Science
Related: About this forumWell, hello! 4 Earth-sized planets found at nearest sunlike star (earthsky.org)
By Deborah Byrd in Space | August 10, 2017
The nearest sunlike star is Tau Ceti, only 12 light-years away. Its now known to have at least 4 planets orbiting it, with relatively small masses, tantalizingly close to Earths mass.
An international team of astronomers has discovered four Earth-sized planets orbiting the nearest sun-like star, Tau Ceti, only about 12 light-years away and visible to the unaided eye. They found the planets by observing tiny wobbles in the star as it appears in our sky, indicating the pull of gravity from unseen planets, and they hailed the discovery as an advance in the technology used to discover planets via this method. A paper describing these researchers study has been accepted for publication in the peer-reviewed Astrophysical Journal and is available online as of August 7, 2017. Coauthor Steven Vogt, professor of astronomy and astrophysics at UC Santa Cruz, commented:
We are now finally crossing a threshold where, through very sophisticated modeling of large combined data sets from multiple independent observers, we can disentangle the noise due to stellar surface activity from the very tiny signals generated by the gravitational tugs from Earth-sized orbiting planets.
Lead author Fabo Feng of the University of Hertfordshire, UK, said astronomers are getting tantalizingly close to being able to detect true Earth analogs, that is, a world like Earth, perhaps with oceans on its surface, perhaps even with life. He said:
Our detection of such weak wobbles is a milestone in the search for Earth analogs and the understanding of the Earths habitability through comparison with these analogs. We have introduced new methods to remove the noise in the data in order to reveal the weak planetary signals.
***
more: http://earthsky.org/space/4-exoplanets-tau-ceti-nearest-sunlike-star
rickford66
(5,530 posts)gtar100
(4,192 posts)How detailed does it get! The data we are getting is about things so incredibly small yet we are able to "see" so much. That amazes me.