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 ...

Though the planets are always “aligned,” seeing more than four in the sky is more uncommon. February’s lineup is a chance to ...

HD 20794 d, with a mass six times that of Earth, orbits a star similar to our sun. The planet’s location within the habitable ...

Here’s what you should know when you go outside to see for yourself: Yes, the planets are indeed lined up across our sky. No, ...

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

you’re peering into the vast expanse of our solar system. Each planet orbits the Sun at vastly different distances—Mercury sits about 36 million miles, while Neptune is at a stately 2.8 ...

Located less than 20 light years away, HD 20794d could potentially be one of the most Earth-like planets found so far, ...

The exoplanet – a planet outside our solar system – has a mass six times greater than that of Earth, and orbits in the ...

All solar system planets have fairly circular orbits with relatively minuscule differences in their distance from the sun at aphelion and perihelion. Venus and Neptune follow the most circular orbits.

Florian said the planetary parade should be visible throughout Alberta until the end of February, with the last Earth-visible ...

The article humorously imagines how planets would describe themselves if they were dating profiles. Each planet has a unique ...