A light year measures

The first manned-mission to land on the moon was commanded by Neil Armstrong and was called

Which layer of the sun is seen during a total solar eclipse?

Most of the objects astronomers observe outside our galaxy show what is called a red-shift. What does this red-shift mean about these objects' motions?

A person weighs more on the Earth than on the moon because the Earth has a greater

Parallax can be used to measure a star's

What are giant collections of clouds of gas and dust, along with many millions of stars, called?

Stars evolve along several different paths and reach different end points, based primarily on what factor?

Which of these causes days and nights

Periodically, there are spectacular meteor showers on Earth. These showers usually occur because the Earth's orbit passes through the remains of

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