telescopes were first invented around the year 1600. galileo galilei was an early astronomer who...
TRANSCRIPT
Telescopes
• Telescopes were first invented around the year 1600.
• Galileo Galilei was an early astronomer who first used telescopes to view objects in our solar system.
• He made many important discoveries including: the moon was covered in mountains and Jupiter had 4 large moons.
Galileo, Galileo
• Telescopes are instruments that collect and focus light and other forms of electromagnetic radiation.
• Electromagnetic radiation is the invisible energy waves on the electromagnetic spectrum.
• A telescope that uses lenses and mirrors to collect and focus visible light is called an optical telescope.
• The two main types of optical telescopes are refracting telescopes and reflecting telescopes.
Modern Telescopes
Electromagnetic Spectrum
REFRACTING REFLECTING
• A reflecting telescope, or reflector, uses mirrors instead of glass lenses.
• The mirrors bounce light rays to focus them.
• These were developed by Sir Isaac Newton around 1670.
• The majority of telescopes used today are reflectors
• A refracting telescope, or refractor, is a telescope that uses glass lenses to collect and focus light into an image
• These glass lenses bends light rays to focus them.
• These were the earliest type of telescopes, used by Galileo to study objects in our solar system
Refracting vs. Reflecting telescopes
• Simply put, radio telescopes are different from reflecting or refracting telescopes in that • they detect radio waves instead of
light waves
Radio Telescopes
• Since Earth’s atmosphere blocks many wavelengths of invisible light, astronomers have placed telescopes in space.
• These telescopes include the Hubble Space Telescope, the Chandra X-Ray Observatory, and the Spitzer Space Telescope.
• These different telescopes each observe a different wavelength on the electromagnetic spectrum (the spectrum of all visible and invisible light).
Telescopes in SPACE
Which is Which?Use your textbook to find the differences between the following three:
Hubble Space Telescope
Chandra X-Ray Observatory
Spitzer Space Telescope