planet

Mercury’s Hot Flow Revealed by MESSENGER

by Jason Major June 18, 2014

Want to stay on top of all the space news? Follow @universetoday on Twitter Our Sun is constantly sending a hot stream of charged atomic particles out into space in all directions. Pouring out from holes in the Sun’s corona, this solar wind flows through the Solar System at speeds of over 400 km/s (that’s 893,000 mph). When […]

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Mercury’s Ready For Its Close-Up, Mr. MESSENGER

by Jason Major May 15, 2014

Are you ready for a good close look at Mercury? At an incredible 5 meters per pixel, this is one of the highest-resolution images of Mercury’s surface ever captured. It was acquired on March 15 with the MESSENGER spacecraft’s MDIS (Mercury Dual Imaging System) instrument and shows an 8.3-km (5.2-mile) -wide section of Mercury’s north polar region, […]

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Cassini’s View of Another Pale Blue Dot

by Jason Major May 1, 2014

When you hear the words “pale blue dot” you’re probably reminded of the famous quote by Carl Sagan inspired by an image of Earth as a soberingly tiny speck, as imaged by Voyager 1 on Feb. 14, 1990 from beyond the orbit of Pluto. But there’s another pale blue world in our Solar System: the ice […]

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An Afternoon on Mars

by Jason Major March 28, 2014

Here’s a pretty picture for your Friday: a mosaic of Mastcam images acquired by Curiosity on mission Sol 582, also known to us Earthlings as Thursday, March 27, 2014. Barsoom sure looks lovely this time of year! Remove this ad Jason Major on Google+

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Mercury Shrinking: the First Rock from the Sun Contracted More than Once Thought

by Jason Major March 16, 2014

Whatever Mercury’s did to trim down its waistline has worked better than anyone thought — the innermost planet in our Solar System has reduced its radius* by about 7 kilometers (4.4 miles), over double the amount once estimated by scientists. Of course you wouldn’t want to rush to begin the Mercury diet — its planetary […]

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