Pluto was once considered to be the smallest planet in our galaxy. As more was discovered about the other planets, and about other objects in our galaxy, Pluto

You may think the Solar System consists of the sun and the eight planets that orbit around it. However, there are other things out there. There are comets, moon

Comets often streak across the night sky. They are fascinating flashes of light, but how much do we really know about them? Here are some things that scientists

How old is Earth? How fast does Earth spin? What is happening to Mount Everest, the highest place on Earth? What is the lowest place on Earth? Learn the answer