NASA Announces Discovery Of 7 Earth-Sized Planets, Some Could Be Habitable

Using the Spitzer Space Telescope, US space agency NASA has discovered seven new exoplanets 40 light years from Earth. Three of the planets are considered potentially habitable given they fall in the solar system's "Goldilocks zone."

This marks the first time a solar system with seven Earth-size planets has been found. The Trappist-1 group of planets is in Aquarius.

Each planet could potentially contain liquid surface water and they appear to be terrestrial planets like Earth.

If one of the three Goldilocks planets is shown to have oxygen, methane, ozone, and carbon dioxide in their atmosphere, life is likely present. Michael Gillon, lead investigator of the Trappist exoplanet survey, says those signs would "tell us there is life with 99 percent confidence."

The TRAPPIST-1 system provides one of the best opportunities in the next decade to study the atmospheres around Earth-size planets, - Nikole Lewis, astronomer, Space Telescope Science Institute