( CNN ) -- Black Friday bargain hunters , do you ever get the feeling that you 're being sucked in somewhere against your control , rapidly descending to a dark , cold place ? It could be that feeling after you snatch the last Xbox away from a 9-year-old . Or it could be a black hole . Shoppers may have Black Friday , but NASA scientists have something that 's arguably better : Black Hole Friday . NASA spent the day tweeting facts about black holes , including a handful of Black Friday-themed jokes . If humor is n't your thing , the agency also tweeted out a black hole-themed game . The space agency sent out over a dozen tweets and retweets on black holes . The `` 2-for-1 deal '' was a hit , garnering over 1,000 retweets . NASA defines a black hole as `` a place in space where gravity pulls so much that even light can not get out , '' where `` the gravity is so strong because matter has been squeezed into a tiny space . '' The space agency also posted some fun and less-known facts about black holes : For example , some scientists believe that the smallest black holes are the size of a single atom .
NASA has some fun with Black Friday on its Twitter account . The agency is offering a free trip to the International Space Station for anyone who tweets about #BlackFriday2015 or mentions @NASA.