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hey David, yes mate light and visual pollution imo
I dont mean to hijack your excellent thread, but this issue is important all over oz, not just sydney. In fact in sa this has been a hot topic for a fair bit longer than elsewhere prolly, due to us being the driestest state on the driestest continent and all that.
what i find amusing is that i never heard the astronomers complaining when cassini was launched with 10 kg of plutonium on board - and if it had exploded in the upper atmosphere when it took off, or when it did a close sling shot back past earth, could put enough radioactive material in the upper atmosphere to kill half the planet!
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