What is Black? Stephen M. Pompea National Optical Astronomy Observatory Tucson, Arizona USA Stephen M. Pompea National Optical Astronomy Observatory Tucson,

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Presentation transcript:

What is Black? Stephen M. Pompea National Optical Astronomy Observatory Tucson, Arizona USA Stephen M. Pompea National Optical Astronomy Observatory Tucson, Arizona USA NOAO Public Affairs and Educational Outreach

Dark Night Skies: Kitt Peak and the Tohono O’Odham Nation

“This space telescope is not working as well as we would like!”

Spitzer Space Telescope in the Clean Room

Spitzer Infrared Space Telescope

Overview of Talk Why do we need black surfaces? Is black a color? How do we make something become “black”? Examples of black surfaces Designing surfaces--micro-architect?

Is Black a Color? Yes, but …. Black depends on light levels We can measure “blackness”

Kinds of Surfaces-vocabulary “Diffuse” (rough) “Specular” (smooth) They reflect light very differently!

Reflections are everywhere--even glass lenses reflect

Coatings are important for telescopes

Painted Surface Up Close

Tungsten Hexafluoride (Grown surface)

Etched Surface (nickel)

Cross sectional view of surface

Anodized Surface (Martin Black)

How things look depends on the wavelength …

Graphs Speak to You!

New Surface for Absorbing

What is black? Non-reflective and absorptive Black is related to wavelength Specular black surfaces and diffuse black surfaces Surfaces roughness helps make a surface black

Come Visit Kitt Peak!