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A solid, rocky world 500 light-years away
This is the first time that the density has been measured for such a small exoplanet, and the measurements suggests a solid, rocky world.
September 16, 2009
Did small galaxies come together to make big galaxies?
Astronomers believe that it's from humble "building blocks" that mighty galaxies like our own Milky Way grew into giants.
September 16, 2009
Black hole, compact, dense, how do they form?
Cygnus X-1, an x-ray source, was one of the first black hole candidates to be discovered. It is thought to contain a black hole orbited by a bright, young star.
September 15, 2009
Can I see our galaxy from Earth?
On a very dark clear night - and if you look in the right direction - you can see a bright region of our own Milky Way galaxy.
September 15, 2009
Is red Antares bigger than our sun?
The ancients saw red Antares as the ruby Heart of the Scorpion in the constellation Scorpius. This star has since ballooned in size.
September 15, 2009
Ted Bergin: ‘Space clouds contain water enough to fill oceans’
Ted Bergin says Space clouds, many light-years in size, collapse to form stars and planets. Some may contain the building blocks of life.
September 14, 2009
Black hole at the center of our galaxy
Astronomers believe there's a supermassive black hole in the center of our Milky Way galaxy. The orbits of stars near the center reveal a huge amount of mass inside a very small volume.
September 14, 2009
Stars, how big can they get?
The theoretical size limit for the biggest stars keeps going up! We know of stars between between 60 and 100 times as massive as our sun.
September 9, 2009
Make a disco ball on the moon from lunar dust
The moon's lunar dust might contain mirror-building material and could be used to coat craters with mirrors making a disco ball.
July 23, 2009
Buzz Aldrin on his rocket experience
In the recent video, Buzz Aldrin declares, "I have only two passions: space exploration, and hip-hop." His hip-hop name? Doc Rendezvous.
July 21, 2009
