Astronomy

Water molecules have been detected on the surface of an asteroid for the first time, revealing new clues about the distribution of water in our solar system.

Scientists studied four silicate-rich asteroids using data gathered by the now-retired Stratospheric Observatory for Infrared Astronomy (SOFIA), a telescope-outfitted plane operated by NASA and the German Aerospace Center.

Observations by SOFIA's Faint Object InfraRed Camera (FORCAST) instrument showed that two of the asteroids — named Iris and Massalia — exhibit a specific wavelength of light that indicated the presence of water molecules at their surface, a new study reports.

In this map of a celestial hemisphere — compiled from data from the #eROSITA telescope — the colours reflect the wavelengths of X-rays. Hot gas haloes surrounding galaxy clusters have broad-band emissions (white), as do black holes (white dots); diffuse emissions have long wavelengths (red); and in the central regions of the Milky Way, dust blocks longer-wavelength emissions, so that only short-wavelength X-rays are visible (blue or black).

https://www.nature.com/articles/d41586-024-00489-8

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It’s a scenario made famous by the 1998 film ‘Armageddon’: an asteroid is spotted on a collision course with Earth, and experts scramble to plan a space mission to rendezvous with the asteroid and mitigate the danger. It’s classic science fiction, but did you know there is a very real group responsible for recommending such a response in real life? And it celebrates its tenth birthday this week.

A quasi-satellite of Venus has just received an unusual name.