Astrophysicist and 'StarTalk' host Neil deGrasse Tyson uses the power of Twitter to answer some common questions about our universe. What is a quark? Is there a limit to the expansion of the universe?

Tune into 'StarTalk' airing Sundays at 11pm/10c on National Geographic.




Still haven’t subscribed to WIRED on YouTube? ►► http://wrd.cm/15fP7B7  
Get more incredible stories on science and tech with our daily newsletter: https://wrd.cm/DailyYT

Also, check out the free WIRED channel on Roku, Apple TV, Amazon Fire TV, and Android TV. Here you can find your favorite WIRED shows and new episodes of our latest hit series Tradecraft.

ABOUT WIRED
WIRED is where tomorrow is realized. Through thought-provoking stories and videos, WIRED explores the future of business, innovation, and culture.

Neil deGrasse Tyson Answers Science Questions From Twitter | Tech Support | WIRED