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Telescopes observe distant objects by detecting electromagnetic radiation they emit, absorb, or reflect.
A telescope is a device for observing distant objects by detecting their emission, absorption, or reflection of electromagnetic radiation. Historically, telescopes were optical instruments—using lenses, curved mirrors, or both—to gather and focus light from far away. Today, the term “telescope” includes a wide variety of instruments designed to detect different regions of the electromagnetic spectrum and, in some cases, other kinds of detectors. The purpose of telescopes is to collect electromagnetic radiation and concentrate it so that astronomers can form images or measurements with greater apparent brightness and angular size (for optical systems) or higher-resolution data (for other wavelength regimes). Telescopes can be built on the ground or in space, depending on which wavelengths they must observe; Earth’s atmosphere blocks most of the spectrum, so many observations (such as X-ray and far-infrared) require space-based telescopes. Overall, telescopes enable astronomy across radio, infrared, visible, ultraviolet, X-ray, and gamma-ray wavelengths by using different collection and focusing methods suited to each band.
Telescopes observe distant objects by detecting electromagnetic radiation they emit, absorb, or reflect.
Modern telescopes cover many wavelength bands, using different technologies and sometimes requiring space to bypass atmospheric absorption.
A device used to observe distant objects by detecting their emission, absorption, or reflection of electromagnetic radiation.
A telescope that uses lenses, curved mirrors, or both to gather and focus light for observation.
A telescope placed in orbit to observe wavelengths that are blocked or strongly limited by Earth’s atmosphere.
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