- #1
Widdekind
- 132
- 0
Bigger stars are significantly brighter. That pushes back their Habitable Zones (HZs), where D2 ~ L, which makes them look smaller in the skies of (hypothetical) habitable planets, whose years are also a lot longer:
Conversely, cooler stars keep their (hypothetical) HZ planets much closer, where orbital speeds are significantly higher. And, since Impactors typically travel at approximately orbital speeds, Impact Events on those worlds would be correspondingly more severe (since KE ~ v2):
The Distance-to-Snow-Line parameter represents the radial distance from the star's HZ to its Snow-Line, where water turns to ice. This is seemingly crucial in the formation of Gas Giants, like Jupiter, which formed on the Sun's Snow-Line*. Thus, for our Solar System, that distance parameter is (5.2 - 1.0 =) 4.2 AU. If Jupiter-sized Gas Giants formed too close to the HZ, they would surely disrupt any proto-planets coalescing therein.
Code:
Type Mass Temperature Radius Luminosity HZ-Distance Apparent-Size HZ-Year
O 64.0 50,000 16.0 1,400,000 1180 0.00016 5250
B 18.0 28,000 7.0 20,000 141 0.0025 396
A 3.1 10,000 2.1 40 8.9 0.078 15.0
F 1.7 7,400 1.4 6 2.4 0.28 2.94
G 1.1 6,000 1.1 1.2 1.1 1 1.09
K 0.8 4,900 0.9 0.4 0.63 2 0.53
M 0.4 3,000 0.5 0.04 0.20 4 0.16
Code:
Star-Type HZ-Orbital-Speed Impactor-Damage-Ratio Distance-to-Snow-Line ?
O 0.23 0.051 4700
B 0.36 0.13 640
A 0.60 0.36 36
F 0.83 0.69 10
G 1.00 1.00 4.4
K 1.13 1.26 2.4
M 1.23 1.5 0.80
* Carroll & Ostlie. Introduction to Modern Astrophysics, pg. 893.