All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...

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

All the planets in the solar system orbit the sun on the same plane and in the same direction — west to east. That's called prograde motion. Mercury is constantly racing around the sun ...

A rare parade of planets will light up the night sky throughout January. Six planets will be in alignment for the rest of the ...

Since the orbital motion of our planet makes the Sun appear to move eastward relative ... Compared to Venus's revolution period in Earth days, which is around 19.44 million seconds, it turns ...

"The Doppler effect is the stretching or squashing of waves because of motion ... bubble' around the Sun, called the heliosphere. The heliosphere extends beyond the orbit of the planets in ...

The Red Planet will be at its closest point to Earth, also known as perigee, on Jan. 12 and will be exactly opposite the sun ...

The Franklin Institute's Derrick Pitts says Venus, Saturn, Jupiter and Mars will be 'easy to see at a comfortable time of observing.' ...

Astronomers have achieved a groundbreaking milestone by capturing the first-ever image an astrosphere around a star ...