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ERAU Astronomical Observatory

Meade 12.375 inch Schmidt Cassegrain Reflecting Telescope

Ground Based Telescopes

Optical

Infrared

Radio

Refracting Telescope

Refractors Tend to be long….

Reflecting Telescope Designs

Reflecting Telescopes are Compact….

A Prism Spectrograph

A Spectrum

A Modern Spectrograph

An Electronic Imaging Camera called a CCD

Angular Resolution

Angular Resolution depends on two things…

1. The wavelength of light : (in meters)2. The size of the telescope mirror (or dish) : D (in meters)

= 2.5 x 105 /D

is the angular resolution in arcseconds

A Radio telescope “dish”

The Very Large Array (VLA) in New Mexico

Atmospheric Blurring

No atmospheric blurring in space….

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Spitzer Space Telescope

Chandra X-Ray Observatory

Compton Gamma-Ray Observatory

The sky at five different wavelengths

a- Visibleb- Radioc - Infraredd - X-raye - Gamma ray