This week, an old astronomical controversy is renewed as researchers present new evidence for a hidden "Planet X" in our solar system.

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...

The knock-on changes from a super-Earth – dubbed Phaeton by the researchers – were intriguing. "If it's one or two Earth masses, which is still a pretty big planet, our inner Solar System ...

Apr. 15, 2025 — A new study modeled the chemistry of TOI-270 d, an exoplanet between Earth and Neptune in ... types of planets outside of our solar system, according to a new ...

Kosmos-482, a spacecraft bound for Venus in 1972, was a time capsule from the Cold War when superpowers had broad ambitions ...

Our solar system consists of four small, rocky, inner planets (Mercury, Venus, Earth and Mars ... Astrophysical Observatory, which is part of the CfA. "This result suggests that in Jupiter ...

Aisling O'Hare, who led the study, told Newsweek she's "excited" about what the science world can learn from the data.

Sporadic E layers lit up during a solar storm, moving from poles to equator—surprising researchers and revealing potential communication threats.

LONDON — Astronomers have found possible chemical signs of life on a distant planet outside our solar system, though they ... s atmosphere that on Earth are only produced by living organisms ...

Video illustration released on April 17, 2025, shows the K2-18b super-Earth, a hycean world in which astronomers say they have found the strongest yet ‘hints’ of life outside the solar system.