The hackberry emperor (Asterocampa celtis) is a North American butterfly that belongs to the family of brushfooted butterflies, Nymphalidae. Hackberry butterflies fly in a fast and erratic manner, and rest upside down on tree trunks.
Image credit: Courtesy of USFWS
Scientists tackle mystery of nighttime thunderstorms News.science360.gov.org
Thunderstorms that form at night, without a spark from the sun's heat, are a mysterious phenomenon. From June 1 through July 15, 2015, researchers from across North America will fan out each evening across the Great Plains, where storms are more common at night than during the day. The effort, co-organized by numerous collaborating institutions, will use lab-equipped aircraft, ground-...
Photographer: Brian Barrett
Summary Author: Brian Barrett
This photograph was taken after a pair of perfectly straight contrails become distorted and twisted, and eventually broke into isolated rings. The initial contrails didn't result from exhaust contrails as would commonly be observed from high altitude aircraft. Nor were they vortex contrails as sometimes are seen from the wingtips of a pl...
Busy Sky Epod.usra.edu
Photographer: Constantine Emmanouilidi
Summary Author: Constantine Emmanouilidi
The photo above shows a busy sky over the Chalkidiki Peninsula of northeastern Greece. This composite image was taken from the summit of Mount Athos (6,660 ft or 2,030 m above sea level), facing north. It features a double pass of the International Space Station (left to right at bottom center), several Iridium flar...
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Astronomers have spent decades trying to determine the oddball behavior of an aging star nicknamed "Nasty 1" residing in our Milky Way galaxy. Nasty 1 was identified as a Wolf-Rayet star, a rapidly evolving star that is much more massive than our sun. The star loses its hydrogen-filled outer layers quickly, exposing its super-hot and extremely bright helium-burning...
Hubble Catches a Stellar Exodus in Action Epod.usra.edu
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Globular star clusters are isolated star cities, home to hundreds of thousands of stars. And like the fast pace of cities, there's plenty of action in these stellar metropolises. The stars are in constant motion, orbiting around the cluster's center. Past observations have shown that the heavyweight stars live in the crowded downtown, or core, and lightweight s...
NASA Earth Observatory Image of the Day
Drenching the South and Plains Epod.usra.edu
After years of drought, Texas, Oklahoma, and other states are now coping with persistent flooding rains.
Flooding of Dalton Highway Epod.usra.edu
The swollen Sag River has closed a trucking highway that connects Fairbanks to the Prudhoe Bay oil fields in far northern Alaska.
Hare - Easter bunny was a hare originally Thewebsiteofeverything.com
Today's photo features the inflorescence of Shepherdia canadensis, a common berry-producing shrub of western North America. Anne Elliott (aka annkelliott@Flickr) took this macro in South Glenmore Park, Calgary, Alberta. Thanks Anne!
Shepherdia canadensis, also known as soopalallie or buffaloberry, is an incredibly important species for grizzly bears (Ursus arctos). The online field guide, Moun...
Pycnostachys urticifolia BotanicalGarden.ubc.ca