Editor's note: This article was updated March 25 at 11:40 a.m. ET to account for the recent discovery of new moons around Saturn and Jupiter. The total number of planetary moons and small-body ...

NASA's Nancy Grace Roman Space Telescope is poised to make a major leap in the hunt for worlds outside our solar system, ...

NASA Psyche spacecraft Mars images from the May 15 gravity-assist flyby are now fully released, confirming all four science ...

A trio of planets stand in line in the evening sky after sunset: Jupiter, Venus, and Mercury, all visible in the twilit sky.

A new analysis of NASA's Deep Space Network finds Earth's strongest radio beams align with planetary line‑ups, boosting the chance alien civilisations could detect us and suggesting where and when we ...

The Psyche mission, launched in October 2023, is heading for Asteroid 16 Psyche in the outer part of the main asteroid belt, ...

Despite being the closest planet to the sun, Mercury has thick deposits of ice at its poles, and now we may understand the events that formed them over just one Mercurian day ...

Scientists have discovered a bizarre planetary system where a rocky world orbits farther out than giant gas planets, defying ...

Over billions of years, a planet will have encountered all the small bodies in its vicinity enough times to clear its orbit of them.

NASA’s Psyche spacecraft successfully completed a flyby of the Red Planet on May 15, coming within 2,864 miles (4,609 ...

Neptune has only been visited by one spacecraft, NASA’s Voyager 2 in 1989. Nereid was discovered 40 years earlier by Dutch ...