The newfound exoplanet, known as TOI 700 d, lies just 101.5 light-years from Earth, ... the first Earth-size, haitable-zone planet discovered by NASA's Transiting Exoplanet Survey Satellite.

Astronomers have discovered an Earth-size planet orbiting a red dwarf star, making just the second planetary system seen around one of these tiny, cool, dim, but common, stars.

This planet has the smallest mass -- a measurement of weight that doesn't include gravity -- that has been found outside our solar system so far. With a mass of about 1.1 times the size of Earth ...

Planet-Making 101. By Charles Q. Choi. ... At 30 million to 250 million years old, it is a younger cousin of our 4.5-billion-year-old sun, but based on the size of its ring, ...

The authors came to this conclusion by studying isotopes or types of the element potassium, to trace the abundance of water. Examining 20 confirmed Martian meteorites suggested that the planet ...

However, Kepler-186f is the first alien planet this close to Earth in size found orbiting in that potentially life-supporting area of an extrasolar system, according to exoplanet scientists. 'An ...

Evidence has been found of a planet circling the smouldering remains of a dead star in a tight orbit. ... the transiting planet is similar in size to Jupiter, ... Astrophys. J. 860, 101 (2018).

An artist's concept of the newfound Earth-size exoplanet SPECULOOS-3 b orbiting its red dwarf star. (Image credit: NASA/JPL-Caltech) A hot planet around a cool star ...

Scientists have discovered a new planet that's 226 light-years away. It is roughly twice the size of Earth, which is rare for an exoplanet.

Stellar data from the Kepler spacecraft are used to infer the existence of a sub-Mercury-sized exoplanet, the smallest yet discovered, in orbit around a Sun-like star. When the Kepler spacecraft ...