SOFIA's Mirror
The candy-dish appearance of this high-tech
astronomical mirror is striking.
Made of a special glass ceramic material called
Zerodur,
it actually measures 2.7 meters across.
The transparent surface has not yet received a reflective
coating, so the weight-reducing internal
honeycomb structure is visible with
attractive blue and yellow tints provided by a
protective tarp and background lighting.
Recently
unveiled, the telescope mirror is destined to fly on the
Stratospheric Observatory For Infrared Astronomy
(SOFIA).
Since water vapor in Earth's
troposphere tends to block
infrared light,
SOFIA will
operate from a modified
Boeing 747 jetliner
at altitudes above 40,000 feet.
As the largest airborne observatory in the world, SOFIA
will explore a host of cosmic environments
including sites of star
birth and
death, the formation of distant solar
systems, and black holes in active
galaxies.