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Submitted by Startrail_wanderer t3_zbfgd9 in space
Submitted by Andromeda321 t3_115jior in space
Gaia BH1. This discovery happened a few months ago ([press release if you missed it then](https://beta.nsf.gov/news/astronomers-discover-closest-black-hole-earth)), and that one happens to be the *closest* black hole to Earth that we know
Adeldor t1_jafswvk wrote
Reply to Satellite Constellations Are an Existential Threat for Astronomy by ChieftainMcLeland
observatories use sky-pointed lasers to create artificial stars for focussing and the like). [\[4\]](https://beta.nsf.gov/news/statement-nsf-astronomy-coordination-agreement) Meanwhile, professional and amateur astronomers both have tools now to deal with the existing satellites