Using NASA's planet-hunting spacecraft TESS (Transiting Exoplanet Survey Satellite), astronomers have discovered three ...

For almost a decade, astronomers have been searching for a ninth planet in the solar system. Recently, new evidence of ...

Using data from NASA's Transiting Exoplanet Survey Satellite, scientists have identified an Earth-size world, called TOI 700 e, orbiting within the habitable zone of its star -- the range of distances ...

A NASA mission has spotted an Earth-size exoplanet orbiting a small star about 100 light-years away. The planet, named TOI 700 e, is likely rocky and 95% the size of our world. The celestial body is ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. NASA’s planet-hunting mission TESS has found ...

A planet-size object may be orbiting the sun in the icy reaches of the solar system beyond Pluto. Scientists at the University of Arizona's Lunar and Planetary Laboratory (LPL) have determined that an ...

A newly discovered warp in the outer Solar System may have been created by a small, rocky world, much closer to the Sun than ...

The International Astronomical Union (IAU) defines a planet as a celestial body orbiting the Sun, possessing sufficient mass for a nearly spherical shape, and having cleared its orbital neighborhood ...

Scientists have discovered over 4,000 exoplanets outside of our Solar System, according to NASA's Exoplanet Archive. Some of these planets orbit multiple stars at the same time. Certain planets are so ...

JWST found a carbon-atmosphere planet orbiting a pulsar, challenging current models of how planets form. Scientific progress often comes from data that don’t fit our current understanding. This idea, ...

This hypothetical world, dubbed "Planet Y," could be around the same size as Earth and may exist alongside another popular Planet Nine candidate — potentially bringing our cosmic neighborhood's ...