Nasa images of change9/12/2023 ![]() ![]() The Blue Marble was not the first clear color image taken of an illuminated face of Earth, since such images by satellites had already been made and released as early as 1967, and is the second time such a photo was taken by a person after the 1968 photograph Earthrise taken by William Anders of Apollo 8. To the astronauts, the slightly gibbous Earth had the appearance and size of a glass marble, hence the name. The astronauts had the Sun above them when they took the image. The photograph, taken on December 7, 1972, is one of the most widely distributed photographic images in existence. Likewise, these images do not fit together properly and due to lighting, weather and cloud interference it is impossible to collect cohesive or fully clear images to begin with. NASA has verified all images of the 2012 "blue marble" are composites as they cannot get far enough away and have to combine multiple photos together. These were created by looking through satellite pictures taken over time in order to find as many cloudless photographs as possible to use in the final images. NASA has also applied the name to a 2012 series of images which cover the entire globe at relatively high resolution. In addition to the Arabian Peninsula and Madagascar, almost the entire coastline of Africa and most of the Indian Ocean are clearly visible, a cyclone in the Indian Ocean is also visible, the South Asian mainland is on the eastern limb. This was the first time the Apollo trajectory made it possible to photograph the south polar ice cap, despite the Southern Hemisphere being heavily covered in clouds. It mainly shows Earth from the Mediterranean Sea to Antarctica. Taken by the crew of the Apollo 17 spacecraft on its way to the Moon, it is one of the most reproduced images in history. The Blue Marble is a photograph of Earth taken on December 7, 1972, from a distance of around 33,000 kilometers (21,000 miles) from the planet's surface. The Blue Marble, taken by the Apollo 17 crew in 1972 For other uses, see Blue Marble (disambiguation). Geological Survey and National Park Service will be documenting the shifts in sediment along the river over the coming weeks.Ĭontact Colton Lochhead at Follow on Twitter."Blue Marble" redirects here. Long-term drought that has led to a hotter, dryer climate in the Southwest and less water flowing into the Colorado River each year has forced federal water managers to prioritize keeping more water in Lake Powell. This year’s high flow experiment was the first conducted by the Bureau of Reclamation since 2018. The high-flow releases are meant to mimic natural flooding that would normally carry the sediment downstream. That drop-off in sand has led to a significant reduction in the number and size of sandbars in the Colorado River, areas that are frequented by campers and rafters and are considered important habitats for aquatic and bird species. Since construction on Glen Canyon Dam was completed in 1963, the amount of sand that flows into the Grand Canyon has been reduced by more than 90 percent, according to the United States Geological Survey. “While there are small changes in the orientation of shadows between the two images, most of the changes visible in the river are due to higher water levels associated with the high-flow experiment,” the agency said in a news release. The before and after photos published by the NASA Earth Observatory show subtle yet significant shifts in the amount and location of sand buildup along the stretch of the river below Lake Powell’s Glen Canyon Dam as it meanders through Horseshoe Bend and Marble Canyon. That is far above the dam’s typical releases, which range from 8,000 to 25,000 cubic feet per second. ![]() Thanks to the watchful eye of NASA’s Landsat 8 and Landsat 9 satellites, we can now see just how much change that deluge brought to the river.Īfter one of the West’s wettest winters in years, the Bureau of Reclamation conducted what it calls a “High Flow Experiment” between April 24 and 27 by releasing up to 39,500 cubic feet of water per second from the dam over a 72-hour period. Bureau of Reclamation released a torrent of water from Glen Canyon Dam last month as a way of shoring up the sandbars and beaches along the Colorado River. The Glen Canyon Dam with Colorado River flowing out below on Tuesday, April 18, 2023, in Page, AZ. ![]()
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