Learn about telescopes, how they work & why they're important to astronomers.
Browse our resource collection by type:
Browse Backgrounders resources Browse Career Profile resources Browse Case Studies resources Browse Hands-on Activities resources Browse Interactives resources Browse Learning Strategies resources Browse Lessons resources Browse Picture Collections resources Browse Projects resources Browse STEM in Context resources Browse Video Channels resources
Hubble Space Telescope as seen during a servicing mission in 2009 (NASA)
Learn about the history of telescopes and the function of refracting and reflecting optical telescopes.
Learn about radio astronomy, a type of astronomy that studies objects in space using radio waves and radio telescopes.
The human eye lets us see the world by sending impulses to our nervous system. In many ways, it is very similar to other optical devices, including cameras.