astronomy
Is 3I/ATLAS an interstellar comet or a 'hostile' alien spacecraft?
https://www.smh.com.au/interactive/2025/comet-3iatlas/
Added 1 week ago
How Big Can a Black Hole Get? | Scientific American
https://www.scientificamerican.com/article/how-big-can-a-black-hole-get/
Added 1 month ago