Comet 21P/Giacobini-Zinner came closer to Earth this week than it had in 72 years. Favorite photos here, from the EarthSky community. Plus info on comet Wirtanen, which might become visible to the eye alone later this year.
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Canopus: Sky’s 2nd-brightest star17 hours ago
Canopus: Sky’s 2nd-brightest star
See it! Photos of 2019’s biggest supermoon