Units and General Data
Distance units |
|
|---|---|
Astronomical unit (AU) |
1.495 978 707 00 × 1011 m |
206 264.8 AU |
|
1 parsec (pc) |
3.085 677 6 × 1016 m |
3.261 563 8 light-years |
|
1 light-year |
9.460730 × 1015 m |
6.324 × 104 AU |
|
Time units |
|
|---|---|
1 sidereal day |
23 h 56 mn 04.098 s (average time) |
1 tropical year |
365.2422 average solar days |
1 sidereal year |
365.2564 average solar days |
Accessible universe |
|
|---|---|
Number of galaxies |
∼1011 |
Hubble parameter |
70.6 km/s/Mpc = 2.2 × 10−18 s−1 |
Age |
13.7 Gyr |
Dark energy content |
68.3 % |
Dark matter content |
26.8 % |
Baryonic matter content |
4.9 % |
Our Milky Way galaxy |
|
|---|---|
Number of stars |
∼1011 |
Diameter |
∼1021 m |
Baryonic mass (stars + gas) |
∼5 1010 MSun ∼ (1041 kg) |
Dark matter mass (up to virial radius) |
∼1012 MSun ∼ (2 1042 kg) |
Distance of the Sun to the galactic center |
2.4 1020 m (=8 kpc) |
Sun |
|
|---|---|
Radius |
6.955 08 × 108 m |
Mass |
1.9891 × 1030 kg |
Solar luminosity |
3.845(8) × 1026 W |
Core temperature |
1.557 × 107 K |
Core pressure |
2.334 × 1016 Pa |
Photosphere temperature |
5,780 K |
Corona temperature |
2–3 × 106 K |
Average... |
|
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Gargaud, M., Irvine, W.M., Rouan, D., Quintanilla, J.C. (2015). Astronomical Data. In: Gargaud, M., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-44185-5_5069
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