Rogue planets are referred as nomads. These are sub-brown dwarfs in interstellar space which which range from three times the size of the Earth to 12 times the size of Jupiter. There are around 50 billion rogue planets, meandering around the Milky Way without any orbit. At times, these are even ejected out of the Milky Way. Most of the time rogue planets are muddled with the brown dwarfs, but the verity is that these aren’t brown dwarfs rather a sub brown dwarf which aren’t big enough to be an exactly brown dwarf, (13 to 80 times the size of the Jupiter, basically a failed star unable to achieve nuclear fusion of hydrogen to helium in their cores).
These rogue planets do not reflect light. Without light, astronomers face a tough time to spot these wandering celestial masses. Generally, microlensing is used to identify these planets. In 2011 in a survey by microlensing, an astounding observation was made which claimed that for every star there are two rogue planets. Five years later, another research claimed that there may be as many as one Jupiter sized rogue planets for every four planet in the galaxy.
How do Rogue Planets Come to be
There are many propositions which are competent enough to explain “how these rogue planets came into existence.” One of them is that when the two stars pass close to one another, their gravitational existence cause all sorts of mayhem. Planets may be kicked to higher or lower orbit or smashed into stars or flung out with an escape velocity. The second proposition states that when a star goes supernova, the force of explosion can eject planets at tremendous velocities chucking them out in the glorious hall of the galaxy.
Life on Rogue Planets
Numerous hypothesis support that rogue planets are somewhat capable of harboring life. All the rogue planets with hydrogen dominated atmosphere have the capacity to reserve heat, this sort of atmosphere can trap the planet’s heat through pressure induced far-infrared radiation fulfilling the heat requirement for the sustainability of life. Under some circumstance liquid oceans are also possible. These can be geologically active. The rogue planet OTS-44 is surrounded by atleast 10 Earths masses which arises the probability that they may have a set of moons around them. Our prevailing credentials of finding life on these planets doesn’t seem advantageous at all but NASA’s forthcoming Wide Field Infra Red Survey Telescope has raised our hopes substantially and is anticipated to amplify the search significantly.