Anyone who grew up learning that our solar system has nine planets probably remembers the moment Pluto got demoted. That ...

A new study published in The Astrophysical Journal Letters suggests that the outer solar system could become dynamically unstable about one billion years after the Sun becomes a white dwarf, ...

Astronomer Bob Donahue will discuss how the definition of a planet has changed, including the roles of Pluto, dwarf planets ...

Thousands of exoplanets have been discovered in recent decades, yet Earth remains the only known world with life.

Orbital weapons have implications for both space junk and diplomacy. From what kind of weapon this might be to its implications for space junk, the announcement that the U.S. military has weapons in ...

Deep inside the caves of Gabon, a pioneering researcher is discovering how these cryptic carnivores push the limits of adaptation. Conservation ecologist Matt Shirley studies how the African dwarf ...

Suzie Dills of the McKinley Museum's Planetarium wistfully remembers the day Pluto was dropped to a dwarf planet status.

In a new study, astronomers detail observations of what could be the first known exosatellite - a natural object orbiting a ...

The BepiColombo mission, by the European Space Agency and the Japan Aerospace Exploration Agency, is only the third to study our smallest planetary neighbor ...

For 76 years, generations of students learned that our solar system had nine planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Now, in 2026, some still can't get over ...

This week’s science story collection begins with a spectacular consequence of the “super” El Niño and ends with a study that ...

What: A SETI Live conversation about whether planet-mass objects could form in the dusty outer regions surrounding actively feeding supermassive black holes; Guests: ...