Target for a Lunar Telescope - Revision history

Farred: somewhat restoring dead link

2013-05-11T22:19:15Z

somewhat restoring dead link

Farred: dead link

2013-05-11T21:42:14Z

dead link

Farred: wikifying reference

2013-05-11T21:38:08Z

wikifying reference

Farred: /* Targets for a Lunar Telescope */ tweak

2013-05-11T21:09:14Z

Targets for a Lunar Telescope: tweak

Farred: removing poor red links, linking Freeman Dyson, minor correction

2011-11-30T12:03:20Z

removing poor red links, linking Freeman Dyson, minor correction

Farred: Undo revision 16873 by 168.8.212.113 (talk) removing nonsense

2011-11-30T07:57:47Z

Undo revision 16873 by 168.8.212.113 (talk) removing nonsense

168.8.212.113 at 20:20, 29 November 2011

2011-11-29T20:20:16Z

Farred: addition

2011-08-09T21:30:43Z

addition

Farred: addition

2010-02-21T17:05:03Z

addition

Farred: making reference available to users not logged in

2010-02-21T16:40:37Z

making reference available to users not logged in

@@ Line 3: / Line 3: @@
 == Targets for a Lunar Telescope ==
 *A potential target would be a Dyson sphere.  This is the hypothetical effect of an advanced civilization capturing all of the radiant energy of its star and reradiating it in the infrared after using the energy.  Some people have misrepresented this concept as a rotating solid sphere held up by a combination of centrifugal and rigid body forces, but [[Freeman Dyson]] himself referred to a swarm of objects which would orbit a star each in an independent orbit and each capturing the stars energy when it is not shaded by another object in the swarm.
-*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<ref>[http://www.paulbirch.net/CustomPlanets.html Paul Birch's supramundane planets] dead link</ref>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
+*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<ref>Search [http://archive.org/web/web.php WaybackMachine] for the 14th of June 2011 copy of <nowiki>http://www.paulbirch.net/SupramundanePlanets.zip</nowiki></ref>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
 *Whenever one finds a silly idea attributed to a famous person such as Freeman Dyson, one should suspect that the idea may be a misrepresentation, and check exactly what the famous person said.  And when people suggest that a rigid hollow sphere surrounding a star is impossible, only the lack of imagination is at fault.
 *Some people might suggest, as was suggested for Larry Niven’s Ringworld, that a solid shell (or ring) around a star is dynamicly unstable.  Larry Niven inserted station keeping thrusters into the Ringworld in his story.  As an author he did not need to face the problem of refueling those thrusters.  He could have specified a mass shifting scheme instead.  Moving mass from the side of ring world too close to the star to the other side would move the ring closer to its unstable equilibrium position as a reaction, and cause gravitational force also to act in a dirction restoring the unstable equilibrium position.  The same sort of mass shifting scheme could provide station keeping for a nonrotating rigid sphere more easily.

@@ Line 3: / Line 3: @@
 == Targets for a Lunar Telescope ==
 *A potential target would be a Dyson sphere.  This is the hypothetical effect of an advanced civilization capturing all of the radiant energy of its star and reradiating it in the infrared after using the energy.  Some people have misrepresented this concept as a rotating solid sphere held up by a combination of centrifugal and rigid body forces, but [[Freeman Dyson]] himself referred to a swarm of objects which would orbit a star each in an independent orbit and each capturing the stars energy when it is not shaded by another object in the swarm.
-*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<ref> Paul Birch's supramundane planets http://www.paulbirch.net/CustomPlanets.html </ref>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
+*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<ref>[http://www.paulbirch.net/CustomPlanets.html Paul Birch's supramundane planets] dead link</ref>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
 *Whenever one finds a silly idea attributed to a famous person such as Freeman Dyson, one should suspect that the idea may be a misrepresentation, and check exactly what the famous person said.  And when people suggest that a rigid hollow sphere surrounding a star is impossible, only the lack of imagination is at fault.
 *Some people might suggest, as was suggested for Larry Niven’s Ringworld, that a solid shell (or ring) around a star is dynamicly unstable.  Larry Niven inserted station keeping thrusters into the Ringworld in his story.  As an author he did not need to face the problem of refueling those thrusters.  He could have specified a mass shifting scheme instead.  Moving mass from the side of ring world too close to the star to the other side would move the ring closer to its unstable equilibrium position as a reaction, and cause gravitational force also to act in a dirction restoring the unstable equilibrium position.  The same sort of mass shifting scheme could provide station keeping for a nonrotating rigid sphere more easily.

