The Blue Marble

For other uses, see Blue Marble (disambiguation).
The Blue Marble—Earth as seen by Apollo 17 in 1972

The Blue Marble is a photograph of the Earth, taken on December 7, 1972, by the crew of the Apollo 17 spacecraft, at a distance of about 45,000 kilometers (28,000 miles). It is one of the most reproduced images in human history.[1][2]

The image with the official NASA designation AS17-148-22727 reproduces the view of the Earth as seen by the Apollo crew traveling toward the Moon. The translunar coast photograph extends from the Mediterranean Sea to Antarctica. This was the first time the Apollo trajectory made it possible to photograph the south polar ice cap, despite the Southern Hemisphere being heavily covered in clouds. In addition to the Arabian Peninsula and Madagascar, almost the entire coastline of Africa is clearly visible. The Asian mainland is on the horizon.

The name has also been applied by NASA to a 2012 series of image data sets covering the entire globe at relatively high resolution, created by carefully sifting through satellite-captured sequences taken over time, to eliminate as much cloud cover as possible from the collated set of images.

The photograph

The photograph, taken by astronauts on December 7, 1972, at 5:39 a.m. EST (10:39 UTC), is one of the most widely distributed photographic images in existence.[2] The image is one of the few to show an almost fully illuminated Earth disk, as the astronauts had the Sun behind them when they took the image. To the astronauts, the slightly gibbous Earth had the appearance and size of a glass marble, hence the name.

History

The photograph was taken about 5 hours and 6 minutes after launch of the Apollo 17 mission,[3] and about 1 hour 54 minutes after the spacecraft left its parking orbit around the Earth, to begin its trajectory to the Moon. The time of Apollo 17's launch, 12:33 a.m. EST, meant that Africa was in daylight during the early hours of the spacecraft's flight. With the December solstice approaching, Antarctica was also illuminated.

The 1972 Tamil Nadu cyclone can be seen in the top right of the image. This storm had brought flooding and high winds to the Indian state of Tamil Nadu on December 5, two days before the photograph was taken.[4]

The photograph's official NASA designation is AS17-148-22727. NASA photograph AS17-148-22726, taken just before and nearly identical to 22727, is also used as a full-Earth image.[5]

The photographer used a 70-millimeter Hasselblad camera with an 80-millimeter Zeiss lens.[6][7] NASA credits the image to the entire Apollo 17 crew—Eugene Cernan, Ronald Evans and Jack Schmitt—all of whom took photographs during the mission with the on-board Hasselblad, although evidence examined after the mission suggests that Jack Schmitt was the photographer.[2]

Apollo 17 was the last manned lunar mission. No human since has been far enough from Earth to photograph a whole-Earth image such as The Blue Marble, but whole-Earth images have been taken by many unmanned spacecraft missions.

The Blue Marble was not the first clear image taken of an illuminated face of the Earth, since similar shots from the ATS-3 satellite had already been made as early as 1967.[8] The Apollo 17 image, however, released during a surge in environmental activism during the 1970s, became a symbol of the environmental movement, as a depiction of Earth's frailty, vulnerability, and isolation amid the vast expanse of space.[1] NASA archivist Mike Gentry has speculated that The Blue Marble is among the most widely distributed images in human history.[2]

Subsequent Blue Marble images

Subsequent similar images of Earth (including composites at much higher resolution) have also been termed Blue Marble images, and the phrase "blue marble" (as well as the picture itself) is frequently used, as in the Earth flag by environmental activist organizations or companies attempting to promote an environmentally conscious image. In addition, there has also been a children's television program called Big Blue Marble. Poet-diplomat Abhay K has penned an Earth Anthem inspired by the blue marble which contains "all the peoples and the nations of the world, one for all, all for one, united we unfurl the blue marble flag".[9]

Imaging series 2001–2004

Blue Marble composite images generated by NASA in 2001 and 2002.
NASA Earth Observatory animation of Blue Marble Next Generation (2004).[10]

In 2002, NASA released an extensive set of satellite-captured imagery, including prepared images suitable for direct human viewing, as well as complete sets suitable for use in preparing further works.[11] At the time, 1 km/pixel was the most detailed imagery available for free, and permitted for reuse[12] without a need for extensive preparatory work to eliminate cloud cover and conceal missing data, or to parse specialized data formats. The data also included a similarly manually assembled cloud-cover and night-lights image sets, at lower resolutions.

