As the United States prepares to celebrate its 250th anniversary, the history of the solar system tells its own story of ...

A Jupiter-size exoplanet orbiting a dead star baffled astronomers. But the planet named WD 1856 b could preview the fate of ...

Snapchat Planets turns your friendship ranking into a tiny social solar system, where being Mercury is elite and Neptune ...

Two massive planets may have once existed in early solar system before being ejected, leaving behind evidence in unusual ...

So far, humanity has yet to find its first "exomoon"—a moon orbiting a planet outside of the solar system. But that hasn't been for lack of trying. According to a new paper by Thomas Winterhalder of ...

Astronomers have uncovered a pair of giant planets that are lighter than cotton candy—super-puffs the size of Jupiter.

Nearly all of the planets in the solar system are about to march through the night sky in a single-file line. This planetary alignment, sometimes called a planet parade, will include all of the solar ...

NASA already flies two famous space telescopes, Hubble and James Webb. A third is almost ready: the Nancy Grace Roman Space ...

A pair of sibling gas giants originally spotted by citizen scientists are so lightweight that their density resembles wispy ...

Extra-solar planets are among the most thrilling discoveries of our age. Just today, scientists using Spitzer space telescope data announced the first detection of infrared light from an extra-solar ...

The planet should not have survived the star's red giant phase—which sees a star balloon to more than 100 times its original ...

Venus, Jupiter and Mercury are due to form a planet parade in June visible across the US. What to know, including the date and time and where to look.