Photograph courtesy NASA/JPL/Space Science Institute
A Floatable Planet
Saturn is the only planet in our solar system that is less dense than water. If you could build an imaginary gigantic bathtub, Saturn would float in it. --NASA
The Arctic is warming faster than any region on Earth. See how climate change is dramatically transforming this polar landscape and the animals and plants that depend on it.
NASA's space shuttle program has been marked with both successes and tragedies. Revisit the history of the program and see what NASA's plans are for its future.
Think flu is just a seasonal nuisance? Think again. Less than a century ago, flu killed more than 50 million people in one outbreak. And scientists say it will happen again.