NASA revealed seven Earth-Sized planets around a single star and this is the first time that scientists were able to find out bunch of Earth-Sized planets located in the habitable zone. NASA used its Spitzer Space Telescope which is a infrared space telescope to find out these Exoplanets.
This system of planets are relatively close us, just about 40 light years (235 trillion miles) in constellation "Aquarius". Scientist named this system of planet as "TRAPPIST-1" (Transiting Planets and Planetesimals Small Telescope).
Scientists have collected data from Spitzer to measure the size of the planets and then estimated there mass and density. Based on this analysis they estimated that planets are more likely to be rocky. The seventh planet's mass has not been calculated but it is considered to be icy. So there is high possibility that these planets may have water which sustains life. More research have to be done to confirm any life on those planets though.
Check out this video for more information Exoplanets
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