Big discovery! NASA’s Spitzer Space Telescope has revealed 7 Earth-sized planets orbiting a tiny star only 40 light-years away. Three of them are firmly in the habitable zone.

At a news conference in Washington D.C. today (February 22, 2017), NASA announced that itsSpitzer Space Telescope has observed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in what’s called the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water – key to life as we know it. The discovery sets a new record for greatest number of known planets in a star’s habitable zone. After all, our solar system has only two planets in the habitable zone: Earth and Mars. This exoplanet system – called TRAPPIST-1 – has three.

Because they are located outside of our solar system, these planets are scientifically known as exoplanets.
 

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