NASA: Earth-sized planets outside solar system discovered

- NASA  announced Wednesday the discovery of the first known system of seven Earth-sized planets around a single star known as TRAPPIST-1

The seven worlds are orbiting the small, cool star some 40 light-years away.

All of the planets are similar to Earth in terms of mass and size.

Three of the planets reside in the “habitable zone” around their star.

According to NASA, liquid water may exist on their surfaces—though follow-up observations are needed to be sure.

"It is very promising for the search for life outside our solar system," said researcher Michael Gillon.

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