Polar bears and brown bears have interbred opportunistically and probably on many occasions during the last 100,000 years. An international research team concluded that all living polar bears trace their maternal ancestor to a brown bear that lived near present-day Britain and Ireland just prior to the last ice age. The research team analyzed 242 brown bear and polar bear mitochondria...
Coexistence of plant and insect species News.science360.gov.org
A silhouette of a monarch caterpillar (Danaus plexippus) on the leaf of a milkweed plant (Asclepias spp.). Plant-eating insects such as caterpillars have played a central role in the evolution of plants. Scientists are studying these organisms as part of their research on the community and evolutionary ecology of interactions between the milkweed plant and the insect herbivores that p...
Photographer: David K. Lynch
Summary Author: David K. Lynch
Nabkhas are eolian sand dunes formed when plants catch and accumulate wind-borne soil. They're called phytogenic mounds (phytogenic means originating from plants) and they're most common in desert and semiarid regions. Nabkhas are typically 3 ft to 16 ft (1-5 m) high and 30 ft to 200 ft (9-61 m) across. They're the only kind of dunes ...
Archive - Central Pennsylvania Folded Rocks Epod.usra.edu
Each Sunday we present a notable item from our archives. This EPOD was originally published May 27, 2004.
Provided by and copyright: Russell Agostaro, Newburgh Enlarged City School District
Summary author: Russell Agostaro
During the Permian Period (290 to 248 million years ago), the continental mass of what is now Africa collided with the continental mass of Laurentia, now known as North Amer...
Crossing Mars Apod.nasa.gov
Where is NASA's rover Curiosity going on Mars?
Contemplating the Sun Apod.nasa.gov
Have you contemplated your home star recently?
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Makemake is one of several dwarf planets that reside in the frigid outer realm of our solar system called the Kuiper Belt, a "junkyard" of countless icy bodies left over from our solar system's formation.
Hubble Sees a Star 'Inflating' a Giant Bubble Hubblesite.org
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Twenty-six candles grace NASA's Hubble Space Telescope's birthday cake this year, and now one giant space "balloon" will add to the festivities. Just in time for the 26th anniversary of Hubble's launch on April 24, 1990, the telescope has photographed an enormous, balloon-like bubble being blown into space by a super-hot, massive star. Astronomers trained the i...
NASA Earth Observatory Image of the Day
Lagoa Mangueira Earthobservatory.nasa.gov
Sand spits and other wind- and wave-built patterns distinguish the south coast of Brazil.
Biscayne National Park Earthobservatory.nasa.gov
Maps of the underwater topography reveal reefs and sandbars within the largest marine park in the U.S. National Park System.
NASA Earth Observatory Natural Hazards
Fires and Smoke in Nepal Earthobservatory.nasa.gov
In April 2016, smoke blanketed the region during an unusually active fire season.
Looking Through the Storm That Swamped Houston Earthobservatory.nasa.gov
CloudSat observed a destructive rain storm as it passed across the central United States in April 2016.
The average naked mole rat is between 3 to 4 inches (8 to 10 centimeters) in length and weighs between 1.1 and 1.2 ounces (30 to 35 grams). They have small eyes, poor...
Northern Pudu - the World's Smallest Deer Thewebsiteofeverything.com