A near-Earth asteroid as wide as the Statue of Liberty is tall could strike Earth on Dec.22, 2032, alerting planetary defense ...

The moon, is only a quarter the size of the Earth. Gravity holds it in an ongoing embrace, its orbit taking nearly 27 and a half days to complete. Planet Earth is about 4.5 billion years old.

Our Sun is 864,000 miles in diameter, the diameter of Earth is 7,926 miles. Despite this dramatic size difference, our Earth is actually far denser than the Sun, so it would only take a minuscule ...

BS4 may be anywhere between 17 and 40 feet across, and will approach at about twice the distance between the Earth and moon.

Continent-size islands deep inside Earth's mantle could be more than a billion years old, a new study finds.