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#11
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How long could a man-made earth satellite stay up?
Na, I watch maybe 30 mins of news a day and that's all. But Can you NAME the
object I've been talking about? It was the 2nd one lauched but the first to reach orbit from the USA, the first one turned into scrap metal the first try. I might be mistaken here, I'd have to go dig some books out, but I knon it was the first major one in orbit and from the NASA sat traker it's still up there. almost 50 years now come 2009. -- There are those who believe that life here, began out there, far across the universe, with tribes of humans, who may have been the forefathers of the Egyptians, or the Toltecs, or the Mayans. Some believe that they may yet be brothers of man, who even now fight to survive, somewhere beyond the heavens. The Lone Sidewalk Astronomer of Rosamond Telescope Buyers FAQ http://home.inreach.com/starlord Sidewalk Astronomy www.sidewalkastronomy.info The Church of Eternity http://home.inreach.com/starlord/church/Eternity.html "Chris L Peterson" wrote in message ... On Sat, 20 Jan 2007 14:00:17 -0800, "Starlord" wrote: I'm sure they know about it, but while not running, it is still in orbit and has been tracked. I think he was worrying- tongue in cheek- about them turning it into a debris cloud for practice. (Been following the news the last few days?) _________________________________________________ Chris L Peterson Cloudbait Observatory http://www.cloudbait.com |
#12
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How long could a man-made earth satellite stay up?
On Sat, 20 Jan 2007 15:37:39 -0800, "Starlord"
wrote: Na, I watch maybe 30 mins of news a day and that's all. But Can you NAME the object I've been talking about? It was the 2nd one lauched but the first to reach orbit from the USA, the first one turned into scrap metal the first try. I might be mistaken here, I'd have to go dig some books out, but I knon it was the first major one in orbit and from the NASA sat traker it's still up there. almost 50 years now come 2009. Not sure which you're thinking of. If you're talking about launches in the 1950s, I know that Explorer 7 (1959) is still in orbit. I believe all the earlier Explorers either failed to reach orbit, or have long since decayed. _________________________________________________ Chris L Peterson Cloudbait Observatory http://www.cloudbait.com |
#13
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How long could a man-made earth satellite stay up?
"Starlord" wrote in
: Na, I watch maybe 30 mins of news a day and that's all. But Can you NAME the object I've been talking about? It was the 2nd one lauched but the first to reach orbit from the USA, the first one turned into scrap metal the first try. I might be mistaken here, I'd have to go dig some books out, but I knon it was the first major one in orbit and from the NASA sat traker it's still up there. almost 50 years now come 2009. warning spoiler... http://home.swipnet.se/~w-52936/index20.htm |
#14
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How long could a man-made earth satellite stay up?
The post right after yours has the right answer.
-- There are those who believe that life here, began out there, far across the universe, with tribes of humans, who may have been the forefathers of the Egyptians, or the Toltecs, or the Mayans. Some believe that they may yet be brothers of man, who even now fight to survive, somewhere beyond the heavens. The Lone Sidewalk Astronomer of Rosamond Telescope Buyers FAQ http://home.inreach.com/starlord Sidewalk Astronomy www.sidewalkastronomy.info The Church of Eternity http://home.inreach.com/starlord/church/Eternity.html "Chris L Peterson" wrote in message ... On Sat, 20 Jan 2007 15:37:39 -0800, "Starlord" wrote: Na, I watch maybe 30 mins of news a day and that's all. But Can you NAME the object I've been talking about? It was the 2nd one lauched but the first to reach orbit from the USA, the first one turned into scrap metal the first try. I might be mistaken here, I'd have to go dig some books out, but I knon it was the first major one in orbit and from the NASA sat traker it's still up there. almost 50 years now come 2009. Not sure which you're thinking of. If you're talking about launches in the 1950s, I know that Explorer 7 (1959) is still in orbit. I believe all the earlier Explorers either failed to reach orbit, or have long since decayed. _________________________________________________ Chris L Peterson Cloudbait Observatory http://www.cloudbait.com |
#15
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How long could a man-made earth satellite stay up?
Yep that's it.
