Pictured: a "UFO" (Ultra-red Flattened Object) galaxy as seen in Hubble and Webb images. Emitting precious little visible light, UFOs are all but invisible in Hubble images.

UFOs: Astrophysicists Probe Mystery of Ultra-red Flattened Objects Published Nov 26, 2024 at 12:05 PM EST Updated Nov 27, 2024 at 5:07 AM EST By Ian Randall ...

These distant objects are very red, containing complex organic compounds like methane and methanol ice. These compounds, when viewed through a spectrograph, give an asteroid its reddish appearance.

An artist's concept of Arrokoth, a Kuiper Belt object visited by the New Horizons spacecraft in 2019. Scientists say two asteroids, 203 Pompeja and 269 Justitia, appear to have a similar color.