BAN #447: Wait. HOW MANY supernova explode every year? (badastronomy.beehiiv.com)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.
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Intrusive rock (Wikipedia)Intrusive rock is formed when magma penetrates existing rock, crystallizes, and solidifies underground to form intrusions, such as batholiths, dikes, sills, laccoliths, and volcanic necks.