Assume the density of the material forming planetesimals was 3 × 10³ kg m⁻³. How many 10 km diameter planetesimals would it take to form the Earth, which has a mass of approximately 6.0 ×10²⁴ kg? It is a reasonable approximation to treat these planetesimals as spheres. The volume V of a sphere of radius R is given by:

Transcribed Image Text:

4 3 3 TR =