Mercury joins the night sky to complete a seven-planet alignment just after sunset for the end of February. Saturn leaves our ...

Like a celestial parade across the cosmos, five bright planets are lighting up the night sky and visible with the naked eye all February long — with two other planets also detectable for skywatchers ...

Mercury takes only 88 Earth days to orbit the sun.

The closest of the asteroids to us—estimated to be about the size of a car—is whizzing through space at 27,358 miles per hour ...

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

Space agencies have systems in place to spot, track, and forecast the future orbits of potentially hazardous asteroids.

then the difference in this path can be traced out and allows you to measure the eccentricity of the orbit and determine its perihelion as well." All solar system planets have fairly circular ...

The world's space agencies are keeping close watch on an asteroid heading our way, because there's currently a 1 in 83 chance ...