Astronomers have observed an object like ‘Oumuamua — but unlike the first known interstellar visitor, this one is in the solar system.
A new study estimates the number of interstellar objects that fly through the inner solar system every year, and it could be quite a lot.
A new study suggests that ‘Oumuamua’s strange trajectory back out to interstellar space can be explained if the object had the density of air.
Astronomers think a jet-powered rocking motion could solve the puzzle.
The arrival of an object from beyond the solar system caught astronomers by surprise — but that doesn't mean that they were unprepared to study it.