Optical telescopes
Channel: Astronomy with Mr Guerin
Date: 2020-09-29

What kinds of optical telescopes are there? What can we see with a telescope in the night sky? How can we decide how good a telescope is?

This video will tell you everything you need to answer these questions in EdExcel's Astronomy GCSE.

Download the slideshow:
https://drive.google.com/drive/folders/1v7n69srfzFmgYxF9Vct6FKp3r_ZRqFjx

Seeing conditions forecast:
https://www.meteoblue.com/en/weather/outdoorsports/seeing


Image credits:

Gran Telescopio, Pachango, wikimedia, CC BY-SA 3.0
https://commons.wikimedia.org/wiki/File:Grantelescopio.jpg

Human eye, ROTFLOLEB, wikimedia, CC BY-SA 3.0
https://commons.wikimedia.org/wiki/File:Human_eye_with_blood_vessels.jpg

Eye diagrams, Mr Guerin

AN Zaev eye patch, unknown author, wikimedia, public domain
https://commons.wikimedia.org/wiki/File:AN_Zaev.jpg

Seeing conditions 2r0, 7r0 and 20r0, Rnt20, wikimedia, public domain (altered)
https://commons.wikimedia.org/wiki/File:Ast_seeing_2r0.png
https://commons.wikimedia.org/wiki/File:Ast_seeing_7r0.png
https://commons.wikimedia.org/wiki/File:Ast_seeing_20r0.png

Telescope diagrams, Mr Guerin

Chromatic aberration on pendant, Slavica Panova, wikimedia, CC BY-SA 3.0
https://commons.wikimedia.org/wiki/File:Filigranski_nakit_02_edit.JPG

Yerkes Observatory, Jtakemann, wikimedia, public domain
https://commons.wikimedia.org/wiki/File:Yerkesobservatoryfromair.jpg

Airy disk spacing, Spencer Bliven, wikimedia, public domain
https://commons.wikimedia.org/wiki/File:Airy_disk_spacing_near_Rayleigh_criterion.png

Jupiter,  NASA, ESA, and A. Simon (Goddard Space Flight Center), hubblesite.org, public domain
https://hubblesite.org/contents/media/images/2014/24/3372-Image.html?news=true

Naked eye vs telescope images, Mr Guerin, Stellarium