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X-rays,because they have more energy,travel through space faster than visible light.
Q10: Your friend tells you that last night,
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Q53: The Cassini mission to Saturn consists of<br>A)
Q76: Why do we think Mercury has so
Q77: We can't detect stellar parallax with naked-eye
Q84: For most of history, the lack of
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Q151: In the 1800s, many people assumed that