For months, President Trump has taunted Canada by claiming it should become America's 51st state. But the country's new prime ...

The solar system is our cosmic neighborhood, made up of the sun and everything that orbits it — planets, moons, asteroids ... At the center is the sun, a yellow dwarf star that contains 99.8 ...

Earth has four seasons, but do other planets in our solar system also have hot summer days and cold winter nights?

Our solar system may have a ninth planet after all, following the declassification of Pluto nearly two decades ago, ...

Astronomers have detected a promising sign of a ninth planet lurking at the the farthest reaches of the Solar System.

The solar system consists of our star, the sun, and everything bound to it by gravity: the planets Mercury, Venus, Earth, ...

Discovered in 1930, Pluto was long considered our Solar System's ninth planet, but was unseated in 2006 after the discovery ...

sitting in the Kuiper Belt - a region in our solar system beyond Neptune filled with icy objects, comets, and dwarf planets like Pluto. Since this hidden planet may be so far away, the new study ...

In 2020, astronomers detected WD 1856+534 b, a gas giant that orbits a star 81 light-years from Earth. This exoplanet, which ...

In this region, objects in space could cross any dwarf planet ... the solar system, particularly the Kuiper Belt. On July 14, 2015, New Horizons conducted a flyby past Pluto and its moons ...

As just about everyone in the solar system ... Moons of Jupiter and Saturn are wider than Mercury, and Pluto is smaller than Earth's moon. For years, astronomers tried to define a planet by ...