Astronomy
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Foto Bumi dari Citra Satelit Landsat
July 22, 2012
Selama 40 tahun terakhir, program pengamatan satelit
Landsat merekam berbagai perubahan detail yang terjadi di permukaan
Bumi.
Berikut adalah beberapa gambar-gambar Bumi seperti diambil citra
Landsat.
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In the style of Van Gogh's
painting "Starry Night," massive congregations of greenish phytoplankton
swirl in the dark water around Gotland, a Swedish island in the Baltic
Sea. Population explosions, or blooms, of phytoplankton, like the one
shown here, occur when deep currents bring nutrients up to sunlit
surface waters, fueling the growth and reproduction of these tiny
plants.
(Credit: NASA Goddard Space Flight Center/USGS) |
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Countless lakes, sloughs, and
ponds are scattered throughout this scene of the Yukon Delta in
southwest Alaska. One of the largest river deltas in the world, and
protected as part of the Yukon Delta National Wildlife Refuge, the
river's sinuous waterways seem like blood vessels branching out to
enclose an organ. (Credit: NASA Goddard Space Flight Center/USGS)
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What look like pale yellow paint
streaks slashing through a mosaic of mottled colors are ridges of
wind-blown sand that make up Erg Iguidi, an area of ever-shifting sand
dunes extending from Algeria into Mauritania in northwestern Africa. Erg
Iguidi is one of several Saharan ergs, or sand seas, where individual
dunes often surpass 500 meters (nearly a third of a mile) in both width
and height.
(Credit: NASA Goddard Space Flight Center/USGS) |
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The scary face in this image is
actually inundated patches of shallow Lake Eyre (pronounced "air") in
the desert country of northern South Australia. An ephemeral feature of
this flat, parched landscape, Lake Eyre is Australia's largest lake when
it's full. However in the last 150 years, it has filled completely only
three times.
(Credit: NASA Goddard Space Flight Center/USGS) |
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Small, blocky shapes of towns,
fields, and pastures surround the graceful swirls and whorls of the
Mississippi River, the largest river system in North America. Countless
oxbow lakes and cutoffs accompany the meandering river south of Memphis,
Tennessee, on the border between Arkansas and Mississippi.
(Credit: NASA Goddard Space Flight Center/USGS) |
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