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Perhaps some world with liquid water on its surface exists not far from our own home planet.TESS! Our favorite new NASA mission -- called TESS.

meaning that it will detect small dips in a stars light that occur when a planet passes across the face of its star from TESSs perspective.Most of the worlds that Kepler found circle stars that are exceedingly far from our own.but TESS is designed to find worlds in our cosmic backyard by comparison.

space and science stories?Sign up for Mashables weekly Light Speed newsletter.exoplanet scientist at Cornell University.

Thats why TESS is so important: it will find exoplanets around stars in our cosmic backyard.

com\/jw\/2017\/5\/c7d609f0-728b-d905\/mp4\/480.it would be great if you can come back.

it would also likely be prohibitively expensive to manufacture a new rocket.If you go to Mars and dont like it.

SpaceX regularly brings its rockets safely back to Earth.com\/cms\/2018\/3\/256bc4e6-c329-d6a6\/mp4\/480.