Unlike Saturn, which has actual, physical rings, the ring you can sometimes see around the moon is merely an optical illusion.
For a long time people have been fascinated by comets passing by the earth. How close are they? Learn more on this Moment of Science.
Why does earth only have one moon, while other planets have many? Jupiter alone has nearly 40 moons! Learn more on this Moment of Science.
Learn about the most distant object to orbit the sun, on this Moment of Science.
Can you see the man in the moon? Learn about pareidolia on this Moment of Science.
Learn about dung beetles and their nightly travels on this Moment of Science.
Have astronomers found a new planet? Or is an asteroid in our midst?
We usually think of craters as being very old, but some have formed quite recently. Learn about the last asteroid to hit the moon on this Moment of Science.
Did we really go to the moon? "To the Moon... or Not?" on this Moment of Science.
You can see this more easily by imagining what would happen if the earth were flat. The moon would still travel in a horizontal line above the ground; but because it’s also falling, it would come closer and closer to the flat earth until it collided.