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Spotted: Neil deGrasse Tyson and Web Series ArchivesGrover from Sesame Street hanging out at SXSW.

What in the WORLD??!

The astrophysicist wore his best shade of blue to the final day of "The Mashable Show" to answer some questions about the universe from the lovable friend of Cookie Monster and Bert.

Grover got right to it, asking Tyson the question on basically everyone's mind --what exactly is it that an astrophysicist does?

Tyson explained that his job is to look at how nature reveals itself to us on Earth, and "ask if that applies to other planets, stars, and galaxies across space and time."

The two had a lovely chat about the laws of physics and the striking resemblance Grover's mouth bears to a black hole, before Tyson dropped some serious knowledge about life on other planets and former planet, Pluto.

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Relive the glorious meeting above, and check out Day Three of "The Mashable Show" on Twitter to see our other fabulous guests like Adrian Grenier, Brooklyn Decker, Cenk Uygur, Mamrie Hart, Hannah Hart and more.

The Mashable Show at SXSW 2017

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