Astronomers consider a lot of things when deciding where to build telescopes. Which of the following are important part of how astronomers select places for new telescopes? Select all that should be considered from the list below.
1) dark skies (no light pollution)
2) quiet and non-turbulent air
3) dry (desert-like) conditions
4) proximity to a college campus
5) clear weather on as many nights as possible
6) high altitude locations