Animation of the apparent retrograde motion of Mars in 2003 as seen from Earth

Animation of the apparent retrograde motion of Mars in 2003 as seen from Earth

What is retrograde motion?   via Shareaholic

What is retrograde motion? via Shareaholic

“Eye of God” Nebula, Auroras, Planetary Orbits, Formation of Solar System and Retrograde motion of planets presented with eye catching GIFs

“Eye of God” Nebula, Auroras, Planetary Orbits, Formation of Solar System and Retrograde motion of planets presented with eye catching GIFs

Mars appears to reverse its course in the night sky. This image by Tunc Tezel shows the retrograde motion by layering images in time series. The dotted line to right is Uranus doing the same thing.

Mars appears to reverse its course in the night sky. This image by Tunc Tezel shows the retrograde motion by layering images in time series. The dotted line to right is Uranus doing the same thing.

Retrograde motion of Mars. Image credit: NASA

Retrograde motion of Mars. Image credit: NASA

retrograde motion http://scienceblogs.com/startswithabang/files/2010/09/retrogrademars_tezel_big.jpeg

retrograde motion http://scienceblogs.com/startswithabang/files/2010/09/retrogrademars_tezel_big.jpeg

Venus is one unique planet when it comes to rotational motion. It takes Venus 243 Earth days to completely rotate on its axis, but just 225 days to orbit the sun. Venus also is one of two planets that rotates in reverse, a phenomenon called retrograde motion, which according to most theories is due to an ancient planetary collision.

Venus is one unique planet when it comes to rotational motion. It takes Venus 243 Earth days to completely rotate on its axis, but just 225 days to orbit the sun. Venus also is one of two planets that rotates in reverse, a phenomenon called retrograde motion, which according to most theories is due to an ancient planetary collision.

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