How often does earth have a leap year?

_____ are made of pieces of dust or ice.

The two forces that keep planets in orbit around the sun are ____ and ____.

The moon will complete a revolution around the Earth in _____

How are the moon, sun, and earth lined up for a solar eclipse?

____ are leftover pieces of rock fragments that did not come together to form a planet.

What would have to happen to slow down the length of a day on Earth?

Which type of galaxy has a central bulge and curved arms?

The tilt of the Earth is ____ degrees.

If the tilt of the Earth were ___ degrees there would be no seasons.

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