A massive interstellar object passing through our solar system during its formative years likely altered the orbits of planets into trajectories observed today, a new study says. Interactions with ...

Something unusual seems to be lurking at the far edge of our Solar System. Some think it could be a hidden, oversized planet.

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Theorbits of Jupiter, Saturn, Uranus and Neptune may have been altered ...

At the center of our solar system, the sun influences every planet that orbits it. In two recent studies, scientists ...

The shape of a planet's orbit is one of its fundamental properties, along with its size and distance from its host star. Earth has a nearly circular orbit, but some planets outside our solar system, ...

For the inner four planets in this solar system, each planet orbits the sun three times for every two orbits of the planet immediately to its outside. For the fourth, fifth and sixth planets, they ...

Jupiter is the largest planet in the Solar System, a massive gas giant so enormous that its gravitational influence reaches ...

An international team of astronomers has discovered eight new extrasolar planets, bringing to nearly 80 the number of planets found orbiting nearby stars. The latest discoveries, supported by the ...

CAPE CANAVERAL, Fla. — Astronomers have discovered a rare solar system in the Milky Way that boasts six planets orbiting in perfect rhythm like a cosmic orchestra, untouched by outside forces since ...

EVANSTON, Ill. — Except for the fact that we call it home, for centuries astronomers didn’t have any particular reason to believe that our solar system was anything special in the universe. But, ...