Although other planets have rings, none are as spectacular as Saturn's. What makes the planet's stratified rings, and how did they get there in the first place?
The occasional sunspot, like sunspot 1302 that's currently messing with the planet's magnetosphere, can interrupt communications here on Earth. Major solar flares have the potential to cause more havoc. Could a flare-up wipe out all our electronics? See more »
We can't defy the odds of an asteroid taking a turn for Earth forever, so the world's astronomers watch the sky. What happens once they spot something? See more »
Where I live it is pretty common to see "shooting stars" -- streaks of light in the sky at night. How big is a shooting star? Do they land on earth or do they burn up? Do they land on the ground as meteorites? See more »