Have you ever wondered what the speed of light meant?
Why do we send worms into space? Find out on this Moment of Science.
Imagine being cooped up for months inside a space capsule or station with other astronauts, constantly checking equipment to make sure everything works.
It seems to be possible for planets in a stable solar system to somehow get off track and run into each other. Is our planet in danger?
During a "meteor shower" bits of rocky material that enter our atmosphere from space burn up because of friction.
Beyond our atmosphere flies a lot of debris. Some fragments can be larger than mountains, but most is space-dust.
NASA is planning to send astronauts back to the moon for long missions. How are the astronauts going to stay in shape in zero or low gravity?
Most extrasolar planets are about the size of Jupiter, not Earth. So, is Earth's size and orbit unique?
If you've ever had to dig a hole and then fill it back in, you may have noticed a mysterious thing: there was always a little dirt left over. Why?
What makes the sun shine? It's a question we rarely give much thought. However, there is a scientific explanation for this commonplace phenomenon.