“The Alps in Winter” was uploaded to Flickr

European Space Agency (ESA) astronaut and Expedition 46 Flight Engineer Tim Peake (@astro_timpeake) photographed the Alps from orbit on Dec. 27, 2015 and later shared the image with his social media followers, writing, "There may not be much snow in the Alps this winter but they still look stunning from here! #Principia" via NASA ift.tt/1miLof5
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The Alps in Winter was taken on December 27, 2015 at 08:06AM

“Reading the Alphabet From Space” was uploaded to Flickr

NASA's Earth Observatory has tracked down images resembling all 26 letters of the English alphabet using only NASA satellite imagery and astronaut photography. In this image, the letter 'Y' is for yardangs, elongated landforms sculpted by erosion and similar to sand dunes, but instead comprised of sandstone or siltstone. via NASA ift.tt/1ZzD7Bo
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Reading the Alphabet From Space was taken on October 08, 2015 at 07:26AM

“Boulders on a Martian Landslide” was uploaded to Flickr

The striking feature in this image, acquired by the HiRISE camera on NASA's Mars Reconnaissance Orbiter on March 19, 2014, is a boulder-covered landslide along a canyon wall. Landslides occur when steep slopes fail, sending a mass of soil and rock to flow downhill, leaving behind a scarp at the top of the slope. via NASA ift.tt/1ZxnSsx
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Boulders on a Martian Landslide was taken on December 21, 2015 at 11:15AM

“Christmas Pluto” was uploaded to Flickr

Pluto gets into the holiday spirit, decked out in red and green using a pair of Ralph/LEISA instrument scans. via NASA ift.tt/22quRWL
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Christmas Pluto was taken on December 24, 2015 at 01:31AM

“Zinnia Flowers Starting to Grow on the International Space Station” was uploaded to Flickr

Zinnia flowers are starting to grow in the International Space Station's Veggie facility as part of the VEG-01 investigation. Veggie provides lighting and nutrient supply for plants in the form of a low-cost growth chamber and planting "pillows” to provide nutrients for the root system. via NASA ift.tt/1mApUtZ
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Zinnia Flowers Starting to Grow on the International Space Station was taken on December 15, 2015 at 05:58AM

“NASA Astronaut Tim Kopra on Dec. 21 Spacewalk” was uploaded to Flickr

Expedition 46 Flight Engineer Tim Kopra on a Dec. 21, 2015 spacewalk, in which Kopra and Expedition 46 Commander Scott Kelly successfully moved the International Space Station's mobile transporter rail car ahead of Wednesday's docking of a Russian cargo supply spacecraft. via NASA ift.tt/1S8leHF
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NASA Astronaut Tim Kopra on Dec. 21 Spacewalk was taken on December 21, 2015 at 08:29AM

“Chandra Finds Remarkable Galactic Ribbon Unfurled” was uploaded to Flickr

An extraordinary ribbon of hot gas trailing behind a galaxy like a tail has been discovered using data from NASA’s Chandra X-ray Observatory. via NASA ift.tt/1OGFdI6
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Chandra Finds Remarkable Galactic Ribbon Unfurled was taken on December 21, 2015 at 04:14AM