Planetesimals were the predecessors of the planets. How did planetesimals form? Comets were captured in planet-like orbits around the sun.
Bits of matter collided and clumped together.
Passing asteroids were captured in planet-like orbits around the sun.
Large rocks were ejected from the sun.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

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