Quiz · Telescopes and Distant Galaxies

Question 1What is the main idea of this talk?

How to build a simple telescope at home Why the Hubble telescope was so expensive The stars that belong only to the Milky Way How telescopes have developed and what they reveal about distant galaxies

Question 2Why do astronomers want telescopes with bigger mirrors?

Bigger mirrors gather more light, revealing fainter and more distant objects Bigger mirrors are cheaper to build than small ones Bigger mirrors can block out the city lights Bigger mirrors can also magnify sounds from space

Question 3What can we infer from the fact that light from distant galaxies has travelled for billions of years?

Those galaxies have already disappeared Telescopes work too slowly to catch them Observing them means looking far back in time Light moves more slowly in deep space