Astronomical Constants Name Value astronomical unit (AU) Light-year (ly) parsec

Question

Astronomical Constants Name Value astronomical unit (AU) Light-year (ly) parsec (pc) sidereal year (y) mass of Earth (REarth) equatorial radius of Earth obliquity of ecliptic escape velocity of Earth (VEarth) mass of Sun (Msun) equatorial radius of Sun (RSun) luminosity of Sun (LSun) solar constant (flux of energy received at Earth) 1.496 x 1011 m 9.461 x 1015 m 3.086 x 1016 m-3.262 light-years 3156 x 1075 5.974 x 1024 kg 6.378 x 106 m 23.4 26 1.119 x 104 m/s 1989 × 1030 kg 6.960 x 108 m 3.85 × 1026 w 1.368 13 W/m2 approximately 20 km/s per million light-years, or approximately 70 km/s per megaparsec Hubble constant (Ho)

Explanation / Answer

13)Conversion rate of Sun=4*109 kg/s

Mass of Earth = 5.974*1024 kg

time required to convert to energy = 5.974*1024/4*109 = 1.4935*1015 seconds=47358574.3 years

14)Sun's mass=1.989*1030 kg

proportion of hydrogen in that mass=75%

Mass of hydrogen in Sun=0.75*1.989*1030 = 1.49*1030 kg

15)Initial hydrogen = 1.49*1030 kg

percentage in core=11%

mass in core = 0.11*1.49*1030 kg=1.64*1029 kg

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