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

In our galaxy, there are stars and solar systems. There are comets, asteroids and a whole lot of solid material. There is also a lot of space between star syste

When was Mercury discovered? Does Mercury have a magnetic field? How big is Mercury’s atmosphere? Was Mercury bigger in the past? Learn the answer to these qu

The Nile River has amazed people for thousands of years. It runs opposite from most river systems. It floods for miles, pushing back the desert and providing fa

Earth is one of eight planets orbiting around our sun. Our sun is one of billions in our galaxy, and our galaxy is one of billions in the universe. Our galaxy i