence, space stations and space vehicles may be seriously eroded by cosmic dust hitting these surfaces with great velocity. This has been extensively studied by secondary ion mass spectrometry [14, 25]. This is the key instrumentation for cosmic dust analysis and dust eroded surfaces in combination with scanning electron microscopy. The significance of material degradation of space exposed surfaces has been extensively studied by a “Long Duration Exposure Facility”—experiment managed by NASA (cf. “The LDEF experiment”).
Furthermore, it is a remarkable development that an initial project of pure basic science—the collection and study of cosmic dust—became unexpectedly the solution to an ardent problem of space technology: What effect does the impact of cosmic dust particles exert on space exposed surfaces of materials in complex space installations? This has been demonstrated shortly. Hence, space stations and satellites serve many technological systems, such as GPS and many other important remote sensing stations today. The latter give valuable information, e.g., on the effects of climate change, deforestation, or on the future development of the Earth’s climate. These stations may have a shorter lifetime than anticipated due to surface damage by the bombardment with cosmic particles. It is also an interesting result of this young scientific discipline that a part of the particles which come into the range of the gravity pull of our earth will eventually be trapped by it. Hence, our planet is collecting cosmic dust daily in a quantity of several tonnes. This leads to the conclusion that cosmic dust is not as exotic a material, as we usually think. And every time our window sills or our book shelves are cleaned, we can be sure to dust away also some particles from Deep Space! I would like to close with what I think is an important consideration: The universe in certain areas is beautiful. This is convincingly shown in a great article in the April 2015 issue of the National Geographic  and in other publications [23, 24]. Ultimately, since our Earth has been formed from cosmic dust, we can say that we, too, are children of cosmic dust!
The author wants to thank Dr. Hans Joachim Lunk, Towanda, PA, USA, and Prof. Dr Stephan Weinbruch, Institut für Angewandte Geowissenschaften der TU Darmstadt, Germany, for their valuable suggestions in the course of the preparation of this paper.
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