The Asteroid Belt between Mars and Jupiter contains millions of these rocky fragments, the biggest among them measuring one-quarter the size of the Moon.

UNESCO: MEDIA SERVICES

For ten days of actual observing time, the Hubble pointed to an area on the sky less than one percent of the size of the full moon.

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Try this analogy (thanks to Veritasium.com): if the Earth were the size of a basketball, the moon would be a tennis ball about 24 feet away, and the Sun would be like a house nearly two miles away.

CNN: The sun, the moon and the Titanic

In a section on water in outer space we learn that there is a lake-size layer of ice on the moon's south pole, that Mars once had rivers, that there is steam in the sun's atmosphere.

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But the size of the Earth is a few percent of the distance to the moon, which translates to about a 7% stronger gravitational pull on the near side of the Earth than the far side.

CNN: The sun, the moon and the Titanic