Eventually, in 2006, the IAU settled on a three-part definition: a planet orbits the ... there’s no scientific reason we can’t have thousands of planets in the solar system, but cultural ...

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

This article was produced for Kavli Prize by Scientific ... their orbits are not in a random jumble. Instead, they’re all aligned—with orbits that are tilted compared to the solar system ...

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 ...

HD 20794 d completes its orbit just shy of two Earth years, placing it well within reach of conditions that might harbor life ...

An artist’s impression of a small, rocky interstellar object hurtling from the upper right toward the inner solar system. The orbits of the four inner planets (Mercury, Venus, Earth, Mars) are ...

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

When you first learned about the Solar System, you probably saw diagrams that made it look orderly, with planets arranged in circular orbits around the Sun on a flat disk. But in reality, our Solar ...

ANDES stands for ArmazoNes high Dispersion Echelle Spectrograph. AndES is a high-resolution instrument that can search for ...

However, it was not until Kepler's observations that the planets followed elliptical orbits around the sun (rather than circular orbits) that astronomical models matched observations of the ...

The Sun is the largest object in the Solar System. The Sun's huge gravitational ... for example, Mercury orbits once every 88 Earth days, but Neptune orbits once every 165 Earth years For a ...

A planet-size object that possibly once visited the solar system may have permanently changed our cosmic neighborhood by warping the orbits of the ... life Using computer models of the four ...