-- There are those who believe that life here, began out there, far across the universe, with tribes of humans, who may have been the forefathers of the Egyptians, or the Toltecs, or the Mayans. Some believe that they may yet be brothers of man, who even now fight to survive, somewhere beyond the heavens. The Lone Sidewalk Astronomer of Rosamond Telescope Buyers FAQ http://home.inreach.com/starlord Sidewalk Astronomy www.sidewalkastronomy.info The Church of Eternity http://home.inreach.com/starlord/church/Eternity.html "VicXnews" wrote in message ... "Starlord" wrote in : Na, I watch maybe 30 mins of news a day and that's all. But Can you NAME the object I've been talking about? It was the 2nd one lauched but the first to reach orbit from the USA, the first one turned into scrap metal the first try. I might be mistaken here, I'd have to go dig some books out, but I knon it was the first major one in orbit and from the NASA sat traker it's still up there. almost 50 years now come 2009. warning spoiler... http://home.swipnet.se/~w-52936/index20.htm |
#16
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How long could a man-made earth satellite stay up?
Potentially, millions of years. The higher a satellite's orbit, the better.
Carl Sagan tackled this topic in one of his books; I think it was _Murmurs of Earth_. IIRC, on board one of the GOES satellites (geosynchronous Earth orbit, which means it's thousands of miles up) is a plaque with artwork that shows the current placement of the world's continents, as well as how we think the same continents were positioned millions of years ago... as well as how we think the future shifting of the continental plates will take the land masses millions of years into the future. Potentially, anyone finding that satellite in the far-distant future will have a rough visual idea of when that satellite was launched. There are plenty of spacecraft which have left Earth's influence entirely and will never return. Some are already past all of the major planets of the solar system and are still heading out at high speed. |
#18
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How long could a man-made earth satellite stay up?
Starlord wrote: Na, I watch maybe 30 mins of news a day and that's all. But Can you NAME the object I've been talking about? It was the 2nd one lauched but the first to reach orbit from the USA, the first one turned into scrap metal the first try. I might be mistaken here, I'd have to go dig some books out, but I knon it was the first major one in orbit and from the NASA sat traker it's still up there. almost 50 years now come 2009. FIrst attempts (in the USA) were made by the US Navy with their Vanguard rockets, but those had a miserable history of failure and explosions. The first successful USA satellite launch was the US Army's Explorer I on a modifed Redstone rocket on the evening of January 31, 1958 (I was there :-) Explorer 3, a few months later, was the one that discovered the van Allen belts whose presence was hinted-at by data from Explorer I. Haven't found anything indicating whethe Explorer I is still orbiting or not. |
#19
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How long could a man-made earth satellite stay up?
On 21 Jan 2007 02:14:54 -0800, wrote:
Haven't found anything indicating whethe Explorer I is still orbiting or not. Explorer 1 decayed on March 31, 1970, after 12 years in orbit. The Explorer program continues to this day, so many objects remain in orbit. The oldest are Explorer 7 and 8, launched in 1959 and 1960 respectively. _________________________________________________ Chris L Peterson Cloudbait Observatory http://www.cloudbait.com |
#20
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How long could a man-made earth satellite stay up?
In article ,
Matt J. McCullar wrote: Potentially, millions of years. The higher a satellite's orbit, the better. However, there's one other thing to consider: the Moon. If the satellite orbit is too close to (or in resonance with) the Moon, then the Moon will severely perturb its orbit. Carl Sagan tackled this topic in one of his books; I think it was _Murmurs of Earth_. IIRC, on board one of the GOES satellites (geosynchronous Earth orbit, which means it's thousands of miles up) is a plaque with artwork that shows the current placement of the world's continents, as well as how we think the same continents were positioned millions of years ago... as well as how we think the future shifting of the continental plates will take the land masses millions of years into the future. Potentially, anyone finding that satellite in the far-distant future will have a rough visual idea of when that satellite was launched. There are plenty of spacecraft which have left Earth's influence entirely and will never return. Some are already past all of the major planets of the solar system and are still heading out at high speed. True, however once a spacecraft has left the Earth's influence, it is no longer an artificial Earth satellite but instead an artificial minor planet. Such objects are likely to live for an extremely long time, though. -- ---------------------------------------------------------------- Paul Schlyter, Grev Turegatan 40, SE-114 38 Stockholm, SWEDEN e-mail: pausch at stockholm dot bostream dot se WWW: http://stjarnhimlen.se/ |
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