TELESCOPES Telescopes n Write what is in YELLOW

Telescopes n Write what is in YELLOW n You will be accountable for text

Where do we put telescopes to have the best viewing conditions? 1. On Earth:

Problem with Telescopes on Earth? Problem: Particles of all sorts in the atmosphere block

2. In Space Solves atmosphere problem – CLEAR VIEW! Examples: Hubble, Cobe , Iras

Problem with telescopes in space? They’re in space! Hard to get to Hard to

Functions of a Telescope 1. 2. 3. 4. Collect Light Magnify Images Separate Distant

$I. OPTICAL TELESCOPES (USE VISIBLE LIGHT) Two types: 1. Refractor – BENDS LIGHT Invented$

TYPE 1 – REFRACTING TELESCOPE How does it work? a. b. It bends light

Type 2 – Reflecting Telescope a. Invented by Isaac Newton in 1668 b. Uses

2. Reflector – USES MIRRORS Cheap and common

Most Modern Telescopes combine technologies A. Examples a. b. Hubble Kepler http: //kepler. nasa.

Advantages of a reflector 1. only one side of the mirror. A. 2. (on

II. Non-optical Telescopes 1. Radio Telescopes a. Location – Earth (atmosphere does not affect

c. Size – very large because radio waves have a very long wavelength

d. Arrays – sets of multiple radio telescopes that allow for more data to

Ex – VLA (very large array) in Socorro, New Mexico 27 dishes. SETI– Search

Other Non-Optical Telescopes (all are satellites) 2. Infrared – IRAS launched 1983

3. Microwaves – COBE Cosmic Background explorer. Discovered evidence of the Big Bang. Launched

5. Gamma Rays – Observatory GRO Gamma Ray

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TELESCOPES

Telescopes n Write what is in YELLOW n You will be accountable for text in yellow on quizes.

Where do we put telescopes to have the best viewing conditions? 1. On Earth: CLEAR HIGH DRY COLD DARK

Problem with Telescopes on Earth? Problem: Particles of all sorts in the atmosphere block and cloud the view

2. In Space Solves atmosphere problem – CLEAR VIEW! Examples: Hubble, Cobe , Iras

Problem with telescopes in space? They’re in space! Hard to get to Hard to repair EXPENSIVE!!!

Functions of a Telescope 1. 2. 3. 4. Collect Light Magnify Images Separate Distant Objects Use as a Camera

$I. OPTICAL TELESCOPES (USE VISIBLE LIGHT) Two types: 1. Refractor – BENDS LIGHT Invented$

I. OPTICAL TELESCOPES (USE VISIBLE LIGHT) Two types: 1. Refractor – BENDS LIGHT Invented by Hans Lippershey in 1608 Refined by Galileo in 1609

Galileo demonstrating his telescope

Tololo Observatory - Chile

TYPE 1 – REFRACTING TELESCOPE How does it work? a. b. It bends light to create an image It uses two lenses 1. eyepiece (ocular) lens - small 2. objective lens - large

Draw it!

Type 2 – Reflecting Telescope a. Invented by Isaac Newton in 1668 b. Uses two mirrors Objective Mirror – Large Secondary (flat) mirror – Small c. Can be VERY LARGE 40 ft - 50 ft diameter objective mirror!

2. Reflector – USES MIRRORS Cheap and common

Draw It!

Most Modern Telescopes combine technologies A. Examples a. b. Hubble Kepler http: //kepler. nasa. gov/

Advantages of a reflector 1. only one side of the mirror. A. 2. (on a refractor the lens has two sides) – cheaper and distortion is less of a problem. The whole back of the mirror can be supported, therefore can be made very LARGE