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Exploring Space. Radiation From Space. Electromagnetic Spectrum Energy leaves a star in the form of radiation Transmitted by electromagnetic waves Waves arranged according to wavelengths. Speed of Light. 300,000 km / sec. 186,000 mi / sec. In a vacuum (space). Energy Waves.

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## Exploring Space

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**Radiation From Space**• Electromagnetic Spectrum • Energy leaves a star in the form of radiation • Transmitted by electromagnetic waves • Waves arranged according to wavelengths**Speed of Light**300,000 km / sec. 186,000 mi / sec. In a vacuum (space)**Energy Waves**• Crest – Top (highest point) of each wave • Trough – Bottom (lowest point) of a wave • Wavelength – Distance between successive wave crests (troughs) • Frequency – # of crests (troughs) that pass a point in 1 second • Amplitude – distance between a wave’s mid point and its crest (trough)**Energy Waves (cont.)**• Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) _________ the wavelength = _________ frequency _________ the wavelength = _________ frequency**Energy Waves (cont.)**• Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = _________ frequency _________ the wavelength = _________ frequency**Energy Waves (cont.)**• Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = Higher frequency _________ the wavelength = _________ frequency**Energy Waves (cont.)**• Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = Higher frequency The longer the wavelength = _________ frequency**Energy Waves (cont.)**• Passage of 1 wave = 1 cycle • 1 cycle / second = 1 hertz (Hz) The shorter the wavelength = Higher frequency The longer the wavelength = Lower frequency**Light**• Made up of all colors of the spectrum • Travels in a straight path • Slows down as it travels through different substances**Light**• Reflect – the bouncing of light off the surface of a material • Refract – the bending of light as it passes from one substance to another**Colors**• White – all colors reflected • Black – all colors absorbed • You don’t “see” black • Sensation when very little light of any color reaches your eye • Green – green, blue, yellow reflected**What happens when you wear a black shirt on a hot summer**day? Why?**Telescope (far.. see)**Radio Telescopes Optical Telescopes**Telescope (far.. see)**Radio Telescopes collects and focuses radio waves Optical Telescopes**Telescope (far.. see)**Radio Telescopes collects and focuses radio waves Optical Telescopes collects and focuses light rays**Telescope (far.. see)**Radio Telescopes Optical Telescopes Refracting: uses a lens to bend light to a focal point Reflecting: uses a mirror to bounce light to a focal point**Focal Length**focal point**Focal Length**focal point Objective Lens**Focal Length**Eyepiece focal point Objective Lens**Light rays from the eyepiece enter your eye before it**crosses the focal plane, therefore the image is not corrected (re-inverted). Eyepiece Objective Lens**Focal Length**Eyepiece Objective Lens F (objective) Magnification = F (eyepiece)**Focal Length**Eyepiece Objective Lens 700 mm Magnification = 15 mm**Focal Length**Eyepiece Objective Lens Magnification = 46.6 x**Focal Length**Eyepiece Objective Lens 700 mm Magnification = 10 mm**Focal Length**Eyepiece Objective Lens Magnification = 70 x**Focal Length**Eyepiece Objective Lens 700 mm Magnification = 5 mm

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