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The Sun Across the Electromagnetic Spectrum

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X-Ray Ultraviolet Visible Infrared Radio Different wavelengths of the electromagnetic spectrum such as light and radio waves are used to gain information about ... – PowerPoint PPT presentation

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Title: The Sun Across the Electromagnetic Spectrum


1
The Sun Across the Electromagnetic Spectrum
The Electromagnetic Spectrum and the Universe
  • X-Ray

Ultraviolet
Visible
Infrared
Radio
2
Big Idea ..
The Electromagnetic Spectrum and the Universe
  • Different wavelengths of the electromagnetic
    spectrum such as light and radio waves are used
    to gain information about distances and
    properties of components in the universe

3
Radio Waves and the Universe
  • Many astronomical objects emit radio waves
  • Astronomers can make pictures from the radio
    waves being emitted
  • Radio telescopes use a large metal dish to help
    detect radio waves
  • By studying the radio waves, astronomers can
    learn about the composition, structure, and
    motion of objects
  • Radio astronomy has the advantage that sunlight,
    clouds, and rain do not affect observations

4
What do Radio Waves show us?
  • The above image shows the Carbon Monoxide (CO)
    gases in our Milky Way galaxy

Radio Waves
5
Microwaves and the Universe
  • Because microwaves can penetrate haze, light rain
    and snow, clouds and smoke, these waves are good
    for viewing the Earth from space
  • Microwaves

6
Infrared Rays and the Universe
  • Satellites, like the Infrared Astronomy Satellite
    (IRAS) look up into space and measure the
    infrared light coming from things like large
    clouds of dust and gas, stars, and galaxies
  • Infrared Universe

Exploring the Infrared Universe
7
Sunflower Galaxy Glows with Infrared Light
8
Ultraviolet and the Universe
  • We can study stars and galaxies by studying the
    UV light they give off
  • Many scientists are interested in studying the
    invisible universe of ultraviolet light, since
    the hottest and the most active objects in the
    cosmos give off large amounts of ultraviolet
    energy

Andromeda Galaxy in Ultraviolet
9
X-Rays and Gamma Rays and the Universe
  • Many things in space emit X-rays, among them are
    black holes, neutron stars, binary star systems,
    supernova remnants, stars, the Sun, and even some
    comets!
  • This radiation has such high energy that
    specially made, angled mirrors must be used to
    help collect this type of light

10
X-Rays and Gamma Rays and the Universe
  • X-ray and gamma-ray astronomy has led to the
    discovery of black holes in space, and has added
    much to our understanding of supernovae, white
    dwarfs and pulsars
  • High-energy observations also allow us to study
    the hottest regions of the Sun's atmosphere
  • The Beautiful Universe
  • Exploring the Universe through Gamma Rays

11
Gamma Rays and the Universe
  • Fermi Gamma Ray Telescope

12
Spectral Analysis
  • We cant always get a sample of a piece of the
    Universe
  • - So we depend on light !

13
Spectrographs
  • Astronomers use spectrographs to gather
    information about stars, including their chemical
    compositions and temperatures

14
Chemical Composition
  • Chemical elements in a stars atmosphere absorb
    light from the star
  • Each element absorbs light at different
    wavelengths, and each absorbed wavelength appears
    as a dark line on a spectrum
  • By comparing a stars spectrum with the known
    spectrums of different elements, we can determine
    which elements are found in stars

Hydrogen
15
Temperatures
  • The amount of energy each of these elements
    absorbs depends on the temperature of the star
  • Stars at different temperatures produce different
    line spectrums
  • Astronomers can use line spectrums to find the
    temperature of stars
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