peaks during the dark hours before dawn on Tuesday, August 12th, and forecasters say it should be a good show.

NASA scientists are using an infra-red sounder in space to improve short-term weather forecasting.

The sun is entering its 3rd year of eerie calm. Sunspots are rare and solar flares simply aren't happening. Is this "solar minimum" lasting longer than it should? A NASA scientist has examined centuries of sunspot data to find the

Mix moondust with epoxy, add a dash of carbon nanotubes, and spin. The result? A parabolic mirror perfectly suited for a lunar observatory. A NASA scientist has discovered this new recipe for making telescopes out of moondust, and to prove

Mercury's magnetic field is "alive." Volcanic vents ring the planet's giant Caloris basin while the planet itself is surrounded by a plasma nebula of unexpected complexity.

Look beyond the fireworks on 4th of July weekend. A trio of worlds is converging for a pretty sunset sky show.

One hundred years after the Tunguska event in Siberia, scientists review what they've learned about the mysterious blast from the heavens.

This summer, NASA engineers will try to realize a dream older than the Space Age itself: the deployment of a working solar sail in Earth orbit. The name of the device is NanoSail-D and it is scheduled for launch onboard

In 1967, Surveyor 3 landed on the Moon. Two years later, Apollo astronauts visited the little unmanned spacecraft and brought pieces of it home to Earth. Now, a portion of Surveyor's robotic arm, the scoop it used to sample moondust,

Sometimes you just can't believe your eyes. This week is one of those times. Check out the full Moon on June 18th and prepare to be deceived!

NASA's Gamma-ray Large Area Space Telescope (GLAST for short) left Earth onboard a Delta II rocket. "The entire GLAST Team is elated," reports program manager Kevin Grady of NASA's Goddard Space Flight Center. "The observatory is now on-orbit and all

NASA has a daring new mission on the drawing board: Solar Probe Plus, a spacecraft tough enough to visit the sun itself.

NASA's Spitzer Space Telescope has found a bizarre ring of material around the magnetic remains of a star that blasted itself to smithereens. Although rings and spheres of material are common in the universe, this one is not like any

Imagine a billion-ton cloud of gas launching itself off the surface of the sun and then ... doing a cartwheel. That's exactly what happened on April 9, 2008, when a coronal mass ejection or "CME" pirouetted over the sun's limb

NASA's Phoenix spacecraft landed in the northern polar region of Mars Sunday to begin three months of examining a site chosen for its likelihood of having frozen water within reach of the lander's robotic arm.

Gravitationally speaking, the moon is a strange place. Satellites in lunar orbit feel odd, sideways tugs and end up nose down in the moondust. Astronauts standing in the middle of lunar lava seas weigh more than they do standing on

In 2005, NASA astronomers began watching the Moon to see how often meteoroids crashed into the lunar surface. They've just video-taped their 100th explosion.

At long last, astronomers have found one of the Milky Way's mysteriously missing supernovas.

NASA's Phoenix lander is getting ready to touch down on Mars and begin an unprecedented investigation of the Red Planet's arctic realm.

A NASA-funded survey set to begin in 2008 could dramatically increase the number of known planets outside our solar system.