Scientists on the International Space Station have proven (by placing samples outside the ISS) that bacteria can survive at least 3 years in the cold vacuum of space, giving support to the panspermia theory. 3 years was the longest time tested so far and the bacteria is still alive. User digdeeper5, in the Interesting As Fuck subreddit, 20 Jun 2022
TIL Deinococcus radiodurans- World's toughest known bacterium as listed in Guinness Book (Polyextremophile - survives cold, dehydration, radiation, vacuum User Xenomorph007, in the Today I Learned (TIL) subreddit, 17 Jan 2021
DNA Damage and Survival Time Course of Deinococcal Cell Pellets During 3 Years of Exposure to Outer Space User gepr, in the Arbitrary comments on anything of interest. subreddit, 26 Aug 2020
Bacteria From Earth Can Survive In Space And Could Endure The Trip To Mars, According To New Study User auscrisos, in the Reddit Science subreddit, 26 Aug 2020