There used to be nine planets. Now there are eight, or maybe there are nine after all. Whichever you prefer, here is a list of them in the order they appear in the solar system.
Lunar eclipses occur when Earth's shadow blocks the sun. There are three types; the most dramatic is a total lunar eclipse. Find out when the next one will be.
The annual Perseid meteor shower peaks every August and is often the most dazzling meteor display of the year.
A new group of sunspots has produced moderate (M-class) solar flares, but forecasters say it could unleash a large (X-class) flare.
The biggest full moon of 2010 occurs tonight, Friday Jan. 29. What you can see and how best to view the moon.
Revelers can ring in the new year with a cosmic flourish tonight, celebrating the first New Year's Eve blue moon since 1990.
Some stars rely on vampirism to suck the life out of a companion star, while others are rejuvenated in cosmic collisions.
This year's annual Geminid meteor shower is expected to be a doozie, producing up to 140 "shooting stars" per hour.
On Sept. 2, 1859, an incredible storm of charged particles sent by the sun slammed into Earth's atmosphere, overpowered it, and caused havoc on the ground.
In North America, the best time to watch will be between midnight to 4:30 a.m. on Wednesday, Aug. 12.
In a celestial feat any magician would appreciate, Saturn will make its wide but thin ring system disappear from our view Aug. 11.
It has long been known that Galileo observed Neptune, but it was thought that he discounted the object as a star.
After one of the longest sunspot droughts in modern times, solar activity picked up quickly over the weekend.
New image of a gaseous space nebula reveals tens of thousands of giant comet-like knots raining down.
There is an increasingly somber feel of the photographs as Kaguya slides into darkness and demise, aiming at a landing site on an unlit part of the moon.