Wednesday, 23 May, 2012

Amateur astronomers watch variable stars, asteroids, comets — helping create a better picture of the universe.

Evidence from ice cores in Greenland and Antarctica show how fast the climate has changed in the past. In this era of global warming, you can’t count on a slow, gradual, predictable warming.

Why don’t the rings of Saturn just disappear over millions of years. It’s the recycling, that’s why!

Lunar eclipses are fleeting events, but their history goes deep. And what’s what with that reddish hue?

Tornadoes kill 60 Americans each year. How do we predict tornadoes? How do we make houses safer? Where do tornadoes get their energy?

Chandra links gamma-ray bursts to supernovas. What really causes these gigantic explosions?

Earth Observing System uses satellites to accelerate earth science, oceanography, meteorology and global change.

What was learned on Columbia’s last, tragic mission?

Chandra, the X-ray astronomy telescope, is three years old. We ogle some of its greatest hits. Caution: These bangs are BIG!

Scientists have found ice on Mars. The frozen water, whose quantity may equal Lake Michigan, is within a meter of the surface.