A 2008 study shows that climate change has caused available water to shrink in the western U.S. during the last half century. And even bigger changes may lie ahead ..

"Now when we look to the future, Greenland and Antarctica are the big gorillas. If Greenland were to melt, it's about 23 feet vertically for sea level." Read more on climate change.

Crewless robotic aircraft will fly into the lowest and most turbulent layers of hurricanes, spiral up the eye, or loiter above the top of the storm to gather data beyond reach using traditional methods.

Astronomers can figure out the mass of a star using a formula based on Kepler's Law. They can also deduce mass by analyzing a star's color.

Do Americans take safe drinking water for granted? Is there lead in our drinking water? Learn more from Marc Edwards, a civil engineering professor at Virginia Tech.

The giant gas cloud measures 11,000 light-years long and 2,500 light-years wide, and it's moving toward the Milky Way at a speed of 150 miles every second.

EarthSky Communications announced today that it has joined Sky in Google Earth in bringing astronomy to millions of Internet users around the world.

By early October, we humans had already consumed all the resources Earth will produce for 2007. That's the basis of Ecological Debt Day, announced by Mathis Wackernagel of the Global Footprint Network.

Will Earth survive an expanding sun? Let's take a look at the star V 391 Pegasi, 45,000 light-years away. It might reveal a possible future for our planet Earth.

The star that is the sun's new twin is called HD 101364 (or HIP 56948). Astronomers say it's almost identical to the sun. And that's interesting because our sun shines on a life-bearing planet. Stars like our sun are rare, according to astronomers. They account for only 4 percent of all stars in our Milky Way galaxy.