Earth's orbit is an ellipse, not a perfect circle. Earth's distance from the Sun varies by about 3 million miles throughout the year. Earth's orbit's semimajor axis is approximately 93 million miles.

According to the Gaia hypothesis, life created Earth—or at least the Earth we know today. This theory, first formulated by chemist James Lovelock in the 1970s, was a hit with the media and the public ...

How old is Earth? Our planet's age is known from a variety of sources, from rocks on our own planet to ones from the moon. When you purchase through links on our site, we may earn an affiliate ...