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The space agency travels the universe in search of extraterrestrials and NASA scientists optimistically believe that every failed attempt brings them closer to the search for foreigners.
Missions like Kepler have discovered thousands of planets around the world. The Milky Way, however, is referred to as "NASA" as a "motley crowd: hot Jupiter, gaseous giants, small rocky worlds, and mysterious planets larger than Earth and smaller than Neptune."
The space agency says it is still searching for the elusive planet they are sure could shelter life.
And each step brings them closer together.
NASA said in a statement: "As we prepare to add thousands of other people among the thousands already found, research continues as a proof of life – and for a world similar to ours .
"Future space telescopes will be able to badyze the light of some of these planets in search of water or a mixture of gases in our own atmosphere.
"We will better understand surface temperatures.
"As we continue to check the elements of the habitability list, we are getting closer and closer to looking for a world with recognizable signs. of life. "
NASA thanks Europe for helping to narrow the search with the Gaia satellite of the European Space Agency (ESA).
Launched in July 2013, the satellite has already mapped 1.7 billion Milky Way.
It helped to reinforce NASA's Kepler telescope by encouraging a re-evaluation of stars to see if some might be larger, smaller, darker, or brighter than scientists had imagined.
brighter than previously thought, which would in turn mean that the planet discovered by Kepler orbiting around a larger star will also be bigger.
Eric Mamajek, Deputy Chief Program Scientist for the Exoplanet Exploratio of NASA's Program, said: "Gaia has improved distances and has improved the badessment of the brilliance and size of the planet of a star.
"The problem has always been this: up to how much do we understand the star? This is just another chapter of this ongoing story."
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