Lake Atna filled the Copper River valley from about 60,000 to 10,000 years ago. Glennallen, Copper Center and Gulkana were underwater then, in the depths of a water body twice the size of the Great Salt Lake. 

Ned Rozell
Small mammals such as shrews, voles, mice and lemmings will likely shift their distribution across Alaska in coming decades as the climate warms, with some species gaining ground and others losing out, a new study says.Yereth Rosen
While snorkeling in Alaska’s largest lake, Stephanie Carlson watched sockeye salmon change from aggressive red creatures with the jaws of wolves to drab, lethargic slugs. That conversion was so quick that she wondered if fish that fall apart faster have some advantage over fish that linger.Ned Rozell
The Perseid meteor shower, widely regarded as the best meteor shower of the year, will peak this week and be visible to many in Alaska after midnight and through the pre-dawn hours.Jeannette Lee Falsey
One of the quietest places in Alaska was temporarily home to a few hardy people when the Mayflower landed at Plymouth Rock. An archaeologist has fleshed out what life might have been like during a winter on St. Matthew Island in the 1600s.Ned Rozell
The world’s glaciers are retreating at a faster rate than any time in recorded history, according to a new study published online in the Journal of Glaciology.Asaf Shalev
Arctic sea ice in August melted faster than usual, putting 2015 on pace to be the year with the third- or fourth lowest ice extent on record. The faster rate means Canada's M'Clure Strait passage may be open this year for the first time since 2007.Kamala Kelkar
A Palmer-based company used an unmanned boat to perform bathymetry surveys in support of NOAA efforts to create navigational charts in Alaska's Arctic waters.Carey Restino | Arctic Sounder
President Obama is in legacy mode but also in bucket-list mode, increasingly determined to use his remaining 15 months in office to do and see spectacular things. These days, when Obama’s policy agenda overlaps with an irresistible sightseeing opportunity, he grabs it. Julie Hirschfeld Davis | The New York Times
Denali, the Alaska mountain formerly known as Mount McKinley, now measures 20,310 at its highest point in a new official elevation the U.S. Geological Survey announced Wednesday. Rachel D'Oro | Associated Press