Optical and radio astronomy can be performed with ground-based observatories, because the atmosphere is relatively transparent at the wavelengths being detected. Ultra HD photography taken at La Silla Observatory. Observing a source using multiple methods is known as multi-messenger astronomy. In addition to using electromagnetic radiation, modern astrophysicists can also make observations using neutrinos, cosmic rays or gravitational waves. Multi- chord asteroid occultation observations measure the profile of the asteroid to the kilometre level.
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