@@ Line 1: / Line 1: @@
 If at some future time an infrared [[telescope]] is placed on [[Luna]] or manufactured there, it might be located at 85 degrees either north or south latitude.  It should be at the point that is furthest from Earth at that latitude.  At such a spot the sun is never more than 6.5 degrees above the horizon as it shines from the direction of the equator, and Earth's disk only partially peeks over the pole once a month.  So, it would require only a low wall to prevent these sources from interfering with the telescope.
-−
 == Targets for a Lunar Telescope ==
 *A potential target would be a Dyson sphere.  This is the hypothetical effect of an advanced civilization capturing all of the radiant energy of its star and reradiating it in the infrared after using the energy.  Some people have misrepresented this concept as a rotating solid sphere held up by a combination of centrifugal and rigid body forces, but [[Freeman Dyson]] himself referred to a swarm of objects which would orbit a star each in an independent orbit and each capturing the stars energy when it is not shaded by another object in the swarm.
-*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<sup>[1]</sup>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
+*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<ref> Paul Birch's supramundane planets http://www.paulbirch.net/CustomPlanets.html </ref>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
 *Whenever one finds a silly idea attributed to a famous person such as Freeman Dyson, one should suspect that the idea may be a misrepresentation, and check exactly what the famous person said.  And when people suggest that a rigid hollow sphere surrounding a star is impossible, only the lack of imagination is at fault.
 *Some people might suggest, as was suggested for Larry Niven’s Ringworld, that a solid shell (or ring) around a star is dynamicly unstable.  Larry Niven inserted station keeping thrusters into the Ringworld in his story.  As an author he did not need to face the problem of refueling those thrusters.  He could have specified a mass shifting scheme instead.  Moving mass from the side of ring world too close to the star to the other side would move the ring closer to its unstable equilibrium position as a reaction, and cause gravitational force also to act in a dirction restoring the unstable equilibrium position.  The same sort of mass shifting scheme could provide station keeping for a nonrotating rigid sphere more easily.
 *Whatever means an advanced civilizations would use to gather all the energy of its star, if we do not find them doing that, the lack needs to be explained.  One explanation, of course, is that humanity is the only industrially competent species in the galaxy.
-−
 == Advantage for Lunar Telescopes ==
 For telescopes manufactured on Earth, there is generally no advantage to ship them to Luna to operate them.  They can be used in independent orbit about the sun or about the Earth.  The advantage in using telescopes on Luna accrues when the telescopes are manufactured on Luna and never need to be lifted into orbit from Earth.
-−
 === Reference ===
-:1. Paul Birch's supramundane planets http://www.paulbirch.net/CustomPlanets.html
+<references/>
-−
   [[category:Lunar Science]]

@@ Line 5: / Line 5: @@
 *An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<sup>[1]</sup>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
 *Whenever one finds a silly idea attributed to a famous person such as Freeman Dyson, one should suspect that the idea may be a misrepresentation, and check exactly what the famous person said.  And when people suggest that a rigid hollow sphere surrounding a star is impossible, only the lack of imagination is at fault.
-*Some people might suggest, as was suggested for Larry Niven’s Ringworld, that a solid shell (or ring) around a star is dynamicly unstable.  Larry Niven inserted station keeping thrusters into the Ringworld in his story.  As an author he did not need to face the problem of refueling those thrusters.  He could have specified a mass shifting scheme instead.  Moving mass from the side of ring world too close to the star to the other side would move the ring closer to its unstable equilibrium position as a reaction, and direct gravitational force to moving the ring in the same direction.  The same sort of mass shifting scheme could provide station keeping for a nonrotating rigid sphere more easily.
+*Some people might suggest, as was suggested for Larry Niven’s Ringworld, that a solid shell (or ring) around a star is dynamicly unstable.  Larry Niven inserted station keeping thrusters into the Ringworld in his story.  As an author he did not need to face the problem of refueling those thrusters.  He could have specified a mass shifting scheme instead.  Moving mass from the side of ring world too close to the star to the other side would move the ring closer to its unstable equilibrium position as a reaction, and cause gravitational force also to act in a dirction restoring the unstable equilibrium position.  The same sort of mass shifting scheme could provide station keeping for a nonrotating rigid sphere more easily.
 *Whatever means an advanced civilizations would use to gather all the energy of its star, if we do not find them doing that, the lack needs to be explained.  One explanation, of course, is that humanity is the only industrially competent species in the galaxy.

