How old is the sun?

How old is Earth?

How did our solar system form?

In light minutes, how far away is our sun?

What are the two different types of optical telescopes?

Which optical telescope uses mirrors?

Which optical telescope uses lenses?

Who invented the telescope?

Which is NOT a type of telescope?

Which of the following is the name of the cluster of galaxies of which the Milky Way belongs?

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