PLAY. <span>Control. The part of an experiment that is not being tested and is used for comparison.
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When the continents are at the Earths poles, they receive less sunlight.
Answer:
Space telescopes can carry instruments to observe objects emitting various types of electromagnetic radiation such as visible, infrared or ultraviolet light; gamma rays; or x-rays. X-ray telescopes, such as the Chandra X-ray Observatory, use X-ray optics to observe remote objects in the X-ray spectrum.
Explanation:
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Through experiments and studies
