At a Glance According to astrophysicist Ethan Siegel, the sun is ever-so-gradually getting lighter and expanding into a red gas giant.Eventually it will burn so hot that it will boil Earth's seas away.That won't happen for at least a billion years, however. Before the sun dies in about 10 billion years, its decreasing mass will make the star hotter and hotter, eventually boiling Earth's seas away, a scientist said. Astrophysicist Ethan Siegel wrote in an article for Forbes this week...

Astronomers may have discovered the first moon outside our solar system, about 8,000 light years away from Earth. ...

Jon Carmichael's eclipse masterpiece, 108. (Jon Carmichael) At a Glance Photographer Jon Carmichael took 1,200 photos in three minutes.His eclipse mosaic is the product of hundreds of hours of work.After a year of work, it was unveiled at Twitter's New York offices. Some are calling this photographer's eclipse photo the best of all time — and he took it from his window seat on a commercial flight. The photograph, called108, is a mosaic, a year-long synthesis of 1,200 photos taken...