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Known as exoplanets, the first evidence was recorded as early as 1917, but the lack of knowledge about space means that the discovery was not noted as such and was forgotten for nearly a hundred years . The scientific definition was approved in 1988, but the first confirmed point did not occur before 1992. There are currently more than 4,000 confirmed exoplanets in 3,000 different solar systems.
NASA discovered the exoplanet L 98-59 just a few weeks ago on Twitter: "The smallest exoplanet!
"Our NASA Satellite Transiting Exoplanet Survey satellite mission has discovered a world smaller than the Earth and larger than Mars, gravitating around a bright, cool star located about 35 light-years from Earth."
The closest to Earth is Proxima Centauri B, located about 4.2 light-years away from its home, orbiting Proxima Centauri, the closest star to our Sun.
As reported by Cnet, discoveries after 1992 remained low until the Kepler Space Telescope was commissioned before its recent retreat.
READ MORE: NASA News: Astronaut takes stars on Earth from Space Station
NASA has now created a video visualizing the discovery of exoplanets.
The European Exoplanet Characterization Satellite (CHEOPS) and NASA's James Webb telescope are expected to come into action at the end of 2019 and 2021, in order to identify exoplanets and determine if they are capable of supporting life.
The exoplanets are all far away and the light takes 4.2 years to travel from Proxima Centauri to the Earth as it travels at an unimaginable speed of 300,000 km / s.
This means that the light can travel one meter (1.1 meters) in 1 / 299792458th of a second.
In addition to the exoplanets, there is another category of planets called rogue planets.
These planets do not revolve around a star but rather revolve around the center of the galaxy.
They are ejected from the planetary system or are never gravitationally attracted by a star. The Milky Way can contain billions.
It has been suggested that some of these celestial objects are formed in the same way as the stars.
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