Solar system

Atmosphere detected on celestial body in solar system's far reaches

Astronomers have identified another object from this realm, with a diameter of roughly 310 miles (500 km), that has an atmosphere - albeit a thin one.

|ByREUTERS
An artist's concept of a dwarf planet.
A reddish rock nicknamed "Cheyava Falls", with features resembling leopard spots was discovered by NASA's Perseverance rover in Mars’ Jezero Crater in July 2024, in this handout photograph released on September 10, 2025

Life on Mars? NASA rover finds potential sign of ancient alien life in Martian rocks

The discovery in Jezero Crater represents one of the best pieces of evidence to date about the possibility that Earth's planetary neighbor once harbored life.

|ByREUTERS
This image of interstellar comet 3I/ATLAS was captured by the Hubble Space Telescope’s Wide Field Camera, July 21, 2025.

A new guest in the cosmic neighborhood: The possible extraterrestrial origins of 3I/ATLAS

Is 3I/ATLAS an alien space probe? An irregular comet? Debate rages around status of 3rd interstellar object ever spotted. Harvard astrophysicist Avi Loeb discusses implications with ‘Magazine.'

|ByAARON REICH