Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

Six planets will all be visible at once in the night sky this month, lined up across the sky—but one is set to disappear from view.

Venus and Saturn will be in conjunction this weekend, appearing side by side in the night sky during January's post-sunset ...

Research and development is underway to create robots that can hunt for signs of life in the vast oceans that exist under the ...

As soon as it gets dark, two bright lights become visible—the brightest in the southwest and an almost-as-bright light in the ...