Does he though? Here's all I see - > "But wait," you might say. "The Moon's light isn't like the Sun's! The Sun is a blackbody—its light output is related to i

Does he though? Here's all I see - > "But wait," you might say. "The Moon's light isn't like the Sun's! The Sun is a blackbody—its light output is related to its high temperature. The Moon shines with reflected sunlight, which has a "temperature" of thousands of degrees—that argument doesn't work!" > It turns out it does work, for reasons we'll get to later. But the rest of the article is about etendue, and I don't see how the issue of reflected light is addressed (though possibly the answer is implied with an etendue argument I missed). I'm very curious now - it seems to me that if the Moon was a perfect mirror, you should be able to start a fire with it. Maybe the Moon's low albedo is the reason? Fun fact about the Moon: its albedo (roughly the fraction of incident light it scatters) is about the same as asphalt - not very reflective at all! [0] It just looks bright to us because the Sun is so tremendously bright. [0] - https://www.lcas-astronomy.org/articles/display.php?filename=albedo_effects&category=observing https://www.lcas-astronomy.org/articles/display.php?filename... , also learned this in an astronomy class