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How we See the Universe

How we See the Universe. Mission 2. Putting it into perspective. When we organize light waves in this type of order, we call it the “Electromagnetic Spectrum” or EMS. Do the wave. Wavelength = distance between crests Amplitude = half the height of trough to crest

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How we See the Universe

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  1. How we See the Universe Mission 2

  2. Putting it into perspective When we organize light waves in this type of order, we call it the “Electromagnetic Spectrum” or EMS

  3. Do the wave Wavelength = distance between crests Amplitude = half the height of trough to crest Frequency = number of crests that pass a point in space every second … so wavelength = speed / frequency

  4. What does the EMS tell us?(Electromagnetic Spectrum) • Transports energy • Electric and magnetic fields oscillate: that’s the “wave” • Moves at speed of light, 3 x 108 m/s • Wavelength, frequency, energy all related • Type of radiation (usually) depends on energy/temperature of object

  5. I like a place with a little atmosphere… Only visible, radio and some IR and UV gets through the air! To see gamma rays, X-rays, most UV and some IR you must go to space http://imagers.gsfc.nasa.gov/ems/atmosphere.gif

  6. Spitzer Infrared Video

  7. Different Views from the Inside

  8. Flashlight Laptop Monitor Projector Sources • What is a light source? • Name some visible sources of light in the room • Is the wall at the front of the room a light source? But it seems to be emitting light? Oh, I see the wall is reflecting the light, not emitting it. Definition: Sources of light are objects that emit light energy

  9. Cameras Solar Calculators Those two openings on either side of our noses! Detectors What is a detector? Can you tell me where there are light detectors in this room? Are there any other light detectors that you know of?

  10. Transmitters and Shields • What are some materials we know of that do allow light to either completely or partially pass through it? • Is it safe to say these things “Transmit the Light”? • What are some things that don’t allow light through? Is it safe to say these things “Shield the Light”?

  11. Invisible Sources of Light • There are 6 different stations throughout the room. • They are equipped with a source of invisible light and a detector for detecting that light. • In a moment we will break up into groups. • Each station will have a set of materials. • These materials are potential shields.

  12. Procedure • Each group will go from station to station. You have about 5 minutes per station. • As scientists we are obligated to make a prediction about how we think each material will behave. DO THIS FIRST! • Then test each material at each station to see if it is a Transmitter (T) or a Shield (S) for that particular type of light. • Try to determine the common properties of the materials that block the different types of light

  13. Stations: • AM Radio • Infrared lamp • Flashlight • FM Radio • Remote control • “Black” light Let’s Get Busy!

  14. What did we learn? • What property of the materials we tested caused radio waves to be blocked? • Are all the plastics we tested translucent/transparent to infrared light? • If someone had no sunscreen while at the beach what could they cover their face with to keep from getting sun burned by UV light?

  15. M45 – The Pleiades Cluster X-ray: T. Preibisch Ultraviolet: MSX Visible: AAO Infrared: IRAS Radio: NVSS

  16. X-ray: Chandra Multi-wavelength Crab Nebula Ultraviolet: UIT Visible: Palomar Infrared: 2MASS Radio: VLA

  17. M51 – The Whirlpool Galaxy X-ray: Chandra Ultraviolet: GALEX Visible: T. & D. Hallas Infrared: ISO Radio: VLA

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