A student is making a model that compares comets and planets.
Which comparison could be part of the model?
1. Size: Comparing the size of comets and planets, showcasing the varying sizes of these celestial bodies.
2. Composition: Comparing the composition of comets (mostly ice and dust) with the composition of planets (mostly rock and gas), highlighting the differences in elemental makeup.
3. Orbits: Comparing the orbits of comets (which are elongated and highly elliptical) with the orbits of planets (which are nearly circular), emphasizing the differing paths these objects follow.
4. Atmosphere: Comparing the presence or absence of atmosphere in comets (usually minimal or absent) versus planets (most have substantial atmospheres), showing the atmospheric variations between these objects.
5. Surface features: Comparing the appearance and geological features of comets (often rugged and irregular) with planets (which can have diverse surface features like mountains, valleys, and oceans), illustrating the differences in physical characteristics.