Watch our nearest planetary neighbor 'transit' across the sun on Tuesday. You're going to want to some good eye protection.
There's an interesting effect we can sometimes see regarding the moon. It happens when only a tiny sliver is visible shining on one side.
Supernovas explode with a bright burst of radiation, giving off as much energy in a few days as our sun will give off in its entire lifetime.
Learn more about the physics of hot air and why mountain tops are so cold.
Why is the earth round? Why isn't it a cube or a pyramid?
Global warming is a topic of political debate and scientific study these days. Is it happening? Scientists say the evidence is pointing in that direction.
Learn about gravity, stars, and really big lumps on this Moment of Science.
Why are the planets where they are instead of somewhere else?
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Where did our planets come from?