Astronomy news update from NASA : 
The best known asterism in northern skies hangs over the Canadian Rockies in this mountain and night skyscape taken last week from Banff National Park. But most remarkable is the amazing greenish airglow. With airglow visible to the eye, but not in color, the scene was captured in two exposures with a single camera, one exposure made while tracking the stars and one fixed to a tripod. Airglow emission is predominately from atmospheric oxygen atoms at extremely low densities. Commonly recorded in color by sensitive digital cameras the eerie, diffuse light is seen here in waves across the northern night. Originating at an altitude similar to aurorae, the luminous airglow is due to chemiluminescence, the production of light through chemical excitation and radiative decay. Energy for the chemical excitation is provided during daytime by the Sun's extreme ultraviolet radiation. Unlike aurorae which are limited to high latitudes, airglow can be found around the globe.
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The best known asterism in northern skies hangs over the Canadian Rockies in this mountain and night skyscape taken last week from Banff National Park. But most remarkable is the amazing greenish airglow. With airglow visible to the eye, but not in color, the scene was captured in two exposures with a single camera, one exposure made while tracking the stars and one fixed to a tripod. Airglow emission is predominately from atmospheric oxygen atoms at extremely low densities. Commonly recorded in color by sensitive digital cameras the eerie, diffuse light is seen here in waves across the northern night. Originating at an altitude similar to aurorae, the luminous airglow is due to chemiluminescence, the production of light through chemical excitation and radiative decay. Energy for the chemical excitation is provided during daytime by the Sun's extreme ultraviolet radiation. Unlike aurorae which are limited to high latitudes, airglow can be found around the globe.
from NASA https://ift.tt/2Rko3Jg
via IFTTT
Our new 'Word Of The Day' article update : fruitless , adj :
Bearing no fruit; barren. (figuratively) Unproductive, useless. (figuratively, archaic) Of a person: unable to have children; barren, infertile. (rare) Of a diet, etc.: without fruit.
Bearing no fruit; barren. (figuratively) Unproductive, useless. (figuratively, archaic) Of a person: unable to have children; barren, infertile. (rare) Of a diet, etc.: without fruit.
Here's A Perfect 8-Second Internet Video via Digg https://ift.tt/2PqESET
Hello, Information from NASA Media are invited to see a test version of NASA’s Orion spacecraft, as well as the hardware that will be used to recover the spacecraft on its return from space, at 9 a.m. PST Wednesday, Nov. 7, at Naval Base San Diego.
October 26, 2018
from NASA https://ift.tt/2z4JczA
October 26, 2018
from NASA https://ift.tt/2z4JczA
