Initial considerations revolve around “What can we see from here?” You’ll note that the selections all avoid the galactic disk, where there is a relative density of gas, dust, and light pollution that would impact the integrity of an observation.
I imagine that they are also selecting targets based on efficiency (how close they are together), interest (what do scientists most want to see for research purposes), and ease (what do we know is going to give the biggest bang for the time investment).
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Initial considerations revolve around “What can we see from here?” You’ll note that the selections all avoid the galactic disk, where there is a relative density of gas, dust, and light pollution that would impact the integrity of an observation.
I imagine that they are also selecting targets based on efficiency (how close they are together), interest (what do scientists most want to see for research purposes), and ease (what do we know is going to give the biggest bang for the time investment).