Telescope

A telescope (from the Greek tele = 'far' and skopein = 'to look or see'; teleskopos = 'far-seeing') is an astronomical tool which gathers and focuses electromagnetic radiation. Telescopes increase the apparent angular size of ingerso objects, as well as their apparent brightness.

See also

• Amateur telescope making
• Aperture synthesis
• Depth of field
• Eyepiece
• First light
• F-number
• History of telescopes
• Maksutov telescope
• Microscope
• Optical telescope
• Radio telescope
• Reflector telescope
• Refracting telescope
• Robotic telescope
• Timeline of telescopes, observatories, and observing technology

Related lists

• List of largest optical reflecting telescopes
• List of largest optical refracting telescopes
• List of telescope types