eso.org— On January 28, a laser beam of several watts was launched from Yepun, the fourth 8.2m Unit Telescope of the Very Large Telescope, producing an artificial star, 90 km up in the atmosphere.
Feb 23, 2006View in Crawl 4
Errrr..."a laser beam of several watts was launched" What? "several" ???? Be more vague, please."The laser beam, shining at a well-defined wavelength, makes the layer of sodium atoms that is present in Earth's atmosphere at an altitude of 90 kilometres glow."This does not a star make.
"correction...I didn't see the image before my previous comment"yeah.. then don't correct me."In fact having a shorter exposure would force a higher ISO and cause the grain,so your statement is incorrect."Having a shorter exposure wouldn't in fact force a higher ISO at all, unless you're implying that while taking a night photo with your film speed set on auto,the film speed adjusted itself for a shorter exposure.. then yes I guess it would. Which on a digital SLR, is only making the ccd more sensitive to light as you and I have agreed, thus exposing the camera to a "weak signal" collecting "more background electrical noise". So no, those aren't just hot pixels. Photo's tend to only experience one or two "hot pixels", as you can see in the link you probably just googled. Sorry, being a photographer, misinformation pisses me off too. :D
They once put a powerful green laser near the big geodesic sphere (from expo '67) found here in Montreal.It was angled at 45 degrees toward the sky. Once I was there at night with friends, and saw a curious phenomena, the laser seemed to curve. If you followed the laser with your eyes from the base up to the sky, you found it ended up going "down" over the city's horizon in the background. Can anyone here explain why this happens? Is it an optical illusion, or is it gravity curving space?
Closed AccountFeb 23, 2006
wow, thats is amazing! nice find dude...dugg
potiferFeb 23, 2006
Errrr..."a laser beam of several watts was launched" What? "several" ???? Be more vague, please."The laser beam, shining at a well-defined wavelength, makes the layer of sodium atoms that is present in Earth's atmosphere at an altitude of 90 kilometres glow."This does not a star make.
sparrow88Feb 23, 2006
I feel it. I feel the cosmos.
foxhoundadminFeb 24, 2006
don't look directly into the tiny "star" a million billion bagillion times smaller than the sun, or it'll burn your retina, bobby!
nikonFeb 24, 2006
"correction...I didn't see the image before my previous comment"yeah.. then don't correct me."In fact having a shorter exposure would force a higher ISO and cause the grain,so your statement is incorrect."Having a shorter exposure wouldn't in fact force a higher ISO at all, unless you're implying that while taking a night photo with your film speed set on auto,the film speed adjusted itself for a shorter exposure.. then yes I guess it would. Which on a digital SLR, is only making the ccd more sensitive to light as you and I have agreed, thus exposing the camera to a "weak signal" collecting "more background electrical noise". So no, those aren't just hot pixels. Photo's tend to only experience one or two "hot pixels", as you can see in the link you probably just googled. Sorry, being a photographer, misinformation pisses me off too. :D
vtwinFeb 25, 2006
They once put a powerful green laser near the big geodesic sphere (from expo '67) found here in Montreal.It was angled at 45 degrees toward the sky. Once I was there at night with friends, and saw a curious phenomena, the laser seemed to curve. If you followed the laser with your eyes from the base up to the sky, you found it ended up going "down" over the city's horizon in the background. Can anyone here explain why this happens? Is it an optical illusion, or is it gravity curving space?