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Relative to the comet, the direction of the ion tail tells us
Q8: Like dark matter, dark energy will also
Q18: Most astronomers now regard Pluto as the
Q24: Adding a secondary concave lens of carefully
Q27: Outside our Earth, the most likely places
Q61: The latest observations of distant Type I
Q88: The direction of the rotation of Venus
Q90: According to our definition, we have been
Q103: The Moon's composition is similar to Earth's
Q107: Explain what types of information can be
Q125: The critically bound universe, with omega =