A day is the time period of a full rotation of the Earth with respect to the Sun. Over billions of years, the moon has been slowing down a full rotation of the earth due to the tides that the moon ...

One complete rotation of Venus takes 243 Earth days. Imagine a school day that long… To make things stranger, a year on Venus lasts only 225 Earth days. That’s right: a Venusian year is ...

Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

Earth orbits the sun once every 365.25 days. Since our calendar years have only 365 days, we add an extra leap day every four years to account for the difference. Though we can't feel it ...

In the April issue, to mark Earth Day, we’ll publish a guide that separates ... in an era when some people claim that there are no “facts” and basic science is loudly questioned without ...