a. Synodic month and sidereal month.
Synodic month
| Sidereal month
|
It is the time period between any two consecutive full moons or new moons. | It is the time required for one complete revolution around the earth by the moon. |
It has 29(1/2) days. | It has 27(1/3) days. |
b. Asteroids and planets.
Asteroids
| Planets
|
These are bodies that revolve around the sun mainly in between Mars and Jupiter. | These are the heavenly bodies revolving around the sun. |
They are smaller than the planets. | They are bigger than asteroids. |
c. Stars and planets.
Stars
| Planets
|
These are heavenly bodies revolving around the galactic center. | These are the heavenly bodies revolving around the sun. |
They are luminous. | They are non-luminous.
|
They have high temperature. | They have low temperature. |
They are big in size. | They are smaller in size. |
d. Comet and Meteors.
Comet
| Meteors
|
They are broom shaped shining objects with bright head made up of ice. | They are pieces of stone or metal which enters the earth's atmosphere. |
They have long glowing tail like structure. | They have streaks of light falling down towards the earths surface. |
e. Galaxy and constellations.
Galaxy
| Constellations
|
It is the collection of billions of stars. | It is the collection of limited number of stars. |
It has no regular pattern. | it has regular pattern. |
There are about 1011 galaxies in the universe. | There are 88 constellations named so far. |
f. Natural and artificial satellites.
Natural satellites
| Artificial satellites
|
They are created naturally. | They are created and launched artificially. |
They are usually larger in size. | They are usually smaller in size. |