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| | Scientists solve a methane puzzle | | Since 2006, levels of heat-trapping methane in Earth's atmosphere have risen sharply. A new study settles a disagreement about the source. | | | | Tonight … See the Double Cluster | | First, find the M- or W-shaped constellation Cassiopeia. The Double Cluster - 2 open star clusters - is nearby and beautiful in a dark sky. | | | | | |
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| | | See the Double Cluster | Just above Cassiopeia, assuming your sky is dark, you'll see a faint fuzzy patch. This is the Double Cluster, which blooms into a sparkling array of stars through binoculars or a small backyard telescope. | | | | |
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| | Volcán de Fuego from Earth and space | February 1 satellite image – in natural color – of a burst from Volcán de Fuego, one of central America's most active volcanos. Ash in a volcanic plume typically appears brown or gray in space images, while steam appears white. Image via Landsat 8. | | |
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