Imagine a piece of string wrapped around the Earth's equator - that's about 40,000km ... thing here is to get a sense of proportion. The circumference of a circle is directly proportional to ...

Uranus has the craziest tilt in your Solar System. Its tilt is about ninety-eight degrees. That means its north pole is ...

It’s a small world. It’s a wide world. Both phrases are used in lyrics, titles and more. A more accurate statement might be: Earth’s circumference (at the equator) is 24,901 ...