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A few applications of large optical telescopes are stargazing and astronomical research. A few of the most famous optical telescopes are the Hubble Space Telescope and the telescope at the United States Naval Observatory in Washington, D.C. which discovered Mars’ moons Phobos and Deimos ( , n.d.). “The Hubble Space Telescope is a Cassegrain reflector telescope. That just means that light enters the device through the opening and bounces off the primary mirror to a secondary mirror. The secondary mirror in turn reflects the light through a hole in the center of the primary mirror to a behind the primary mirror” ( , 2000). Below is a photo of the Hubble Space Telescope. Telescopes that utilize mirrors are known as reflector telescopes. These mirrors are placed specifically inside the telescope to gather and focus light to the eye piece. Due to this process, reflector telescopes perform well in low-light situations. Other advantages of mirrors are that they are lighter, and easier to make completely smooth (NASA, 2019). References: (n.d.). Sciencing. . (2000, December 1). HowStuffWorks. NASA. (2019). . Nasa.gov.