Super-Earth

Super-Earth, also known as superterran planet or themian planet, is a classification of with mass ranging from 2 to 10 es or 0.0063 to 0.0315 es. Hence it is the fifth most massive mass class of planet, super-Earth is rated M-Class V and has the symbol Ea.

Characteristics
Some super-Earths have surface like Earth, and some are  or  like  and. Deep s (with oceans hundreds or thousands of miles deep) would also be a common property of super-Earths.

Super-Earths tend to be more geologically active than Earth's, making such worlds more active but prohibiting  due to stronger s in their mantles owing to their stronger gravity, making the surfaces too strong for  to break into plates. Also because those planets tend to have gravity two or three times stronger than Earth's prohibiting plate tectonics, mountains would be rare on super-Earths with elevations no more than a mile high.

Habitability and life
The habitability of super-Earths depend on if it's rocky or gaseous. If it's rocky, it would typically have very thick atmosphere, perhaps ten times thicker than it is on Earth for super-Earths in the. Because of the stronger gravitational pull of super-Earths (perhaps two to three times stronger than Earth's) than lower mass planets, creatures would not grow and develop as effeciently as those on Earth. But because of their thicker atmospheres, there may be floating lifeforms, such as "balloon gondolas."

If it is an, every lifeforms are aquatic with no aerial lifeforms unless if organisms can both swim and fly, so-called "aquaerial life." There might even be covering large areas of the ocean, perhaps as large as continents on Earth. So would be a dominant form of life on ocean planets but no s, unless if there is a creature called birdfish, an aquaerial organism.

Abundance
There are an estimated 155 billion super-Earths in alone, making it the third most abundant mass class of planet after mid-Earth and sub-Earth. This corresponds that 189‰ of all 820 billion planets in our galaxy are super-Earths.

Known super-Earths
There are no super-Earths in our, but there are more than 400 such planets known around other stars as of 2015. The first super-Earth discovered was Ixion (Ixion) on January 22, 1992, together with the other super-Earth in that planetary system orbiting around the. The first super-Earth around the normal star would not be discovered until 2004, when (Euippe) was found. The second super-Earth found was (Ilus). The first super-Earth in the habitable zone was (Themis). Other examples of super-Earths are (Icarus),  (Shesha), and  (Poseidon), one of five known super-Earths around. has found hundreds of super-Earths, including the s (Gayatri),  (Likho),, , and. (Cresphontes) is the most Earth-like planet known that was not observed by Kepler.

Related links

 * –– more details about this planetary class on Wikipedia