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Q16: How much gravitational force acts on an
Q26: When light in air or a vacuum
Q59: If an astronomer finds an object at
Q65: A beam of light of which of
Q87: Only three elements are believed to have
Q192: A light-year is a measure of:<br>A) angle.<br>B)
Q283: The true orbital period of Earth around
Q305: Suppose we were to observe two supernovas
Q325: A horse is dragging a loaded sled
Q349: Normal reflecting telescopes,with minor adjustments,can be made