Wait. HOW MANY supernova explode every year?

BAN #447: Wait. HOW MANY supernova explode every year? 25 July 2022 Issue #447 Blog Jam [Of course I picked this one to highlight because the title made me laugh. From Tuesday’s article. Credit: S. Safi-Harb et al (2022)] Monday 18 July, 2022: How is Canada like Mars? Lost Hammer Spring shows us Friday 22 July, 2022: Blue blobs turn out to be orphan star clusters made of gas cast-off from galaxies Astro Tidbit A brief synopsis of some interesting astronomy/science news I recently wrote about the Cartwheel galaxy, a weird ring-shaped galaxy that suffered a massive collision that gave it its distinctive shape. I also mentioned it had a supernova in it, called SN2021 afdx. And I have to say, when I first saw that designation I actually muttered an obscenity or two under my breath. Why? Because it’s all in the name. The Cartwheel galaxy, seen in 2014 (left) and 2021 (right). Can you spot Supernova 2021 axdf? Credit: ESO/Inserra et al., Amram et al. Way back when, supernovae — ex ... Read full article.