As far as I can tell, all of the effects are positive. Why is there an option for turning the observatories off?
Observatory (1)
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Increases the chance of the astronomical events by 0.5%, +25% to the science
output, +1K to the max science. Turning off observatories will only disable
event bonus.
scaffold 0.06 / 55.00
slab 38.50
iron 825.00
science 1100
Effects:
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Science bonus (%): 0.25
starEventChance: 20
starAutoSuccessChance: 1
Max Science: 1000
Yearning to one day catch the red light fairy