Our solar system may have hosted up to six giant planets in its first hundred million years, a new study suggests. The ...

Every planet in the Solar System, including Earth, orbits a shared center of mass rather than the geometric center of the Sun ...

The outer solar system once seemed like a quiet backwater. But a glut of tiny, strange moons with unruly orbits are coming ...

We usually think of our Solar System as a calm, well-organized family of planets, but a new study suggests its early days may ...

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 ...

Computer simulations have revealed a plausible explanation for a phenomenon that has puzzled astronomers: Rather than occupying orbits at regular distances from a star, giant gas planets similar to ...

A study recently submitted to The Astronomical Journal continues to search for the elusive Planet Nine (also called Planet X), which is a hypothetical planet that potentially orbits in the outer ...

Jupiter, Saturn, Uranus and Neptune did not always have their current positions in the solar system. According to the ...

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 ...

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, ...

This video challenges the common, simplified view of the solar system animation by illustrating the dynamic and complex ...

When planetary scientists look to other stars for planets beyond Earth, they don’t often turn up much that resembles our solar system. Whether it’s because of star size, detection method, or observing ...