Scientists have found fossil evidence from tropical corals that existed at that time, and they have about 400 daily growth rings per year.
Scientists have a new estimate for the geological age of one of Mercury's oldest regions.
When Neil Armstrong took his "one small step", the impression he made was lasting.
The horizon line can be a tricky thing to measure...
What makes science really fun is when you get to do things yourself, so today we're going to be making moon craters.
Watch our nearest planetary neighbor 'transit' across the sun on Tuesday. You're going to want to some good eye protection.
Why is the earth round? Why isn't it a cube or a pyramid?
That low-hanging moon looks like you can reach out and touch it, but it is actually further away than when it is at the sky's zenith, where it looks smaller!
Why is that autumn moon so bright? The Earth isn't receiving anymore light than usual, the timing is just different!