telescope
Sign in to savethumb|The 100-inch (2.54 m) Hooker reflecting telescope at [[Mount Wilson Observatory near Los Angeles, used by Edwin Hubble to measure galaxy redshifts and discover the general expansion of the universe.]]
AI overview
A telescope is an instrument that uses lenses or mirrors to magnify distant objects, making them appear closer and easier to observe. Telescopes matter because they have enabled major scientific discoveries, such as when Edwin Hubble used the Hooker telescope to measure galaxy redshifts and reveal that the universe is expanding.
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Article
15 sectionsContents
- Etymology
- History
- In space
- By electromagnetic spectrum
- Radio and submillimeter
- Infrared
- Visible light
- Ultraviolet
- X-ray
- Gamma ray
- Lists of telescopes
- See also
- References
- Further reading
- External links
thumb|The 100-inch (2.54 m) Hooker reflecting telescope at [[Mount Wilson Observatory near Los Angeles, used by Edwin Hubble to measure galaxy redshifts and discover the general expansion of the universe.]]
A telescope is a device used to observe distant objects by their emission, absorption, or reflection of electromagnetic radiation. Originally, it was an optical instrument using lenses, curved mirrors, or a combination of both to observe distant objects – an optical telescope. Nowadays, the word "telescope" is defined as a wide range of instruments capable of detecting different regions of the electromagnetic spectrum, and in some cases other types of detectors.