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Crescent Neptune and Triton June 19, 2006

Posted by jtintle in APoD, NASA, Neptune, Planets, Space Fotos, Triton, Voyager, Website.
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See Explanation.  Clicking on the picture will download  the highest resolution version available.
Credit:

Voyager 2, NASA

Explanation:

Gliding silently through the outer Solar System, the Voyager 2 spacecraft camera captured Neptune and Triton together in crescent phase in 1989. The above picture of the gas giant planet and its cloudy moon was taken from behind just after closest approach. It could not have been taken from Earth because Neptune never shows a crescent phase to sunward Earth. The unusual vantage point also robs Neptune of its familiar blue hue, as sunlight seen from here is scattered forward, and so is reddened like the setting Sun. Neptune is smaller but more massive than Uranus, has several dark rings, and emits more light than it receives from the Sun.

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JPL Podcast: Voyager: Living on the Edge – of the Solar System June 1, 2006

Posted by jtintle in Deep Space, JPL, Podcasts, Space Agencies, Space Fotos, Voyager.
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This is a podcast from JPL covering Voyager 1&2 with the Voyager Project Scientist Dr. Ed Stone of the California Institute of Technology.

Link to the Audio File:

http://www.jpl.nasa.gov/multimedia/podcast/voyager-20060523/voyager20060523.mp3 

Transcript from the audio file:

http://www.jpl.nasa.gov/multimedia/podcast/voyager-20060523/ 

Voyager Data May Reveal Trajectory Of Solar System; Possible Presence Of Companion Star May 31, 2006

Posted by jtintle in Deep Space, JPL, NASA, Space Fotos, Voyager.
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Nearly 30 years after launch, the two Voyager spacecraft are still operational and returning useful data. In their early years they produced some of the first close up images of the large outer planets. Now as the two vehicles, flying in slightly different directions, near the edge of the solar system, they are providing clues on the shape of heliosphere, and quite possibly, the direction of the solar system through local space.

Nearly 30 years after launch, the two Voyager spacecraft are still operational and returning useful data. In their early years they produced some of the first close up images of the large outer planets. Now as the two vehicles, flying in slightly different directions, near the edge of the solar system, they are providing clues on the shape of heliosphere, and quite possibly, the direction of the solar system through local space.

The heliosphere, generated by the Sun, is sort of the cocoon in which the solar system rides. It has been suspected for several years that it is not spherical but more egg shaped. Voyager 1 recently reached one edge and it is estimated it will pass into interstellar space at about 12.4 billion miles from the Sun. It was recently announced that Voyager 2 has reached its more southerly edge, sooner than expected. It is now believed it will reach interstellar space at about 10.5 billion miles. This reveals that the heliosphere is not a sphere after all, but is more of a comet shape.

According to Cal Tech's Ed Stone, the former director of NASA's Jet Propulsion Laboratory and a Voyager chief scientist, the shape of the bubble is determined by what is pressing on the solar system from the outside, meaning the shape and force of interstellar gases. That is one explanation. Another put forth by Walter Cruttenden of the Binary Research Institute is that local gases are fairly uniform and the shape derives from the trajectory of the solar system through local space — possibly in its orbit around a companion star. While this latter explanation is far more speculative, it is not unlikely that local interstellar gases are relatively homogeneous and therefore the shape of the heliosphere may be at least partially due to motion of the solar system.

Voyager 1 and 2 are expected to remain active for several more decades. In that time we should gain a better understanding of the motion of the solar system and its surrounding neighborhood.

Source: 

ScienceDaily

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