A subsequent release was made in 2005, named Blue Marble Next Generation.[13] This series of photo mosaics was produced with the aid of automated image-sifting upon images from NASA's Earth Observatory, which enabled the inclusion of a complete, cloud-free globe for each month from January to December 2004, at even higher resolution (500 m/pixel).[14] The original release of a single-image set covering the entire globe could not reflect the extent of seasonal snow-and-vegetative cover across both hemispheres, but this newer release closely modeled the changes of the seasons.

A number of interactive viewers for these data have also been released, among them a music visualization for the PS3 that is based on the texture data.[15][16]

Blue Marble 2012

Blue Marble 2012 – a composite satellite image

On 25 January 2012, NASA released a composite image of the western hemisphere of Earth entitled Blue Marble 2012. The picture was widely viewed, logging over 3.1 million views on the Flickr image hosting website within the first week of release.[17] On 2 February 2012, NASA released a companion to this new Blue Marble, showing a composite image of the eastern hemisphere from data obtained on 23 January 2012.[18]

The picture is composed of data obtained by the Visible/Infrared Imager Radiometer Suite (VIIRS) instrument on board the Suomi NPP satellite on 4 January 2012.[18][19] The data was obtained from six orbits of the Earth by the Suomi NPP over an eight-hour period.[18]

Black Marble 2012

Black Marble – North and South America at night[20]

On December 5, 2012, NASA released a nighttime view of Earth called Black Marble[20] during an annual meeting of Earth scientists held by the American Geophysical Union in San Francisco.[21] The images display all the human and natural matter that glows and can be detected from space.[22] The data was acquired by the Suomi NPP satellite in April and October 2012 and then mapped over existing Blue Marble imagery of Earth to provide a realistic view of the planet.[23] The Suomi NPP satellite completed 312 orbits and gathered 2.5 terabytes of data to get a clear shot of every parcel of the Earth’s land surface. Named for satellite meteorology pioneer Verner Suomi, the satellite flies over any given point on Earth’s surface twice each day and flies 512 miles above the surface in a polar orbit.[24]

The nighttime views were obtained with the new satellite's "day-night band" of the Visible Infrared Imaging Radiometer Suite (VIIRS), which detects light in a range of wavelengths from green to near-infrared, and uses filtering techniques to observe dim signals such as city lights, gas flares, auroras, wildfires, and reflected moonlight. Auroras, fires, and other stray light have been removed in the case of the Black Marble images to emphasize the city lights.[23] The images have been used to study the spatial distribution of economic activity, to select sites for astronomical observatories, and to monitor human activities around protected areas.[23]

DSCOVR

The Moon moving in front of the Blue Marble in July 2016

On July 21, 2015, NASA released a new Blue Marble photograph taken by a U.S. Deep Space Climate Observatory (DSCOVR), a solar weather and Earth observation satellite which was launched in February 2015 and will provide a near-continuous view of the entire sunlit-side of the Earth. The image was taken on July 6, 2015.[25] The photograph, of the Western Hemisphere, is centered over Central America. The Western United States, Mexico and the Caribbean are visible, but much of South America is hidden beneath cloud cover. Greenland can be seen at the upper edge of the image.

