Diffraction Grating bends white light coming from an object separates the light into the wavelengths (colors) of the visible light spectrum
Electromagnetic Spectrum and Astronomic Distances 10/4/16 Electromagnetic Spectrum and Astronomic Distances Objective: I will diagram the electromagnetic spectrum. I will compare the different measurement units used to measure distances in space. PAGE 21
Light Light is electromagnetic energy travels in waves photon- basic particle of light
Electromagnetic Spectrum range of all the wavelengths of light given off by objects
Electromagnetic Spectrum Radio Microwave Infrared Visible (ROY G. BIV) Ultraviolet X-ray Gamma
Radio longest wavelength, lowest energy
Microwave Used by astronomers to map the early universe
Infrared used to detect heat coming from objects
(ROY G. BIV) Visible Light light we can detect with our eyes Shorter Longer Wavelength Shorter Wavelength (ROY G. BIV)
Ultraviolet given off by the Sun, causes sunburn
X-Ray helps in the field of medicine
Gamma Rays shortest wavelength, highest energy
Electromagnetic Spectrum and Astronomic Distances 10/4/16 Electromagnetic Spectrum and Astronomic Distances Objective: I will diagram the electromagnetic spectrum. I will compare the different measurement units used to measure distances in space. PAGE 21
Distances in Space In astronomy, scientists rarely use kilometers too small! only use km for diameters of planets or how far away a moon is from the planet
Astronomical Unit the distance from the earth to the sun 1 AU = 93 million miles used to measure distances between planets
Light Year distance light travels in one year measure of distance, NOT time Speed of light is 3 x 108 m/s
Light Year used to measure distances between stars and galaxies
Light Year If light travels 300,000 km/s, how far does light travel in one year? This distance you calculate is the distance of one light-year. Show all of your work and answers on page 20.