The article mentions thats the next step
replyDoesn't everything emit heat? :)
replyno, the vacuum of space does not emit heat
replyInterstellar space behaves as an almost perfect blackbody radiator, at a temperature of 2.725 Kelvin, due to the cosmic microwave background. As such, it does "emit heat", albeit an extremely small, but measurable amount.
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replyLet me answer your question with a question: Does the infrared camera detect emitted heat?
replyNot clear where your question is coming from, but it detects heat that's emitted as infrared radiation.
replyGenerally? Yes.
replyIn this case? No idea.