Learn about the moon phases and when you can see them.
The global average surface temperature in 2017 was estimated to be about 58 degrees Fahrenheit (15 degrees Celsius).
Valentina Tereshkova was the first woman to go into space. She flew Vostok 6 in 1963, spending almost three days in space and orbiting Earth 48 times.
Mars is a very cold planet. The temperature on Mars doesn't get much above 70 degrees F and it can get down to nearly minus 200 degrees F.
Earth's star is the largest and the most massive object in the solar system. More than 1 million Earths could fit inside the sun.