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    After debunking Trump denialism, Neil deGrasse Tyson tackles 'unexplained' flying objects

    11:30

  • Astronomers reveal first image of supermassive black hole at Milky Way’s center

    02:13

  • Russian invasion of Ukraine could infringe on space program's neutrality

    01:37

  • Scientists hold their breath as James Webb Space Telescope deploys with high hopes

    04:37

  • NASA launches James Webb Space Telescope into orbit

    01:10

  • Jeff Bezos's Blue Origin launches third human spaceflight aboard New Shepard

    02:42

  • How one man went from NASA to novelist

    06:26

  • Scientists hope rocket crash offers insight on protecting Earth from asteroid collision

    05:49

  • Dead satellites and space junk plague low-Earth orbit

    01:41

  • Reckless Russia imperils space station with debris from satellite missile strike test

    01:47

  • Russia missile test blamed for space debris that forced astronauts to take shelter

    03:39

  • Retired astronaut Chris Hadfield discusses new book

    05:39

  • 'It's extraordinary': William Shatner grows emotional describing experience on Blue Origin flight

    05:02

  • William Shatner and Blue Origin crew lifts off from Texas

    03:47

  • Inside Blue Origin: What William Shatner will experience before, during his '3 minutes of fun'

    02:49

  • Watch: All-civilian SpaceX flight splashes down off Florida after three days in orbit

    04:13

  • Walter Isaacson: Space travel 'not just a billionaires boys club' now

    04:53

  • SpaceX makes history launching all-civilian crew into orbit

    04:00

  • Watch SpaceX rocket launch first all-civilian crew into orbit

    06:00

  • Former NASA administrator explains what Inspiration4 crew training may have looked like

    04:17

NOW With Alex Wagner

Will humans soon set foot on Mars?

05:44

Retired shuttle commander Capt. Mark Kelly and Mars One finalists Dr. Leila Rowland Zucker and H. Peter Felgentreff join to talk about the ambitious Mars One project, and what the future holds for humankind in space.Feb. 20, 2015

  • UP NEXT

    After debunking Trump denialism, Neil deGrasse Tyson tackles 'unexplained' flying objects

    11:30

  • Astronomers reveal first image of supermassive black hole at Milky Way’s center

    02:13

  • Russian invasion of Ukraine could infringe on space program's neutrality

    01:37

  • Scientists hold their breath as James Webb Space Telescope deploys with high hopes

    04:37

  • NASA launches James Webb Space Telescope into orbit

    01:10

  • Jeff Bezos's Blue Origin launches third human spaceflight aboard New Shepard

    02:42

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