3 ms·
Can we detect tiny amounts of blackbody radiation? Not that such a sphere would release tiny amounts, but I'm curious about this as well.
by haolez 7y ago
Can we detect tiny amounts of blackbody radiation? Not that such a sphere would release tiny amounts, but I'm curious about this as well.
- deleted 7y ago[deleted]
- evanb 7y agoWe can detect the CMB which, using the Stefan-Boltzmann law [s-b] and a CMB temperature of 2.725 K, is about 3.12e-6 Watts/square meter. But, the CMB is pervasive. The blackbody sphere you're asking about is very far away, and the amount of power you'd receive scales like the inverse square of the distance from the sphere to us here. So forget it, the CMB's blackbody energy flux on/near Earth is ENORMOUS compared to the star's. [s-b] https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_law https://en.wikipedia.org/wiki/Stefan%E2%80%93Boltzmann_law