I have a red one on my keyring, but I move so damn fast, people think it’s blue.
LOL
Actually, no, it’s not happening yet… it’ll take probably, erm, 87.3 years for the light to get there.
Unfortunately, unless we invent warp drive, we can’t beat the laser beam there and warn him. 
Mangetout - ha!
Mine is red. I don’t think I’ve ever seen a green one, but now I want one.
Everyone knows about laser pointers and cats, but I highly recommend laser pointers + fish. Entertaining. I am not sure what would have happened if the aquarium officials had noticed, so I suggest being surruptitious.
Red. But I’ve seen sort of white things-- maybe not lasers but some sort of light pointer-- used because of colorblindness. I always ask students to let me know if they can’t see the pointer. I knew an architectural history prof who was colorblind and stuck with the 10-foot bamboo pole.
The current greens really suck the batteries. A prof of mine used one in lecture, and it would barely last an hour before dimming.
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- I have read on astronomy forums that the greens don’t tend to last very long. After just a few months of occasional use, they get dimmer, and stay dimmer. It isn’t a matter of the batteries needing replacement…
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- I have read on astronomy forums that the greens don’t tend to last very long. After just a few months of occasional use, they get dimmer, and stay dimmer. It isn’t a matter of the batteries needing replacement…
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Yep. As I said above, green and blue laser pointers currently not actually green or blue diode lasers, but are instead what are known as DPSS (diode pumped solid state) lasers. The work by exciting specially doped crystal materials into fluorescence. Unfortunately, these materials aren’t very stable, so that over time, the fluorescence dims. Eventually, I’m sure they’ll develop actual green and blue laser diodes, just like with LEDs and that problem will disappear. So to speak. Heh.
I guess that depends on which stars you’ve been pointing at and how long you’ve up to this reckless behaviour.