Pluto was discovered in 1930 in Arizona, but in 2006 scientists decided to cut Pluto from the planetary line up. Here is why ...

Jupiter is the largest planet in the solar system. It's about 11 times wider than Earth with an equatorial diameter of 88,846 ...

The Hubble Space Telescope time-lapse captured footage of Jupiter, Saturn, Uranus and Neptune. Credit: SCIENCE: NASA, ESA, ...

Even Pluto is accurately modeled, about 300 kilometers from the Sun. In addition to the eight major planets, the Sweden Solar System also includes models of some moons, asteroids, and comets, such as ...

From Lowell Observatory to Kitt Peak to Mount Graham, here are the 11 best planetariums and observatories in Arizona and ...

Perhaps the best known of all comets is Halley, correctly pronounced so that it rhymes with rally, not daily. It is named after the 17th-18th century astronomer Edmond Halley. This ...

Comet SWAN, hailing from the Oort Cloud beyond Pluto, has been visible through ... Every so often, a comet passes through the inner solar system. “These are relics from when the solar system ...

To mark the 35th anniversary of the Hubble Space Telescope, Space.com looks at some of the most scientifically significant images that have emerged from the observatory's lens.

Serving nine UC campuses and two national laboratories, Lick Observatory continues to be at the forefront of groundbreaking ...

Saturn is practically a solar system unto itself. Pluto may not count as a planet ... SOHO / ESA & NASA Saturnian moons Titan and Tethys in clear view as the shadow of Saturn darkens the far ...

Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen ... from some oddities in the orbits of small Pluto-like bodies. The cosmic weirdness could ...