How big can they get? What's the largest so far detected? Where does an 18 billion solar mass black hole hide? We've never seen them directly, yet we know they are there. Lurking within dense star clusters or wandering the dust lanes of the galaxy. Where they prey on stars. Or swallow planets whole....

Looking at the Earth from outer space you can see the amazing beauty of it's oceans and lakes, mountains and countryside, glaziers and coasts , pastures, desserts and fertile land. You can see the sun shining through giving energy to our natural resources. At night you can clearly see all the living...

On December 21, 2015, SpaceX landed back their space ship base component, saving millions of dollars for future missions. Elon Musk’s company released a new video of their recent reusable rocket landing at Cape Canaveral. It also announced that it will try once again to land the rocket on a sea bar

Nasa's asteroid Vesta in 3-D. Put on your 3-D glasses for this ride over asteroid Vesta.

A flurry of solar activity in early March dumped enough heat in Earth's upper atmosphere to power every residence in New York City for two years. The heat has since dissipated, but there's more to come as the solar cycle intensifies.

From 230 miles overhead, International Space Station external and crew-tended cameras captured video of the wildfires burning in central Texas to the southeast of the capitol of Austin at 12:07 p.m. Eastern time on Sept. 6, 2011. The video was accompanied by comments on the wildfires by Expedition 2...

Forty-five years ago, at 11:56 p.m. ET on July 20, 1969, Neil Armstrong became the first man to set foot on the moon. He said, "That's one small step for a man, one giant leap for mankind," and along with astronaut teammates Edwin "Buzz" Aldrin and Michael Collins, they helped change human history.

Launched on Feb. 11, 2010, the Solar Dynamics Observatory, or SDO, is the most advanced spacecraft ever designed to study the sun. On June 5 2012, SDO collected images of the rarest predictable solar event--the transit of Venus across the face of the sun. This event happens in pairs eight years apa...

Planetary Resources' mission is mine near-Earth asteroids for raw materials, ranging from water to precious metals. Through the development of cost-effective exploration technologies, the company is poised to initiate prospecting missions targeting resource-rich asteroids that are easily accessible....

The Giant Magellan Telescope (GMT) is slated to be the first in a new class of extremely large telescopes, capable of producing images with 10 times the clarity of those captured by the Hubble Space Telescope. The GMT aims to discover Earth-like planets around nearby stars and the tiny distortions t...