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Examples
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These notional missions include observatories designed to operate in Low-Earth Orbit (LEO), at Geosynchronous Earth Orbit (GEO), and at Earth-Sun Lagrangian points L1 and L2.
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JWST was designed specifically to operate at Earth-Sun L2, which uniquely allows very efficient passive cooling, and thereby avoids the need for huge amounts of power to do active cooling with failure-prone mechanical cryocoolers.
Astronauts Once Again Demonstrate Why Humans Must be a Part of Space Exploration - NASA Watch 2009
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Earth-Sun L2 basing provides for a dramatically simpler mission, which equates to less need for servicing.
Astronauts Once Again Demonstrate Why Humans Must be a Part of Space Exploration - NASA Watch 2009
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These notional missions include observatories designed to operate in Low-Earth Orbit (LEO), at Geosynchronous Earth Orbit (GEO), and at Earth-Sun Lagrangian points L1 and L2.
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Destinations besides Moon and Mars would include the Earth-Moon and Earth-Sun Lagrange points, near-Earth objects (NEOs) and the moons of Mars.
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In addition, he is the first I know of to discern that the distance to the stars is several orders of magnitude greater than the Earth-Sun distance.
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The fact that it's a little hard to get people to Earth-Sun L2 has nothing to do with it.
Astronauts Once Again Demonstrate Why Humans Must be a Part of Space Exploration - NASA Watch 2009
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As to servicing a telescope that works at Earth-Sun L2, that's not an issue.
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Their size is equivalent to the Earth-Sun distance.
Unprecedented Images Show Betelgeuse Has Sunspots | Universe Today 2010
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The largest of the two structures has a dimension equivalent to the quarter of the star diameter or one and a half the Earth-Sun distance.
Unprecedented Images Show Betelgeuse Has Sunspots | Universe Today 2010
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