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

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

Stargazers will be treated to a rare seven-planet alignment in February. This is what scientists hope to learn.

New findings offer clues about the ancient origins of asteroids and their potential role in the formation of terrestrial ...

New research shows that star activity can distort exoplanet measurements, affecting size, temperature, and atmosphere ...

To better understand why the planets have variable compositions ... to the formation of the gas and ice giants in the outer solar system. This first-order model of planetary growth in the solar ...

Most of the information we have about planets beyond our solar system (exoplanets ... as it will seem to block out more of the star's light, or they might infer the planet is hotter than it ...

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 ... to figure out how the orbits ...

Plate tectonics give Earth its mountains, earthquakes, continental drift and maybe even helped give rise to life itself. But do other planets in the solar system have them too?

then it could disprove the notion that there is a ninth planet lurking out in the darkness of our Solar System beyong Neptune. But should the orbits of the new objects follow the trend ...

If everything in our solar system formed from the same solar nebula, why do the planets have different compositions? Herbert Wich Titusville, Florida To better understand why the planets have variable ...