These six narrow-angle color images were made from the first-ever 'portrait' of the solar system taken by Voyager 1, which was more than 4 billion miles from Earth and about 32 degrees above the ecliptic.

Oct 21, 2025 · Pluto was once our solar system's ninth planet, but has been reclassified as a dwarf planet. It's located in the Kuiper Belt.

Oct 21, 2025 · NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.

Oct 21, 2025 · Planets About Planets PLANETS Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune DWARF PLANETS Pluto Ceres Makemake Haumea Eris

While both have nearly circular orbits and travel close to the plane of the planet's equator, they are lumpy and dark. Phobos is slowly drawing closer to Mars and could crash into the planet in 40 or 50 …

In 1930, soon after the discovery of Pluto, astronomer Fred-erick C. Leonard suggested that Pluto was but one of many “ultra-Neptunian” or “trans-Neptunian” small bodies.

It shares many similarities with Pluto, the best known world of the Kuiper Belt. Like our own moon, Triton is locked in synchronous rotation with Neptune―one side faces the planet at all times.

Without the Sun’s energy, life as we know it could not exist on our home planet. From our vantage point on Earth, the Sun may appear like an unchanging source of light and heat in the sky.

In 1930, Pluto became the first Kuiper Belt object to be discovered. It was found at a time before astronomers had reason to expect a large population of icy worlds beyond Neptune.

Lesson Overview ot only the physical sizes of the Sun an planets, but also the distances between them. Planets are tiny worlds in a vast space. In October 2001, the Voyage Scale Model Solar System …