الخميس، 26 يناير 2012

Pale Blue Dots: Iconic Images of Earth From Space

Rosetta Earth moon

Dozens of cameras circle Earth to document the planet in detail, but few ever afford whole views of our world.
The handful of rare glimpses have demonstrated that “Earth is a very small stage in a vast cosmic arena,” wrote the late Carl Sagan in Pale Blue Dot: A Vision of the Human Future in Space.
Robotic probes take most photos of Earth and the moon while en route to planets, asteroids, comets and even other star systems. But the practice of taking planetary self-portraits is almost never artistically motivated.
“We generally do it to calibrate instruments and check a spacecraft’s trajectory. If you point where you think the Earth is and see it, then you’re probably where you think you are,” said planetary scientist Mark Sykes of the Planetary Science Institute.
“But now, as we continue to find other planets, these general views help us look at the Earth in new ways,” Sykes said. “They help us ask, ‘What does a habitable planet look like? What indicates a civilization is there?’”
In this gallery we cover some of the most iconic images of our pale blue dot taken by both robots and humans.
Above:

Rosetta

The European Space Agency launched the Rosetta spacecraft in 2004 to land a probe on comet 67P/Churyumov–Gerasimenko in November 2014.
When it swung by Earth for its third and final gravity boost on Nov. 12, 2009, Rosetta took a series of photos of the Earth. The outline of Antarctica is visible in the bottom portion of the planet.
Image: ESA/MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA [high-resolution version]

Lunar Orbiter I Earth moon

Lunar Orbiter 1

This first-ever view of the Earth from around the moon was taken by the United States’ first Lunar Orbiter spacecraft on Aug. 23, 1966.
Four more spacecraft followed suit to help Apollo mission managers map 99 percent of the lunar surface and select potential landing sites for future manned excursions. Decades later in 2008, the Lunar Orbiter Image Recovery Project began releasing dramatically restored versions of the images (below).

Images: 1) NASA [high-resolution version] 2) NASA/LOIRP [high-resolution version]

Apollo 8 Earth lunar orbit

Apollo Missions

Apollo 8 was the first manned mission to reach and orbit the moon. As Frank Borman, Jim Lovell and William Anders read passages from the Bible during a live broadcast on Dec. 24, 1968, NASA aired the first “earthrise” photo to the public.
The iconic “blue marble” image below — now a mainstay on iPhone home screens — was taken on Dec. 7, 1972 as Apollo 17 astronauts sped toward the moon.

Images: NASA 1) [high-resolution version] 2) [high-resolution version]

Mariner 10 Earth moon

Mariner 10 and Galileo

About 12 hours after Mariner 10 launched from Earth on Nov. 3, 1973, mission managers turned on its cameras and aimed them homeward. Although the moon appears close to Earth in the above photo, it is an illusion of alignment and distance. (Our lunar satellite orbits from about 239,000 miles away.)
The Galileo spacecraft, launched in 1989, took a similar photo of Earth from 3.9 million miles away as it sped toward Jupiter and that planet’s moons.

Images: 1) NASA/JPL/Northwestern University [high-resolution version] 2) NASA [high-resolution version]

Voyager 1 Earth moon

Voyager 1

NASA launched the Voyager 1 spacecraft on Aug. 20, 1977 to document the planets Jupiter and Saturn, but not before it took the image above of Earth and the moon on Sept. 18, 1977.
The portrait was not its last. Some 4 billion miles from Earth on Feb. 14, 1990 the spacecraft took the image below, showing the planet as a tiny speck. (The colored bands are scattered sunlight.)
Voyager 1 and its twin Voyager 2 are still operational today at the edge of the solar system.

Images: NASA 1) [high-resolution version] 2) [high-resolution version]

Clementine Earth moon

Clementine

As NASA’s Clementine spacecraft orbited the moon in 1997, it took this image of the Earth over the lunar north pole.
Image: U.S. Geological Survey/NASA [high-resolution version]

NEAR Earth moon

NEAR

To reach asteroid 433 Eros, NASA’s Near Earth Asteroid Rendezvous Spacecraft, or NEAR, had to swing by our home planet on Jan. 23, 1998. The south poles of the Earth and moon are visible in this shot.
Image: NASA [high-resolution version]

Juno Earth moon

Juno

It doesn’t look like much, but this view of the Earth (left) and the moon (right) clearly show the respectable distance between the two bodies. NASA’s Jupiter-bound Juno spacecraft took the image on Aug. 26, 2011 from 6 million miles away.
Image: NASA/JPL-Caltech [high-resolution version]

Spirit Mars Rover Earth

Spirit Mars Exploration Rover and Mars Global Surveyor

NASA’s Spirit Mars Exploration Rover took the above twilight shot of the Earth from the surface of Mars in 2004. Below, the Mars Global Surveyor offers a view of Earth and the moon from Martian orbit on May 8, 2003.

Images: 1) NASA/JPL-Caltech/Cornell/Texas A&M [high-resolution version] 2) NASA/JPL/Malin Space Science Systems [high-resolution version]

Cassini Saturn rings Earth

Cassini

The Cassini spacecraft recorded this sun-facing shot from behind Saturn. The Earth appears as a small speck through the gas giant’s rings.

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