Welcome Fall! Autumn Equinox Is Saturday By OurAmazingPlanet Staff Fall begins at exactly 6:49 a.m. EDT on Sept. 22.
Greenland's Small, but Menacing Icebergs By OurAmazingPlanet Staff These glaciers are smaller than Antarctica's, but more dangerous to ships.
Images: Summer Comes to Canada's Hudson Bay By OurAmazingPlanet Staff Arctic sea ice recedes as summer begins.
Satellite Spies Sunny Skies over Pacific Northwest By OurAmazingPlanet Staff, NASA Clear skies reveal Rockies, Cascades and other features of the western landscape.
Satellite Spies New Lava Flow on Active Volcano By OurAmazingPlanet Staff, NASA Report Bogana volcano is almost constantly active but its remoteness makes it hard to monitor.
Earth As Art: Algae & A Dry Lakebed By OurAmazingPlanet Staff, NASA Etosha Pan in Namibia rarely receives the water that flows down its tributaries.
Where Has Japan Tsunami Debris Gone? By OurAmazingPlanet Staff Computer models, buoys track its progress.
Amazing NASA Video Shows Fall Equinox from Space By OurAmazingPlanet Staff Watch this amazing animation of equinoxes and solstices from space.
Norway Seeks to Reclaim South Pole Explorer's Shipwreck By OurAmazingPlanet Staff Investors want to float shipwreck back to Norway.
Arctic Cruise to Examine Ocean's Changing Chemistry By OurAmazingPlanet Staff Acidic oceans could be bad news for marine life.
Huge Ice Island Drifts Farther South By OurAmazingPlanet Staff Ice chunk broke off of Greenland glacier nearly one year ago.
In Images: NASA's Mission to Arctic Frontier By OurAmazingPlanet Staff Second leg of voyage to study changing waters of the Arctic Ocean.
Arctic Landscape Anything But Boring By OurAmazingPlanet Staff Melt ponds add variation to stretches of sea ice.
Expedition Sets Sail to Plumb Arctic Depths By OurAmazingPlanet Staff Updated charts needed as sea ice loss drives increase in ship traffic.
Largest Arctic Iceberg in 50 Years Spotted By OurAmazingPlanet Staff Iceberg has traveled nearly 2,000 miles in Arctic waters.
Massive Japan Tsunami Topped 130 Feet By OurAmazingPlanet Staff Still not even close to the biggest tsunami ever.
Weird Mini Tsunami Hits England By OurAmazingPlanet Staff The wave swept ashore, surprising holidaymakers and fishermen alike.
NASA to Go Boldly ... to the Arctic, Again By OurAmazingPlanet Staff Second leg of the mission begins June 25.
What Gave Deadly Sumatra Tsunami Its Extra Power By OurAmazingPlanet Staff Unusually thick, strong sediments allowed quake to move more seafloor.
Mammoth Caves: Largest Cave System on Earth By OurAmazingPlanet Staff Caves carved by water over eons.
Tsunami Flooded Japanese River By OurAmazingPlanet Staff Ocean waters, debris overflowed river and inundated croplands.