Urgent! \Astronomy&physics question?

Tim Li

New member
Planet Justin B: mass=5x10^24, radius=7300km, temperature=500K, semi major axis=0.52AU
Planet Stewie G: mass=2x10^27, radius=85000km, temperature=150K, semi major axis=6.4AU
Planet D Cherry:mass=4x10^23, radius=4500km, temperature=105K, semi major axis=37.8AU

(a) What are the average densities (in g/cm3) of these three planets? Which would you characterise as “terrestrial”, which as “gas giant” and which as “ice giant”, and why?

(b) If the orbital period of planet Justin B is 190 days, what are the periods of the other two planets? What is the mass (in solar masses) of the star around which these planets orbit?

(c) What is the escape velocity (in km/s) of each of these planets?

(d) Which of these planets could retain an atmosphere containing oxygen molecules?

Please help me!
for questions A, B, and C, please just do one planet so that i know how to do the rest!
Thank you!
 
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