Of the three types of meteorites, which is the most common, in terms of the number of samples, to fall to earth in recorded history?
What substance is responsible for neptunes blue-green color?
How many types of galaxies are there?
Which is largest and most massive star?
Who is the known as the father of indian astronomy?
Tell me how long is a day on saturn?
Does time stop at an event horizon?
Explain how have some stars had time to die since the universe began?
Explain how can space expand faster than the speed of light?
What is the constant called that is the average flux of the suns energy arriving at the earth?
Explain how is venus different to earth?
What are black holes? Do they exist in reality?
What is the distance between two galaxies?