All Questions
3 questions
2
votes
1
answer
80
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What determines the surface material of the ALMA and Spitzer telescope?
The transition between metal dish and mirror happens around hundreds of microns. For example, the shortest wavelength the ALMA(metal dish) can detect is about 0.3mm, while the longest wavelength the ...
- 3,157
3
votes
2
answers
164
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Can a telescope detect a blackbody?
I'd like to determine the distance at which a telescope with a certain set of parameters (sensitivity, collector area) can detect a blackbody with certain other parameters (temperature, emitting area)....
- 76
8
votes
2
answers
395
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What makes small interferometers useful? Like NIRISS on JWST
NIRISS is an instrument on the James Webb Space Telescope. It has a "non-redundant aperture mask" which obviously covers most of the area of the sensor. It seems to be advantageous for high contrast ...
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