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 ...

Mars, Venus, Jupiter, Saturn, Uranus and Neptune will appear together in a row throughout the start of February – although Neptune and Uranus will only be visible with binoculars or a telescope.

A great planetary alignment that's coming sometime this month — there are a few different dates being thrown around. Rumor has it that as many as six planets will be in a line and visible in the ...

While the composition of gas and dust in a molecular cloud is fairly uniform, everything changes once a star begins to form.

It will just be different lineup of planets. The event that's happening ... are visible any clear night between sunset and about 8 p.m., from now until mid-February," Pitts said.

Timing: Dusk after sunset, but before 9 p.m. local time There are eight planets in our solar system ... the magnitude scale show what we can see at different magnitudes to help put these numbers ...

An object eight times the mass of Jupiter may have swooped around the sun, coming superclose to Mars' present-day orbit before shoving four of the solar system's planets onto a different course.