How far away is Mars? The exact answer varies, of course, as both it and our planet are constantly moving along their own orbits around the Sun. But on average, Mars is about 225 million km/140 million miles from Earth. Give or take a few.

To most people (myself included) those are just numbers. Big numbers — and really not even all that big in an astronomical sense. So to give a sense of what it means to cross the distance between here and Mars, interactive designer David Paliwoda created a web page that illustrates the scale involved quite nicely. If our entire planet were reduced to a sphere 100 pixels in diameter, and you could travel outward at a velocity of 200,000 km/h (7,000 pixels/second, in his model) how far would Mars be?

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SSERVI Science Teams

  • Observations of the lunar impact plume from the LCROSS event


    McMath‐Pierce telescope observed sodium (Na) emission from LCROSS impact on October 9, 2009.When the Lunar Crater Observing and Sensing Satellite (LCROSS) impacted Cabeus crater on October 9th, it pitched up frozen water along with some sodium, astronomers reported today.

    According to the LCROSS team, the impact event pitched up about 660 pounds of water frozen on the bottom of the crater. NLSI researcher R. M. Killen at NASA’s Goddard Spaceflight Center reported that the plume also contained about 3.3 pounds of sodium chloride.

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Water ice and other frozen volatiles are to be found in many shadowed craters near the lunar poles.

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