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Space debris (also known as "orbital debris", "space junk", or "space waste") is the collection of defunct objects in orbit around Earth and includes everything from spent rocket stages, old satellite…
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Questions regarding the National Aeronautics and Space Administration, the American civilian space agency.
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Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.
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track and display the current time.
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like stars but never achieve nuclear fusion because they are too low-mass.
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about the lack of evidence for alien life, despite the growing evidence that suitable planets are reasonably plentiful.
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Questions about Europa, a moon of Jupiter with a planet-wide ocean under a thick ice crust.
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Questions about large, dense, massive collections of stars orbiting galaxies, thought to have formed in the early universe.
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Questions about gas-giant planets in very close orbit to their parent star (closer than Mercury).
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Second lightest element in the periodic table
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Questions about Trojan Asteroids, asteroids that co-orbit major planets.
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Questions regarding a theoretical 'tunnel' through spacetime which could potentially allow time travel.
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the group of galaxies that includes the Milky Way among others.
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