>>10869455Lava flows that have solidified certainly do. Lava flows on Earth tend to look black too, especially when there is a lot of light. Pic related
>>10870070It damn well could be. It's just difficult to make out the small hot spots with the limited resolution we have. Galileo took a picture of an active lava flow on Io and it was white. Meaning the lava was glowing so brightly in visible range it saturated the image sensor for those pixels:
https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA02545We can certainly detect heat sources on Io that should be hot enough to glow. Black bodies are still black bodies whether they are on earth or on a hellish moon.
