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Welcome Fall! Autumn Equinox Is SaturdayFall begins at exactly 6:49 a.m. EDT on Sept. 22.
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Greenland's Small, but Menacing IcebergsThese glaciers are smaller than Antarctica's, but more dangerous to ships.
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Images: Summer Comes to Canada's Hudson BayArctic sea ice recedes as summer begins.
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Satellite Spies Sunny Skies over Pacific NorthwestClear skies reveal Rockies, Cascades and other features of the western landscape.
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Satellite Spies New Lava Flow on Active VolcanoBogana volcano is almost constantly active but its remoteness makes it hard to monitor.
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Earth As Art: Algae & A Dry LakebedEtosha Pan in Namibia rarely receives the water that flows down its tributaries.
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Spring's Greening Seen from SpaceSatellites see greening of trees.
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Earth As Art: Swirling Ice FloesEddy currents push around small icebergs.
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Amazing NASA Video Shows Fall Equinox from SpaceWatch this amazing animation of equinoxes and solstices from space.
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Norway Seeks to Reclaim South Pole Explorer's ShipwreckInvestors want to float shipwreck back to Norway.
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Bloom Colors Barents SeaBlues and greens explode.
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Arctic Cruise to Examine Ocean's Changing ChemistryAcidic oceans could be bad news for marine life.
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Huge Ice Island Drifts Farther SouthIce chunk broke off of Greenland glacier nearly one year ago.
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In Images: NASA's Mission to Arctic Frontier
Second leg of voyage to study changing waters of the Arctic Ocean.
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Arctic Landscape Anything But BoringMelt ponds add variation to stretches of sea ice.
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Expedition Sets Sail to Plumb Arctic DepthsUpdated charts needed as sea ice loss drives increase in ship traffic.
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Largest Arctic Iceberg in 50 Years SpottedIceberg has traveled nearly 2,000 miles in Arctic waters.
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Massive Japan Tsunami Topped 130 FeetStill not even close to the biggest tsunami ever.
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Weird Mini Tsunami Hits EnglandThe wave swept ashore, surprising holidaymakers and fishermen alike.
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NASA to Go Boldly ... to the Arctic, Again
Second leg of the mission begins June 25.
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What Gave Deadly Sumatra Tsunami Its Extra PowerUnusually thick, strong sediments allowed quake to move more seafloor.
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Mammoth Caves: Largest Cave System on EarthCaves carved by water over eons.
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Tsunami Flooded Japanese RiverOcean waters, debris overflowed river and inundated croplands.
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Japan Tsunami Touched All New Zealand Coastline
Waves recorded across country's entire coast.