The EPIC science team plans to upload 12 new color images per day on their website. The color balance has been adjusted to approximate an image that could be seen with the average human eye. In addition to images, scientific information will be uploaded as it becomes available after in-flight calibration is complete. The science information will be ozone and aerosol amounts, cloud reflectivity, cloud height, and vegetation information. The EPIC instrument views the Earth from sunrise in the west to sunset in the east 12 to 13 times per day as the Earth rotates at 15 degrees of longitude per hour. Clearly visible are storms forming over the Atlantic and Pacific Oceans, major slowly moving "cloud rivers", dust aerosol plumes from Africa, the sun's reflection in the oceans, ship exhaust tracks in the clouds, rivers and lakes, and the variegated land surface patterns especially in the African deserts. The spatial resolution of the color images is about 10 km, and the resolution of the science products will be about 20 km. Once every three months, lunar images are obtained that are the same as those viewed from Earth during our full Moon. On occasion, the other side of the Moon will appear in the Earth images as the Moon crosses in front of the Earth.

See also

References

  1. 1 2 Petsko, Gregory A (2011). "The blue marble". Genome Biology. 12 (4): 112. doi:10.1186/gb-2011-12-4-112.
  2. 1 2 3 4 "Apollo 17: The Blue Marble". ehartwell.com. 2007-04-25. Archived from the original on January 9, 2008. Retrieved 2008-01-18.
  3. ↑ "Apollo 17 Image Library". Apollo 17 Multimedia. NASA. Retrieved 2007-04-29.
  4. ↑ "History of Past Cyclones". Indian Meteorological Department. Retrieved 2011-09-16.
  5. ↑ "Worth a thousand worlds". Geek Trivia. TechRepublic. 2005-12-06. Retrieved 2007-06-23.
  6. ↑ http://history.nasa.gov/alsj/a11/a11-hass.html
  7. ↑ NASA Mapping Sciences Branch (May 1974). Apollo 17 Index: 70 mm, 35 mm, and 16 mm Photographs. pp. 88. PDF.
  8. ↑ "ATS-III Image Collection – Images of the Earth taken from November 1967 till March 1969". Schwerdtfeger Library – ATS-III. Retrieved 1 July 2015.
  9. ↑ An Anthem for the Earth The Kathmandu Post, May 25, 2013
  10. ↑ Also see interactive SVG map from January to December 2004 on wiki commons
  11. ↑ "Blue Marble : Feature Articles". Earthobservatory.nasa.gov. 2005-10-13. Retrieved 2009-12-07.
  12. ↑ Christoph Hormann (2007-05-30). "Christoph's page — Earth — early renders". Imagico.de. Retrieved 2009-12-07.
  13. ↑ Blue Marble Next Generation Project
  14. ↑ Blue Marble Next Generation at NASA's Earth Observatory
  15. ↑ Gamasutra – Special: Q-Games On PS3's 'Gaia' Music Visualizer
  16. ↑ Blue Marble Next Generation : Feature Articles on Earthobservatory.nasa.gov
  17. ↑ Kuring, Norman. "Most Amazing High Definition Image of Earth — Blue Marble 2012". NASA. Retrieved 12 February 2012.
  18. 1 2 3 NASA. "VIIRS Eastern Hemisphere Image — Behind the Scenes". NASA. Retrieved 12 February 2012.
  19. ↑ Kuring, Normar. "Blue Marble". NASA. Retrieved 12 February 2012.
  20. 1 2 "NASA-NOAA Satellite Reveals New Views of Earth at Night". NASA. Retrieved 9 December 2012.
  21. ↑ "NASA Photos Show 'Black Marble' Earth at Night". ABC News. 5 December 2012. Retrieved 9 December 2012.
  22. ↑ Samenow, Jason (5 December 2012). "Satellites unveil Black Marble and spy on the moon". The Washington Post. Retrieved 9 December 2012.
  23. 1 2 3 "Black Marble – Americas". NASA. Flickr. Retrieved 9 December 2012.
  24. ↑ "'Black Marble' images shine light upon a sleeping world". The Washington Post. 5 December 2012. Retrieved 9 December 2012.
  25. ↑ Lendino, Jamie. "Humanity gets a new Blue Marble photo of Earth — and it's stunning". Extreme Tech. Retrieved 23 July 2015.

External links

Wikimedia Commons has media related to The Blue Marble.

1972 photograph

21st century NASA composite images

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