Astronomers identify five potential planets orbiting Tau Ceti
Posted: Fri, Dec 21, 2012, 11:33 AM ET (1633 GMT)
Astronomers announced this week the discovery of up to five extrasolar planets orbiting the nearby star Tau Ceti, including one that is potentially habitable. Astronomers identified the five planets in radial velocity observations of the star taken at the European Southern Observatory in Chile as well as at the Anglo-Australian Telescope in Australia and the Keck Observatory in Hawaii. The five planets have orbital periods ranging from 14 to 640 days and masses of 2 to 6.6 times that of the Earth. One planet, with a minimum mass of 4.3 times the Earth and a period of 168 days, lies in the star's habitable zone; some argue the the outermost planet may also be habitable. Tau Ceti is a Sun-like star about 12 light-years from the Earth. Some astronomers are skeptical of the finding, noting that the periodic shifts seen in spectral features could be explained by stellar activity or may be noise.
Astronomers announced this week the discovery of up to five extrasolar planets orbiting the nearby star Tau Ceti, including one that is potentially habitable. Astronomers identified the five planets in radial velocity observations of the star taken at the European Southern Observatory in Chile as well as at the Anglo-Australian Telescope in Australia and the Keck Observatory in Hawaii. The five planets have orbital periods ranging from 14 to 640 days and masses of 2 to 6.6 times that of the Earth. One planet, with a minimum mass of 4.3 times the Earth and a period of 168 days, lies in the star's habitable zone; some argue the the outermost planet may also be habitable. Tau Ceti is a Sun-like star about 12 light-years from the Earth. Some astronomers are skeptical of the finding, noting that the periodic shifts seen in spectral features could be explained by stellar activity or may be noise.
Related Links:
| <<previous article | next article>> |
|
news in brief
|
|
|
|
news links
|
|
Thursday, October 30
First UK phones to get satellite connectivity in signal blackspots announced
BBC — 7:12 am ET (1112 GMT) First UK mobile network to use Musk’s Starlink for rural coverage
The Independent — 7:11 am ET (1111 GMT) Colorado files suit against Trump administration to stop Space Command move to Alabama
AL.com — 7:10 am ET (1110 GMT) Colorado sues Trump Administration over Space Command move
Colorado Public Radio — 7:08 am ET (1108 GMT) Colorado Attorney General Phil Weiser sues Trump administration over plans to move U.S. Space Command
CBS — 7:08 am ET (1108 GMT) |
