- A star has its own light.
- Stars twinkle at night.
- The relative positions of the stars do not undergo any noticeable change.
- Since the stars are very far away, the telescope can only make them look brighter but not larger.
- A star has very high temperature.
- There are billions of stars in the celestial sphere.
- A planet has no light of its own. It shines by reflecting the light of the sun.
- Planets do not twinkle.
- Since planets are very mush closer to the earth than the stars are, their motion around the sun is noticeable as a daily shifting of their relative positions in the sky.
- Most planets on the other hand are near enough to the earth to be magnified by the telescope.
- Planets have low temperatures.
- There are only nine planets in the solar system.