The smallest disk identified, meanwhile, stretched to just 0.6 AU – closer to the star than the Earth is to the Sun.

The NEO Surveyor fulfills a 2005 act of Congress ordering NASA to catalog 90% of near-Earth objects larger than 459 feet (140 ...

For the better part of a century, we believed there were nine planets in our solar system, with Pluto being the farthest from the sun. Since the discovery of more Pluto-sized dwarf planets, that ...

Scientists estimate there are ~1 septillion (1 followed by 24 zeros) planets in the observable universe. This figure is based ...

The solar system was packed with 50 to 100 protoplanets billions of years ago. Not all of them lived to tell the tale of the ...

Mar. 17, 2025 — The James Webb Space Telescope has captured its first direct images of carbon dioxide in a planet outside the solar system in HR 8799, a multiplanet system 130 light-years away ...

Learn what planet rains molten iron and which planet has two moons like Tatooine in Star Wars.

The relative quantities of volatile gases like methane and ethane can reveal key details about distant Kuiper Belt objects.

NASA discovers four sub-Earth exoplanets orbiting Barnard's Star after a century-long search. Find out how this changes the ...

Out past Neptune are countless small icy and rocky bodies called Trans-Neptunian Objects (TNOs), and many of these have moons ...

Why was Pluto reclassified as a dwarf planet? One might think that it’s purely a matter of size. Mercury, the smallest of the ...

More than 60 years after the first debunked discovery of a planet orbiting Barnard’s Star, the closest single-star system to ...