Tag Archives: 1IOumuamua

3I/ATLAS, the third interstellar object making headlines today, is the oldest of the three. Kakharov and Loeb wrote in the paper that it has a median age of 4.6 billion years. It originated from the Milky Way’s thick disk, the region where older, lower metallicity stars reside. The researchers say that this shows that “ISOs are ejected from planetary systems …

In the past decade, astronomers have witnessed three interstellar objects (ISOs) passing through the Solar System. This included the enigmatic ‘Oumuamua in 2017, the interstellar comet 2I/Borisov in 2019, and 3I/ATLAS in July 2025. This latest object also appears to be a comet based on recent observations that showed it was actively releasing water vapor as it neared the Sun. …