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Electromagnetic Spectrum - Introduction - Imagine the Universe!
The electromagnetic (EM) spectrum is the range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.

Spectra and What They Can Tell Us - Imagine the Universe!
But the electromagnetic spectrum encompasses more than just optical light. It covers all energies of light, extending from low-energy radio waves, to microwaves, to infrared, to optical light, to ultraviolet, to very high-energy X-rays and gamma rays.

The Electromagnetic Spectrum - Imagine the Universe!
The electromagnetic spectrum can be expressed in terms of energy, wavelength or frequency. Each way of thinking about the EM spectrum is related to the others in a precise mathematical way. Scientists represent wavelength and frequency by the Greek letters lambda (λ) and nu (ν).

The Electromagnetic Spectrum - Imagine the Universe!
The Electromagnetic Spectrum Author: Sarah Eyermann Subject: A black and white diagram of the electromagnetic spectrum and the different wavelength bands. Created Date: 20120131195807Z

Observatories Across the Electromagnetic Spectrum - Imagine the Universe!
Astronomers use a number of telescopes sensitive to different parts of the electromagnetic spectrum to study objects in space. Even though all light is fundamentally the same thing, the way that astronomers observe light depends on the portion of the spectrum they wish to study.

The Electromagnetic Spectrum - Imagine the Universe!
The Electromagnetic Spectrum Author: Sarah Eyermann Subject: A color diagram of the electromagnetic spectrum and the different wavelength bands. Created Date: 20120131195324Z

Wavelength, Frequency, and Energy - Imagine the Universe!
Regions of the Electromagnetic Spectrum Listed below are the approximate wavelength, frequency, and energy limits of the various regions of the electromagnetic spectrum.

Background: Introduction to Spectroscopy - Imagine the Universe!
The Electromagnetic Spectrum. White light (what we call visible or optical light) can be split up into its colors easily and with a familiar result - the rainbow. All we have to do is use a slit to focus a narrow beam of the light at a prism. This set-up is actually a basic spectrometer.

Astronomer's Toolbox - Imagine the Universe!
Astronomers need to collect light from across the electromagnetic spectrum to completely understand a celestial object. Use the links below to explore how astronomers use the highest energies of light to learn about our Universe.

Imagine the Universe!
Almost none of the infrared portion of the electromagnetic spectrum can reach the surface of the Earth, although some portions can be observed by high-altitude aircraft (such as the Kuiper Observatory) or telescopes on high mountaintops (such as the peak of Mauna Kea in Hawaii).

         

 

 

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