Solar System: Things to Know This Week
Reaching out into space yields benefits on Earth. Many of these have practical applications ā but thereās something more than that. Call it inspiration, perhaps, what photographer Ansel Adams referred to as natureās āendless prospect of magic and wonder."Ā
Our ongoing exploration of the solar system has yielded more than a few magical images. Why not keep some of them close by to inspire your own explorations? This week, we offer 10 planetary photos suitable for wallpapers on your desktop or phone. Find many more in our galleries. These images were the result of audacious expeditions into deep space; as author Edward Abbey said, "May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view.ā
This self-portrait of NASAās Curiosity Mars rover shows the robotic geologist in the āMurray Buttesā area on lower Mount Sharp. Key features on the skyline of this panorama are the dark mesa called āM12ā to the left of the roverās mast and pale, upper Mount Sharp to the right of the mast. The top of M12 stands about 23 feet (7 meters) above the base of the sloping piles of rocks just behind Curiosity. The scene combines approximately 60 images taken by the Mars Hand Lens Imager, or MAHLI, camera at the end of the roverās robotic arm. Most of the component images were taken on September 17, 2016.
NASAās New Horizons spacecraft captured this high-resolution, enhanced color view of Pluto on July 14, 2015. The image combines blue, red and infrared images taken by the Ralph/Multispectral Visual Imaging Camera (MVIC). Plutoās surface sports a remarkable range of subtle colors, enhanced in this view to a rainbow of pale blues, yellows, oranges, and deep reds. Many landforms have their own distinct colors, telling a complex geological and climatological story that scientists have only just begun to decode.
3. The Day the Earth Smiled
On July 19, 2013, in an event celebrated the world over, our Cassini spacecraft slipped into Saturnās shadow and turned to image the planet, seven of its moons, its inner rings ā and, in the background, our home planet, Earth. This mosaic is special as it marks the third time our home planet was imaged from the outer solar system; the second time it was imaged by Cassini from Saturnās orbit, the first time ever that inhabitants of Earth were made aware in advance that their photo would be taken from such a great distance.
Before leaving the Pluto system forever, New Horizons turned back to see Pluto backlit by the sun. The small worldās haze layer shows its blue color in this picture. The high-altitude haze is thought to be similar in nature to that seen at Saturnās moon Titan. The source of both hazes likely involves sunlight-initiated chemical reactions of nitrogen and methane, leading to relatively small, soot-like particles called tholins. This image was generated by combining information from blue, red and near-infrared images to closely replicate the color a human eye would perceive.
A huge storm churning through the atmosphere in Saturnās northern hemisphere overtakes itself as it encircles the planet in this true-color view from Cassini. This picture, captured on February 25, 2011, was taken about 12 weeks after the storm began, and the clouds by this time had formed a tail that wrapped around the planet. The storm is a prodigious source of radio noise, which comes from lightning deep within the planetās atmosphere.
Another massive storm, this time on Jupiter, as seen in this dramatic close-up by Voyager 1 in 1979. The Great Red Spot is much larger than the entire Earth.
Jupiter is still just as stormy today, as seen in this recent view from NASAās Juno spacecraft, when it soared directly over Jupiterās south pole on February 2, 2017, from an altitude of about 62,800 miles (101,000 kilometers) above the cloud tops. From this unique vantage point we see the terminator (where day meets night) cutting across the Jovian south polar regionās restless, marbled atmosphere with the south pole itself approximately in the center of that border. This image was processed by citizen scientist John Landino. This enhanced color version highlights the bright high clouds and numerous meandering oval storms.
X-rays stream off the sun in this image showing observations from by our Nuclear Spectroscopic Telescope Array, or NuSTAR, overlaid on a picture taken by our Solar Dynamics Observatory (SDO). The NuSTAR data, seen in green and blue, reveal solar high-energy emission. The high-energy X-rays come from gas heated to above 3 million degrees. The red channel represents ultraviolet light captured by SDO, and shows the presence of lower-temperature material in the solar atmosphere at 1 million degrees.
9. One Space Robot Photographs Another
This image from NASAās Mars Reconnaissance Orbiter shows Victoria crater, near the equator of Mars. The crater is approximately half a mile (800 meters) in diameter. It has a distinctive scalloped shape to its rim, caused by erosion and downhill movement of crater wall material. Since January 2004, the Mars Exploration Rover Opportunity has been operating in the region where Victoria crater is found. Five days before this image was taken in October 2006, Opportunity arrived at the rim of the crater after a drive of more than over 5 miles (9 kilometers). The rover can be seen in this image, as a dot at roughly the āten o'clockā position along the rim of the crater. (You can zoom in on the full-resolution versionĀ here.)
Last, but far from least, is this remarkable new view of our home planet. Last week, we released new global maps of Earth at night, providing the clearest yet composite view of the patterns of human settlement across our planet. This composite image, one of three new full-hemisphere views, provides a view of the Americas at night from the NASA-NOAA Suomi-NPP satellite. The clouds and sun glint ā added here for aesthetic effect ā are derived from MODIS instrument land surface and cloud cover products.
Discover more lists of 10 things to know about our solar system HERE.
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