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This bottom portion of the rocket contains nine custom-built engines.which today is the equivalent of more than $3.

Credit: spacexReusable rocketry is a foundational reason why SpaceX has become one of the worlds top rocket companies.there may be comfort in knowing theres a way back home.Via GiphyBut SpaceX believes its greater ambitions -- to visit and set up shop in far-off parts of space like the moon and Mars -- also requires reusability.

Increasingly competitive pricing -- along with a reliable Falcon 9 rocket -- have made SpaceX an attractive rocket vendor to the likes of NASA.These spent rockets are destined to either become space debris or fall back through Earths atmosphere and burn up.

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Otherwise theyre one-way trips.SEE ALSO:Heres how NASAs TESS will hunt for alien planetsTESS plans to survey 85 percent of the sky.

com\/jw\/2017\/5\/c7d609f0-728b-d905\/uploaded_thumbnail.Ground and space-based telescopes -- such as the forthcoming James Webb Space Telescope -- will be able to check out the relatively nearby planets found by TESS.

playlistItemCallback = function (item.particularly those that have the potential for hosting alien life.