• AstroMarshburn/Twitter
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    This image of Betsiboka River Delta in Madagascar was tweeted on March 15 by Astronaut Thomas H. Marshburn from the International Space Station. He wrote, "Madagascar’s Betsiboka River Delta – red with soil from it’s central highlands pic.twitter.com/aQFCttnZe0"

  • AstroMarshburn/Twitter
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    This image of ridges on Mexico's Sierra Madres mountains was tweeted on March 15 by Astronaut Thomas H. Marshburn from the International Space Station. He wrote, "Ridges of Mexico’s Sierra Madres – would love to know what forces created these! pic.twitter.com/YhNw9WUnRT"

  • AP Photo/Arun Sankar K.
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    Indian army soldiers spit fire as they perform the mallakhamb, a traditional Indian gymnastic sport, during a display of skills at Officers Training Academy in Chennai, India, Friday, March 15. 

  • NASA/JPL/University of Arizona
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    This NASA image of the day for March 15 shows gully landforms in a crater on Mars. It was taken by the High Resolution Imaging Science Experiment (HiRISE) onboard the Mars Reconnaissance Orbiter mission. Changes in gullies were first seen in images from the Mars Orbiter Camera in 2006, and studying such activity has been a high priority for HiRISE.

  • Cmdr_Hadfield/Twitter
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    This image of Cold Lake in Alberta, Canada, was tweeted on March 15 by Astronaut Chris Hadfield from the International Space Station. He wrote, "Cold Lake, Alberta, deep and aptly named. Son Evan was born at the RCAF CF-18 training base visible at lower left. pic.twitter.com/4Kc3y0zUjU"

  • AP Photo/dpa, Stefan Sauer
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    Tourists take a stroll at Koserow beach on the Baltic Sea, on the island of Usedom, northeastern Germany, Thursday, March 14.

  • NASA Earth Observatory
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    Dust from the Gobi Desert blew across the coastal plain of eastern China in mid-March 2013. When NASA's Aqua satellite captured this natural-color image on March 14, aerosols were thick over Beijing and the Bo Hai Sea. Although dust hung heavy over the plain, some mountain peaks (such as those of the Taihang Shan) rose above the dust and haze.

  • Cmdr_Hadfield/Twitter
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    This image of a patchwork of farms in Central Asia was tweeted by astronaut Chris Hadfield on March 14. He wrote, "Crazed patchwork of farms in Central Asia, a monochromatic 3D hallucination in the snow. pic.twitter.com/PaKYxOn7fg"

  • AP Photo/Raad Adayleh
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    Jordanian and Syrian children participate in a candlelit vigil to mark the second anniversary of the Syrian revolution at the Citadel in Amman, Jordan, Thursday, March, 14. 

  • Cmdr_Hadfield/Twitter
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    Next: Today's 10 Must-See Photos: 3-14-2013

    This image of the inside of the International Space Station's Cupola was tweeted Astronaut Chris Hadfield from the ISS on March 15. He wrote, "Inside the Cupola in the shadow of the Earth, our nighttime. Very cool photo by Kevin Ford. pic.twitter.com/KJssaQjWwa"