Electromagnetic (EM) waves and gravitational waves are the only available means to study the Universe on a large scale. For millennia, only the former could be used, in naked-eye astronomical observations by the ancients based on the reception of visible light, or present-day super telescopes operating in various bands of the EM spectrum, from radio waves to gamma rays.
from General Physics News - Science News, Physics News, Physics, Material Sciences, Science https://ift.tt/RN5ny1b
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