| Earth (590) |  |
| Jupiter (39) | |
| Mars (350) | |
| Neptune (10) | |
| Saturn (10) | |
more Neptune-scale planets,#says Mountain. The telescope will aim to find out whether these extra-solar worlds are so-called"super-Earths##rocky planets that could potentially be habitable#or miniature versions of Neptune,
unable to support life. Using an instrument called a coronagraph, JWST will try to determine
to determine whether they are super-earths or micro-Neptunes.""The big ground-based telescopes can work with it
because its mass is intermediate between those of Earth and Neptune. Recent searches for planets around other stars (xoplanets have shown that super-Earths like GJ 1214b are among the most common type of planets in the Milky way galaxy.
It has a radius slightly more than double that of Earth's a size that led astronomers to assume it was a shrunken version of gassy planet Neptune
more or less the same mass as Neptune. But because Kepler-10c is much smaller then Neptune it must be an incredibly dense rocky world the like
of which has never been seen before. All the major existing planetary formation models were not predicting this type of planet
which are bigger than our home world but much lighter than Neptune. It is made probably from the same materials as Earth water silicates
At about the distance of the Kuiper belt the region past Neptune where comets are born the would-be planet cores can't get much bigger than a millimetre.
"And more data from the European space agency's Herschel Space observatory reveal that 51 Eridani is surrounded also by a more distant and colder cometary belt, much like the Kuiper belt of comets beyond Neptune in the Solar system."
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