A day in the life of Earth, as seen from a million miles away through the lens of NASA’s Earth Polychromatic Imaging Camera, affixed to NOAA’s Deep Space Climate Observatory. Distance: 981,266 miles
The primary objective of DSCOVR, a partnership between NASA, the National Oceanic and Atmospheric Administration (NOAA) and the U.S. Air Force, is to maintain the nation’s real-time solar wind monitoring capabilities, which are critical to the accuracy and lead time of space weather alerts and forecasts from NOAA.
For more information about DSCOVR, visit:
Earth Polychromatic Imaging Camera (EPIC)
NASA has contributed two Earth science instruments for NOAA's space weather observing satellite called the Deep Space Climate Observatory or DSCOVR. One of the instruments called EPIC or Earth Polychromatic Imaging Camera images the Earth in one picture, something that hasn't been done before from a satellite. EPIC also provides valuable atmospheric data.
Previously, to get an entire Earth view, scientists had to piece together images from satellites in orbit. With the launch of the National Oceanic and Atmospheric Administration's (NOAA) DSCOVR and the EPIC instrument, scientists get pictures of the entire sunlit side of Earth. To get that view, EPIC orbits the first sun-Earth Lagrange point (L1), 1 million miles from Earth. At this location, four times further than the orbit of the Moon, the gravitational pull of the sun and Earth cancel out providing a stable orbit for DSCOVR. Most other Earth-observing satellites circle the planet within 22,300 miles.
EPIC assembles its photograph-like views by combining information from the instrument’s red, green, and blue bands. Bands are narrow regions of the electromagnetic spectrum to which a remote sensing instrument responds. When EPIC collects data, it takes a series of 10 images at different bands—from ultraviolet to near infrared.
The effective resolution of the EPIC camera is somewhere between 10 and 15 kilometers (6 to 9 miles) per pixel, according to Adam Szabo, DSCOVR project scientist at NASA’s Goddard Space Flight Center. Since Earth is extremely bright compared to the darkness of space, the exposure time for images is as little as 20 to 100 milliseconds. The much fainter stars in the background are not visible because of this short exposure time.
You can view those images daily by clicking here:
All images are public domain.
Image Date: Sept. 4, 2016
#NASA #NOAA #Spacex #Space #Satellite #Earth #DSCOVR #Solar #Sun #SolarWind #Weather #Science #Climate #DeepSpace #Observatory #EPIC #USAF #AirForce #Military #Orbit #Lagrange #AlGore #Animation #GIF
I knew the Falcon 9 was 70 meters tall, but this photo really shows the scale
How gravitational waves went from a whisper to a shout
- Had LIGO just confirmed a 100-year-old prediction made by Einstein? Had they discovered the first black hole binary? Had they opened a new era of astrophysics? With the stakes so high, the collaborators wanted to keep their results secret while they determined if the results were real. It was unfortunate that some onlookers chose to publicize vague rumors when the internal vetting had just begun - written by Robert Garisto
read article here:
- image source: #Nasa : What are Gravitational waves? Gravitational waves are disturbances in space-time, the very fabric of the universe, that travel at the speed of light. The waves are emitted by any mass that is changing speed or direction. The simplest example is a binary system, where a pair of stars or compact objects (like black holes) orbit their common center of mass. http://nasa.tumblr.com/post/139124558019/what-are-gravitational-waves
- University of TennesseeElectrical Engineering, 2015 - present
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