Answer:
A). They are the origins of planets.
Explanation:
Planetesimals are described as any of many small, solid, astronomical objects that orbit a star and form protoplanets through mutual gravitational attraction. These are formed of gas and dust and have developed in debris disks. It forms cosmic grains and comes together with other minute planets under the gravitation to form a planet. This definition itself justifies that planetesimals are the origins of planets as these are the origins of planets and hence, option A is the correct answer.
The accurate statement that describes planetesimals is: A. They are the origins of planets.
Planetesimals are small celestial objects that formed from cosmic dust, gas and other materials.
It is believed that planetesimals existed as small planets that are formed billions of years ago when the planets in the solar system were created, thus, they are used in the study of planet formation.
Planetesimal can be referred to as small planets and they exist in various sizes. It is believed that planetesimals collided during planet formation to form planets and other major celestial bodies in the solar system.
Therefore, the accurate statement that best describes planetesimals is:
A. They are the origins of planets.
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