115, No. 809, July 2003 The High‐Resolution Light‐polluted Night... The High‐Resolution Light‐polluted Night‐Sky Spectrum at Mount Hamilton, California This is the metadata section. Skip to content ...

And the use of these lasers is a reminder of how important it is to keep our sky’s light amount down as low as possible, as these measurements just wouldn’t be possible with a more polluted sky.

Dark Sky Massachusetts says around 60 Massachusetts communities have "adopted some form of outdoor-lighting regulation" to ...