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How big is the universe?
Explain how do clouds form?
Astronomers usually detect the electromagnetic emissions of a single neutron star in what single form?
This powerful telescope weighs about 11 tons, has a primary mirror 7.9 feet in diameter, and orbits about 380 miles above the earth?
How stars produce energy?
Which other galaxy is similar to the milky way?
What are black holes? Do they exist in reality?
Which is the first unmanned space vehicle which landed on the moon?
What is the difference between a star, satellite and a planet?
Do black holes really exist?
What is the term for the amount of energy released from each square meter of an objects surface each second?
When was the first american manned space mission to moon begun?
Which was the vehicle used for the first landing on the moon?
How was the moon formed?
How long is a year on saturn?
