3I/ATLAS (formerly known as A11pI3Z) is only the third interstellar visitor to be discovered, and astronomers can’t say yet whether it is a comet or a rocky body.

https://www.nytimes.com/2025/07/02/science/interstellar-object-a11pi3z.html?smid=url-share

This market will resolve to the classification assigned to 3I/ATLAS by the International Astronomical Union (IAU) or other authoritative scientific bodies. Possible classifications include:

The resolution will be based on official announcements from the IAU (likely through its Minor Planet Center), similar organizations, or a clear consensus across space agencies (NASA and ESA) and reputable news sources (NYT, ABC, Washington Post, AP, Reuters). Scientific articles (pre or post peer review) will be moderately weighted toward resolution in case of disagreement. 

3I/ATLAS is the third known interstellar object detected passing through our solar system, following 'Oumuamua in 2017 and Comet 2I/Borisov in 2019. Discovered on July 1, 2025, by the Asteroid Terrestrial-impact Last Alert System (ATLAS), it is currently near Jupiter and moving toward Mars. Its hyperbolic trajectory and high velocity suggest an origin outside our solar system. 