Star system has record eight exoplanets | 2017-12-15 |

Star system has record eight exoplanets

Sun Online Desk     15th December, 2017 08:19:02 printer

Star system has record eight exoplanets



Nasa has found a distant star circled by eight planets, equal to the complement in our own Solar System.


It's the largest number of worlds ever discovered in a planetary system outside our own.


The star known as Kepler-90, is just a bit hotter and larger than the Sun; astronomers already knew of seven planets around it.


The newly discovered world is small enough to be rocky, according to scientists.


"This makes Kepler-90 the first star to host as many planets as our own Solar System," said Christopher Shallue, a software engineer at Google, which contributed to the discovery.


The discovery was based on observations gathered by Nasa's Kepler Space Telescope.


Its parent star is very distant, lying 2,545 light-years away. But its planetary system appears to be ordered in a similar way to our own.


To give a sense of how close, the outermost planet in the system orbits at around the same distance the Earth does from the Sun.


Because the new world, dubbed Kepler-90i, is so much further in - it completes one circuit of its star every 14.4 days - it's estimated to have a scorching hot surface temperature of around 425C.


The machine learning technique was also used to find a new Earth-sized planet, called Kepler 80g, around a different star.


Some 3,500 exoplanets - worlds circling other stars - have been documented in recent decades, reports BBC.