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One year ago, we discovered Neptune.
One Neptunian year, that is. See, it takes Neptune 164.79 years to go around the Sun, and it’s been that long since it was discovered - on September 23, 1846.
(via The Observer)
Happy Winter Solstice, Northern Hemisphere! :)
Six hundred and fifty light-years away in the constellation Aquarius, a dead star about the size of Earth, is refusing to fade away peacefully. In death, it is spewing out massive amounts of hot gas and intense ultraviolet radiation, creating a spectacular object called a “planetary nebula.” The composite picture is made up of visible data from Hubble and infrared data from Spitzer.
Astronomers using NASA’s Chandra X-ray Observatory have found, for the first time, sound waves from a supermassive black hole. The “note” is the deepest ever detected from any object in our Universe. The tremendous amounts of energy carried by these sound waves may solve a longstanding problem in astrophysics.
The black hole resides in the Perseus cluster of galaxies located 250 million light years from Earth. In 2002, astronomers obtained a deep Chandra observation that shows ripples in the gas filling the cluster. These ripples are evidence for sound waves that have traveled hundreds of thousands of light years away from the cluster’s central black hole.