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The planets are aligning. This Saturday is a rare chance to see several of our closest cosmic neighbors in a single sky. Six planets will assemble themselves for a spectacular “planetary parade” that ...

This is the “Exposed Cranium” nebula, also known as Nebula PMR 1. Located some 5,000 light-years away in the constellation Vela, it’s a massive, moribund star coming to the end of its fuel-burning ...

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If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...