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Known Unknowns

In Pseudoscience by Brian Koberlein1 Comment

The image above is a planetary nebula known as M2-9. It’s also known as the Butterfly nebula, but there are lots of other nebulae by that name. Planetary nebulae occur when red giant stars cast off their outer layers as they begin a transition toward becoming a white dwarf. The cast off material is caused to glow when the exposed interior of …