Our galaxy contains about 200 billion stars. Astronomers believed that some of these stars must have solar systems with planets. They went looking – and found

Was Mercury bigger in the past? How did Venus change the way people saw the world? What is happening to Mount Everest, the highest place on Earth? Does Mars hav

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

How big is Jupiter compared to all the other planets in our solar system combined? Is there a surface to the planet Jupiter? Does Jupiter rotate faster of slowe

Earth is one of the four rocky inner planets. Scientists have been studying Earth’s neighbors since ancient astronomers traced their paths in the night sky an