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PICTURE SHOWS: EARTH. In this image, taken by astronauts aboard the International Space Station (ISS) in 2011, a green band of oxygen glow is visible over Earth's curve. Airglow occurs in Earth's atmospheres as sunlight interacts with atoms and molecules within the atmosphere. ... STORY CAPTION: ESA???s ExoMars Trace Gas Orbiter has detected glowing green oxygen in Mars??? atmosphere ??" the first time that this emission has been seen around a planet other than Earth. On Earth, glowing oxygen is produced during polar auroras when energetic electrons from interplanetary space hit the upper atmosphere. This oxygen-driven emission of light gives polar auroras their beautiful and characteristic green hue. The aurora, however, is just one way in which planetary atmospheres light up. The atmospheres of planets including Earth and Mars glow constantly during both day and night as sunlight interacts with atoms and molecules within the atmosphere. Day and night glow are caused by slightly different mechanisms: night glow occurs as broken-apart molecules recombine, whereas day glow arises when the Sun???s light directly excites atoms and molecules such as nitrogen and oxygen. On Earth, green night glow is quite faint, and so is best seen by looking from an ???edge on??? perspective ??" as portrayed in many spectacular images taken by astronauts aboard the International Space Station (ISS). This faintness can be an issue when hunting for it around other planets, as their bright surfaces can drown it out. This green glow has now been detected for the first time at Mars by the ExoMars Trace Gas Orbiter (TGO), which has been orbiting Mars since October 2016. ??sOne of the brightest emissions seen on Earth stems from night glow. More specifically, from oxygen atoms emitting a particular wavelength of light that has never been seen around another planet,??? says Jean-Claude G??rard of the Universit?? de Li??ge, Belgium, and lead author of the new study published in
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arch40
2011-06-16
Cover Images/East News
Cover Images
coverimages40569760
0,09MB
9cm x 7cm by 300dpi
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