Long before 3I/ATLAS slipped through the inner solar system, its water had already recorded the kind of place it came from.
In the far reaches of our solar system — beyond the outermost planet Neptune — resides a host of icy and desolate celestial ...
The water ice locked inside interstellar comet 3I/ATLAS condensed at temperatures below minus 400 degrees Fahrenheit, ...
Astronomers have confirmed, for the first time, a trans-Neptunian object with a thin atmosphere—something previously thought ...