however, to these Roasters, Eccentric Giants and Transitters, a
planet orbiting the star Mu Arae, and two others reported at about
the same time in 2004, are smaller than their predecessors and could
be made largely of rock ( although much larger than Gliese 581).
The planet around Mu Arae weighs at least
14 times as much as the Earth and is scorchingly close to its star,
completing an orbit every 9.5 days.
In 2005, a ‘super-Earth’ was
found orbiting Gliese 876, 15 light years away in the constellation
Aquarius. It has about a third the Sun’s mass, and has two
Jupiter-size worlds orbiting it. At the time it was the smallest
star known to have planets.