If a star is found with five planets orbiting it,and a process like that described in the solar nebula theory formed the planets,which of the planets would be expected to have the greatest uncompressed density?
A)the one farthest from the star
B)the one with the greatest mass
C)the one with the greatest radius
D)the one closest to the star

Question

Quizplus · Accepted Answer

According to the solar nebula theory, planets form from the accretion of solid particles and the subsequent growth of planetesimals. As these planetesimals grow, they start to gravitationally attract gas in the surrounding protoplanetary disk. The gas that is accreted onto the planetesimals contributes to the planet's overall mass and also compresses the solid material, increasing its density. 
Therefore, the planet closest to the star would experience the greatest amount of gravitational attraction from the gas and dust in the protoplanetary disk, and would therefore have the greatest amount of compression and the highest uncompressed density.

If a Star Is Found with Five Planets Orbiting It,and