Even the best telescopes can’t see exoplanets. It’s all about watching for jiggly stars, blue shifts, and transits.

The giant planets weren't always where we find them today. Jupiter, Saturn, Uranus and Neptune formed in a more compact ...

The cold and remote planets originally earned their label of "ice giants" to contrast their interiors from those of Jupiter ...

A vast ring of rocky leftovers between Mars and Jupiter, the asteroid belt preserves clues to how the planets — and Earth ...

Rocky planets like our Earth may be far more common than previously thought, according to new research published in the ...

Astronomers are uncovering distant worlds beyond our solar system using ingenious indirect methods like observing stellar ...

Astronomers at the University of California, Santa Cruz, and UCLA will develop a next-generation instrument for detecting and ...

An ultra-hot rocky exoplanet may be wrapped in a dense atmosphere, defying expectations about what small planets can sustain.

Interstellar comet 3I/ATLAS makes its closest Earth approach on Dec. 19, offering astronomers a rare chance to study a visitor from beyond the solar system ...

Hot Jupiters were once cosmic oddities, but unraveling how they moved so close to their stars has remained a stubborn mystery ...

Scorching planets that should be bone-dry may actually create their own water deep inside, forging oceans through molten rock ...

Still, science being science, we needed proof—and we got it in 1992, when two astronomers found two planets orbiting a pulsar ...