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What types of telescopes help astronomers observe the distant universe?
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To observe the distant universe, astronomers utilize a variety of specialized telescopes designed to capture electromagnetic radiation across the spectrum. Because Earth’s atmosphere absorbs or distorts certain wavelengths, many of these instruments are deployed as satellite observatories in space to provide clear, unobstructed views of the cosmos.123
Key types of telescopes include:
- Optical Telescopes: These observe in or near the visible light spectrum. While ground-based instruments like the Keck telescopes are highly effective, space-based observatories like the Hubble Space Telescope avoid atmospheric turbulence to capture high-resolution images of distant galaxies.23
- Infrared Telescopes: Instruments such as the James Webb Space Telescope and the Spitzer Space Telescope detect infrared light, which is essential for viewing the earliest stars and galaxies that formed in the universe.143
- Radio Telescopes: These capture radio waves using large antennas or arrays, such as the Very Large Array or the Five-hundred-metre Aperture Spherical radio Telescope (FAST), to study cosmic sources.12
- High-Energy Telescopes: Specialized observatories like the Chandra X-Ray Observatory and various gamma-ray detectors operate in space to study high-energy phenomena, including black holes and supernova remnants, which cannot be observed from the ground due to atmospheric absorption.256