Let's start with the human eye. The human eye has an angular resolution of about 1 arcminute. That's pretty impressive. Take a circle surrounding you on the horizon, divide it into 360 little bits, ...

April 21 is a date rich with historical significance, marked by events that have shaped cultures, nations, and the course of ...

On Wednesday, the Event Horizon Telescope released the first-ever image of a black hole, a historic moment shared by scientists spread around the world. WATCH: What does a black hole look like?

The Event Horizon Telescope is expected to release the first image of a black hole on Wednesday. In preparation for what might be a momentous day, here’s what you need to know.

The moon and two planets will align on Friday, April 25 to form a celestial "smiley face". Here's when Tennesseans need to ...

The celestial event will be visible from anywhere in the world with clear skies, but the window to ...

A rare alignment of the moon and three planets will give millions a reason to look up — and the view could leave stargazers ...

In a rare and fleeting display early this morning, the skies offered a delightful surprise — a celestial ‘smiley face’ formed ...