20061020

Take the long view:
Earth from four billion miles away

"This narrow-angle color image of the Earth, dubbed 'Pale Blue Dot', is a part of the first-ever 'portrait' of the solar system taken by Voyager 1 on Feb. 14, 1990.

"The spacecraft acquired a total of 60 frames for a mosaic of the solar system from a distance of more than four billion miles from Earth and about 32 degrees above the ecliptic. From Voyager's great distance Earth is a mere point of light, less than the size of a picture element even in the narrow-angle camera. Earth was a crescent only 0.12 pixel in size. Coincidentally, Earth lies right in the center of one of the scattered light rays that resulted from the image been taken while the planet was relatively close to the Sun."

Voyager 1 is now just about beyond the realm of the Sun's influence, in a region called the heilosheath. Much earlier in the spacecraft's journey...


"This picture of a crescent-shaped Earth and Moon -- the first of its kind ever taken by a spacecraft -- was recorded Sept. 18, 1977, by NASA's Voyager 1 when it was 7.25 million miles (11.66 million kilometers) from Earth... Because the Earth is many times brighter than the Moon, the Moon was artificially brightened by a factor of three relative to the Earth, so that both bodies would show clearly in the image."