Catch five naked-eye planets lined up in the morning sky on Friday The last time this rare, ordered planetary alignment occurred was way back in 2004. And it won't happen again for nearly 20 years.

The annual Lyrids Meteor Shower is set to light up the skies over the next week, as stargazers are encouraged to look up. This year, the meteor shower will take place between April 17 and April 26 ...

An app uses a smartphone camera to detect leukocoria, a pale reflection from the back of the eye. It can be an early sign of disease. Here it appears light brown compared the healthy eye.

A Close-Up View of the Black Eye Nestled within the northern constellation of Coma Berenices, approximately 17 million light-years away, the Black Eye Galaxy's dark-lidded appearance has earned it ...