The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

Explore Ceres, the largest asteroid in our solar system, and discover its remarkable ancient ocean and ice-rich crust.

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien astronomers could also be scanning Earth.

NASA artist’s conception of a brown dwarf (main) and stock image of the planets in the solar system (inset ... this time including the orbits of the inner planets (Mercury, Venus, Earth ...

Scientists studying samples that NASA collected from the asteroid Bennu found a wide assortment of organic molecules that ...

All of our solar system’s planets are lining up to ... apparent than during a planetary alignment. An alignment including all of the planets except Mercury is taking place in mid-January.

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

Gaia-4b is considered a super-Jupiter planet, a relatively cold gas giant, orbiting its star over 570 Earth-days. That star ...

The organic ingredients to life, hints to where Earth’s water came from, and the fundamental building blocks of our planet ...

Timing: Dusk after sunset, but before 9 p.m. local time There are eight planets in our solar system and one dwarf planet (Pluto). Because we live on Earth, the most we could see is a maximum of ...