Another #spaceisweird all about how we think the Cartwheel Galaxy formed - similar to Hoag's Object it has a ring but also these strange spokes going from the middle to the ring that we can't quite explain with the usual collision of two galaxies idea... Oh and somehow we end up talking about Intermedia Mass Black Holes because the Cartwheel galaxy is an excellent place to look for them. I don't mean for all my videos to end up talking about black holes you know but they're JUST. SO. COOL. --- Prestwich et al. (2012) - https://arxiv.org/pdf/1212.1124.pdf PIzzolato et al. (2010) - https://academic.oup.com/mnras/article/406/2/1116/1000818 Zwart & McMillan (2002) - https://arxiv.org/pdf/astro-ph/0201055.pdf More on primordial intermediate black holes from Clesse & García-Bellido: https://arxiv.org/abs/1501.07565 --- My new book 'Space: The 10 Things You Should Know' is coming out September 5th in the UK! You can pre-order it from amazon here (UK only; more details to follow on worldwide release dates): http://bit.ly/SpaceDrBecky ----------- Follow me on Twitter: https://twitter.com/drbecky_ And on Instagram: https://www.instagram.com/drbecky_s/ Don't forget to subscribe and click the little bell icon to be notified when I post a new video! ----------- My sister made the frame in the background as a present when I passed my PhD. It's not a real certificate. It's a decorative frame in my office which I love. My sister does commissions: https://megansmethurstdesign.wordpress.com/work/ We're moving house soon so I'm hoping to get more prints to decorate my new office! ------- Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford. http://drbecky.uk.com/