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Posts by
Editors of EarthSky
Is there a pulsar at the center of our galaxy?
There appears to be a pulsar - a rapidly spinning dead star - located about a light-year from the black-hole center of our galaxy.
September 23, 2009
GD 50, a runaway star, maybe from Pleiades
GD 50 was born in the Pleiades star cluster, then was flung out, possibly after passing too close to another star.
September 17, 2009
Do plants grow as well under artificial light?
There are some differences between sunlight and artificial light - most artificial light doesn't emit as much energy in the red and blue region of the light spectrum as sunlight does.
September 17, 2009
What are the birthstones for each month?
Birthstones are special stones associated with each month of the year. They have a place in history, mythology and science. Check out the special story of your birthstone.
September 16, 2009
Copper, where does it come from?
Astronomers use computers to study stars in the Milky Way and in a star cluster called Omega Centauri to learn more about the origin of copper.
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
How can some fish change from female to male?
Parrotfish an anemonefish can live for a while as male fish or female - but different hormones kick in and cause it to change.
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
