An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit ...

Earth, HD 20794 d, orbiting a nearby sun-like star, offering a promising lead in the search for life beyond our planet.

The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

To get somewhere in outer space, you can’t exactly drive in a straight line. Orbits are tricky things, and sending a probe to ...

This may explain the strange properties of the orbits of our solar system's planets, which are not quite perfectly circular, and all lie on slightly different planes. NASA artist’s conception of ...

A new study claims it is possible an "alien visitor" could have warped our solar system during its earliest years.

The research, yet to be peer-reviewed, sheds light on what could have changed the orbits of several planets in the solar system.

Ever since Isaac Newton famously talked about gravity, its dominance as a force in our solar system has been well known. It's ...

Despite common assumptions, the disk of our Solar System is warped, and the planets travel around the Sun in slightly eccentric (or oblong) orbits. Scientists now think that a mysterious object ...

with highly “tilted” orbits compared to the ecliptic plane. This seemed odd and illogical as when the Solar system formed, it would be expected that objects that developed in the circumstellar ...

The enormous visitor to our solar system may have been about 8 times the mass of Jupiter, and come nearly as close to the sun as the orbit of Mars.