Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...

The most important aspect of this is that, with a possible atmosphere and liquid water, this planet lies within the habitable ...

Two of NASA’s longest-running space missions, Voyager 1 and Voyager 2, have detected a searing-hot region of space where the ...

Editorial: Over the holiday period, the Guardian leader column is looking ahead at the themes of 2026. Today we look skyward, where a new lunar contest mirrors humanity’s struggle to live within plane ...

James Webb observations detect warm carbon monoxide gas in the inner disk of HD 131488, revealing non-equilibrium conditions and evidence of exocomet-driven gas replenishment near the star.

From new exoplanetary neighbors and a weakening dark energy to the best evidence for life on Mars and an interstellar comet ...

Across the Milky Way and beyond, planetary systems appear to fall into a few recurring blueprints, and recent exoplanet ...

A Carnegie-led team of astronomers detected the strongest evidence yet of an atmosphere around a rocky planet beyond our ...

Saturn and Neptune will be in the same binocular view for the entire month. Neptune lies 3.5 degrees northeast of Saturn on ...

The moon and sun share top billing in 2026. Kicking off the year’s cosmic wonders is the moon, drawing the first astronauts ...