1 00:00:00,000 --> 00:00:06,750 ♪ So now that you've learned all about big black holes, and small black holes, and social black holes, and not-so-social ones, 2 00:00:06,750 --> 00:00:09,083 you're probably wondering, "What's left?" 3 00:00:09,083 --> 00:00:14,250 Well, while we've talked a lot about COMMON black hole situations, there are always records to be broken! 4 00:00:14,250 --> 00:00:19,750 For example, the biggest black hole we know of is truly massive, being 40 billion times the mass of the Sun, 5 00:00:19,750 --> 00:00:23,333 and the smallest one could be only two and a half times the Sun’s mass. 6 00:00:23,333 --> 00:00:28,583 There's even a “spinniest” black hole that spins at over 1,000 times per second. Adorable! 7 00:00:28,583 --> 00:00:33,416 Next, depending on what planet you're from, there are also "closest" and "farthest" to think about. 8 00:00:33,416 --> 00:00:38,666 For example, if you live on Earth, the closest known black hole is about 3,000 light-years away. 9 00:00:38,666 --> 00:00:43,166 On the other hand, the farthest known black hole is about 13 billion light years away. 10 00:00:43,166 --> 00:00:48,000 Although, um, what that really means is that light from near that black hole took 13 billion years to reach us, 11 00:00:48,000 --> 00:00:54,000 and because the universe is constantly expanding ... that means now it’s ... um … well, it, um ... 12 00:00:54,000 --> 00:00:57,333 In any case, it’s still "farthest known." Let's move on! 13 00:00:57,333 --> 00:01:03,416 If you're feeling more adventurous, there are also some rarer black holes to be found – assuming some of them even exist, that is! 14 00:01:03,416 --> 00:01:09,666 For example, while we do know about small and big black holes, we’ve only found a few that that fit ... somewhere in between. 15 00:01:09,666 --> 00:01:16,416 It's also possible that tiny black holes may have formed back at the beginning of the universe when everything was just really packed together. 16 00:01:16,416 --> 00:01:20,583 However, even if they did exist, we definitely haven’t detected them yet. 17 00:01:20,583 --> 00:01:26,833 And finally, we'd love to catch two giant black holes crashing into each other because, well, we just haven’t seen that yet! 18 00:01:26,833 --> 00:01:31,083 So, if extreme adventures and rare finds are on the top of your black hole-watching list, 19 00:01:31,083 --> 00:01:34,916 grab your rocket ship – or your favorite observatory ­ and start searching! 20 00:01:34,916 --> 00:01:37,166 ♪ 21 00:01:37,166 --> 00:01:46,833 [silence]