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Telescopes observe distant objects by detecting electromagnetic radiation they emit, absorb, or reflect.
A telescope is an instrument used to observe distant objects by detecting electromagnetic radiation that the objects emit, absorb, or reflect. Historically, telescopes were optical devices that used lenses and/or curved mirrors to gather light and form an image. Today, the term “telescope” covers a wide range of instruments designed to detect different regions of the electromagnetic spectrum, and sometimes other kinds of detectors. The purpose of telescopes is to make faraway targets observable and measurable by collecting radiation and improving how that radiation is focused or detected. Because Earth’s atmosphere blocks most wavelengths, telescopes can be placed on the ground or in space depending on the wavelength being studied. Different telescope designs are used for different frequency bands (e.g., optical telescopes for visible light, radio telescopes for longer wavelengths, and specialized X-ray and gamma-ray instruments), allowing astronomers to study the universe across the electromagnetic spectrum.
Telescopes observe distant objects by detecting electromagnetic radiation they emit, absorb, or reflect.
Modern telescopes span many wavelengths (from radio to gamma rays) and use different detection and optics methods depending on the spectrum region.
Location matters: many wavelengths are blocked by Earth’s atmosphere, so some observations require space-based or specialized platforms.
A device used to observe distant objects by detecting electromagnetic radiation that they emit, absorb, or reflect.
A telescope that uses lenses and/or curved mirrors to gather and focus light for observation.
A telescope placed in orbit to observe wavelengths that are blocked or distorted by Earth’s atmosphere.
The full range of electromagnetic radiation frequencies and wavelengths, from radio waves to gamma rays.
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