What is Big bang theory?

What is dark matter and dark energy?

Write a note on outer planets?

What are meteors and meteorites?

What is the purpose of ISS?

What are asteroids? Name the biggest asteroid in the solar system.

How are 'Galaxies' formed?

From the following data calculate the period of revolution of the moon around the earth (Radius of the earth = 6400 km; Distance of the moon from the earth = 3.84 x 10⁵km. g = 9.8 m/s²)

An artificial satellite is revolving around the earth in circular orbit at a height of 2000 km at a speed of 7600 m/s, Find its period of revolution if R = 6400 km.

At an orbital height of 600 km. Find the orbital period of the satellite.