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posted by Fnord666 on Saturday February 15 2020, @07:30PM   Printer-friendly
from the it's-all-about-perspective dept.

Voyager 1's Pale Blue Dot (1990)

Voyager 1's Pale Blue Dot (1990):

The Pale Blue Dot is a photograph of Earth taken Feb. 14, 1990, by NASA’s Voyager 1 at a distance of 3.7 billion miles (6 billion kilometers) from the Sun. The image inspired the title of scientist Carl Sagan's book, "Pale Blue Dot: A Vision of the Human Future in Space," in which he wrote: "Look again at that dot. That's here. That's home. That's us."

[...] Voyager 1 was speeding out of the solar system — beyond Neptune and about 3.7 billion miles (6 billion kilometers) from the Sun — when mission managers commanded it to look back toward home for a final time. It snapped a series of 60 images that were used to create the first “family portrait” of our solar system.

The picture that would become known as the Pale Blue Dot shows Earth within a scattered ray of sunlight. Voyager 1 was so far away that — from its vantage point — Earth was just a point of light about a pixel in size.

NASA Remasters Voyager 1's Famous 'Pale Blue Dot' Image, Puts Earth in Perspective

NASA remasters Voyager 1's famous 'Pale Blue Dot' image, puts Earth in perspective:

Earth occupies a tiny speck of space in a wide, wild universe. NASA's Voyager 1 spacecraft gifted us with a mind-altering perspective on our planet back on Feb. 14, 1990, when it snapped a distant picture of home.

The haunting view shows Earth as a tiny spot with sun rays dashing across the frame. The spacecraft, which launched in 1977, was 3.7 billion miles (6 billion kilometers) from the sun at the time.

In honor of the 30th anniversary of the image, NASA revisited the picture that became known as the "Pale Blue Dot." "The updated image uses modern image-processing software and techniques while respecting the intent of those who planned the image," said NASA on Wednesday.

[...] The "Pale Blue Dot" moniker came from astronomer Carl Sagan and his 1994 book of the same name. "That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives," Sagan wrote.

Pale Blue Dot Revisited

Pale Blue Dot Revisited:

For the 30th anniversary of one of the most iconic images taken by NASA's Voyager mission, NASA has created a new version of the image known as "the Pale Blue Dot."

Planet Earth is visible as a bright speck within the sunbeam just right of center and appears softly blue, as in the original version published in 1990 (see PIA00452).

This updated version uses modern image-processing software and techniques to revisit the well-known Voyager view while attempting to respect the original data and intent of those who planned the images.

[...] The image of Earth was originally published by NASA in 1990. It is republished here to commemorate the 30th anniversary of the Family Portrait of the Solar System (see PIA00451) and the Pale Blue Dot image in particular.

The planet occupies less than a single pixel in the image and thus is not fully resolved. (The actual width of the planet on the sky was less than one pixel in Voyager's camera.) By contrast, Jupiter and Saturn were large enough to fill a full pixel in their family portrait images.

The direction of the Sun is toward the bottom of the view (where the image is brightest). Rays of sunlight scattered within the camera optics stretch across the scene. One of those light rays happens to have intersected dramatically with Earth. From Voyager 1's vantage point — a distance of approximately 3.8 billion miles (6 billion kilometers) — Earth was separated from the Sun by only a few degrees. The close proximity of the inner planets to the Sun was a key factor preventing these images from being taken earlier in the mission, as our star was still close and bright enough to damage the cameras with its blinding glare.

The view is a color composite created by combining images taken using green, blue and violet spectral filters by the Voyager 1 Narrow-Angle Camera. They were taken at 4:48 GMT on Feb. 14, 1990, just 34 minutes before Voyager 1 powered off its cameras forever.


Original Submission #1Original Submission #2Original Submission #3

 
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  • (Score: 0) by Anonymous Coward on Sunday February 16 2020, @12:02AM

    by Anonymous Coward on Sunday February 16 2020, @12:02AM (#958632)

    "The picture that would become known as the Pale Blue Dot shows Earth within a scattered ray of sunlight."