@@ Line 1: / Line 1: @@
-If at some future time an infrared [[telescope]] is placed on [[Luna]] or manufactured there, it might be located at 85 degrees either north or south [[latitude]].  It should be at the point that is furthest from Earth at that latitude.  At such a spot the sun is never more than 6.5 degrees above the horizon as it shines from the direction of the [[equator]], and Earth's disk only partially peeks over the pole once a month.  So, it would require only a low wall to prevent these sources from interfering with the telescope.
+If at some future time an infrared [[telescope]] is placed on [[Luna]] or manufactured there, it might be located at 85 degrees either north or south latitude.  It should be at the point that is furthest from Earth at that latitude.  At such a spot the sun is never more than 6.5 degrees above the horizon as it shines from the direction of the equator, and Earth's disk only partially peeks over the pole once a month.  So, it would require only a low wall to prevent these sources from interfering with the telescope.
 == Targets for a Lunar Telescope ==
-*A potential target would be a Dyson sphere.  This is the hypothetical effect of an advanced civilization capturing all of the radiant energy of its star and reradiating it in the infrared after using the energy.  Some people have misrepresented this concept as a rotating solid sphere held up by a combination of centrifugal and rigid body forces, but Freeman Dyson himself referred to a swarm of objects which would orbit a star each in an independent orbit and each capturing the stars energy when it is not shaded by another object in the swarm.
+*A potential target would be a Dyson sphere.  This is the hypothetical effect of an advanced civilization capturing all of the radiant energy of its star and reradiating it in the infrared after using the energy.  Some people have misrepresented this concept as a rotating solid sphere held up by a combination of centrifugal and rigid body forces, but [[Freeman Dyson]] himself referred to a swarm of objects which would orbit a star each in an independent orbit and each capturing the stars energy when it is not shaded by another object in the swarm.
-*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at superorbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<sup>[1]</sup>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
+*An alternative for the rigid body shell is to have a nonrotating shell held up by rails that move through tubular vacuum chambers in the rigid shell to circle the star at super-orbital speed.  These tubular vacuum chambers would be placed in numerous orbital planes.<sup>[1]</sup>  The shell would then be held up by magnetic attraction to the rails.  If humanity were to become technically competent to build such a thing and for some reason driven to do it, building a shell at a distance of one astronomical unit from the sun, the shell would be held up against the six-ten-thousandths of a g that the sun exerts at that distance.  Large areas of solar cells might be only a couple of millimeters thick while living spaces would include ten meter thick shielding and internal centrifuges to produce artificial gravity.
 *Whenever one finds a silly idea attributed to a famous person such as Freeman Dyson, one should suspect that the idea may be a misrepresentation, and check exactly what the famous person said.  And when people suggest that a rigid hollow sphere surrounding a star is impossible, only the lack of imagination is at fault.
 *Some people might suggest, as was suggested for Larry Niven’s Ringworld, that a solid shell (or ring) around a star is dynamicly unstable.  Larry Niven inserted station keeping thrusters into the Ringworld in his story.  As an author he did not need to face the problem of refueling those thrusters.  He could have specified a mass shifting scheme instead.  Moving mass from the side of ring world too close to the star to the other side would move the ring closer to its unstable equilibrium position as a reaction, and direct gravitational force to moving the ring in the same direction.  The same sort of mass shifting scheme could provide station keeping for a nonrotating rigid sphere more easily.

← Older revision		Revision as of 21:30, 9 August 2011
Line 1:		Line 1:
−	If at some future time an infrared [[telescope]] is placed on [[Luna]], it might be located at 85 degrees either north or south [[latitude]]. It should be at the point that is furthest from Earth at that latitude. At such a spot the sun is never more than 6.5 degrees above the horizon as it shines from the direction of the [[equator]], and Earth's disk only partially peeks over the pole once a month. So, it would require only a low wall to prevent these sources from interfering with the telescope.	+	If at some future time an infrared [[telescope]] is placed on [[Luna]] or manufactured there, it might be located at 85 degrees either north or south [[latitude]]. It should be at the point that is furthest from Earth at that latitude. At such a spot the sun is never more than 6.5 degrees above the horizon as it shines from the direction of the [[equator]], and Earth's disk only partially peeks over the pole once a month. So, it would require only a low wall to prevent these sources from interfering with the telescope.

	== Targets for a Lunar Telescope ==		== Targets for a Lunar Telescope ==