Nor were these worlds all small like our inner planets. The most common planets seen by Kepler have a radius between Earth’s and Neptune’s — unlike any planet in the Solar System.

to find an Earth-like planet orbiting a sunlike star. Her current focus is the Transiting Exoplanet Survey Satellite (TESS), an MIT-led NASA space telescope launched last year. Like Kepler ...

as well as how many of those planet systems are like our solar system. He said our solar system is rare; most planetary systems are more compact than ours, and many systems contain super-Earth ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But do other planets in the solar system have them too?

Almost 30 years after the first planet outside our solar system was discovered, more than 7,000 other exoplanets have been identified. Now, it’s time to add another to the list. A team of researchers ...

A new study implies that in the past, moons in our solar system may have had rings just like planets do ... moons and their neighboring planets, including Earth and the moon.