Astronomy Picture of the Day

A Telescope Laser Creates an Artificial Star

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#66613 by @ 08.02.2005 00:00 - nach oben -
A Telescope Laser Creates an Artificial Star

What do you get when you combine one of the world's most
powerful telescopes
with a powerful laser?

An artificial star.

Monitoring fluctuations
in brightness of a genuine bright star can indicate how the
Earth's atmosphere is changing,
but many times no bright star exists in the direction where
atmospheric information is needed.

Therefore, astronomers have developed the ability to create an
artificial star where they need it -- with a

Subsequent observations of the
artificial laser guide star can reveal information so
detailed about the blurring effects of the Earth's atmosphere
that much of this blurring can be removed by rapidly flexing the mirror.

Such adaptive optic techniques allow high-resolution
ground-based observations of
real stars,
and the early universe.

Above, a laser
beam shoots out of the
Keck II 10-meter telescope on Mauna Kea in
in 2002, creating an artificial star.

Credit & Copyright
#66614 by @ 08.02.2005 00:01 - nach oben -
scheisse, d'barbara isch hüt wieder andersch schnell gsi, ha gar nöd mitübercho wiä si sich igloggt het!
#66615 by @ 08.02.2005 00:02 - nach oben -
gsehsch nüme richtig?
#66617 by @ 08.02.2005 00:46 - nach oben -
schints hä