The four laser beams excite sodium atoms in the atmosphere to make for better cosmic observations. The post Incredible photos ...

NASA astronaut Don Pettit captured this stunning long-exposure view of Earth and stars from space at night from the ...

The fundamental challenge in reaching a different star system ... told Space.com. "Energy is power [multiplied by] time — so to get a given amount of energy from a beam, you either need very ...

After one such explosion blows a star's outer layers into space, the core remains—but ... to blink on and off as the star spins, like the beam of light from a turning lighthouse.