Astronomy 100

What’s the ‘Scope?

• ANSWER NOW: Sketch a telescope.

• SECOND GOAL: understand why we need telescopes, how a telescope works, and that you need different scopes for different reasons/types of light.

Here are 3 Telescopes

• Split into 3 groups. One person record. One person report back. Everyone contribute.

• Identify the different parts of your telescope. You don’t need to use the right words, but pick out and give a name to each of the parts you think is important.

• Good Example: the tube – very important.• Bad Example: the screws holding something

together. Do I care? No.

• Do the different telescopes have all the same parts, or are there differences?

Galileo

• http://www.marcdatabase.com/~lemur/lemur.com/gallery-of-antiquarian-technology/philosophical-instruments/galileo-singer/galileo-telescopes-150-434-830.jpg

Refractor

• Lenses• http://mmejia28.wordpress.com/2008/09/07/project-i/

Reflector

• Mirrors• http://www.camcentre.co.uk/shop/index.php?act=viewProd&productId=29

Cassegrain/Folded Optics

• Mirrorsand

• Lenses

What does a telescope DO?

• Main lens/mirros– Collect LOTS of light, focus it down.– NOT MAGNIFYING

• Eyepiece– MAGNIFIES– Bigger number, bigger eyepiece, less

magnification

http://www.everythingweather.com/atmospheric-radiation/transmissionwindow2.gif

Atmospheric Absorption

Hubble (Visible)

http://chandra.harvard.edu/graphics/resources/illustrations/chandra_trw_300.jpg

Chandra (X-Ray)

Arecibo (Radio)

James Webb (Infrared)

http://jwst.gsfc.nasa.gov/images_jwst.html

Why is Hubble in Space?

• Seeing

Why is Chandra in Space?

• Can’t do X-Rays from here

• http://www.uk-telescopes.co.uk/beginners_guide%20to%20telescopes.htm

• http://www.nasa.gov