article_snippet.sent: If such structures do exist, such structures do exist would emit huge amounts of noticeable infrared radiation back on Earth.
article_snippet.sent: But as of yet, such a structure has not been detected.
article_snippet.sent: But Dr Wright Dr Wright said that ‘fundamental thermodynamics tells us that this energy must be radiated away as heat in the mid-infrared wavelengths’.
article_snippet.sent: Another possibility, of course, is that such civilisations simply don’t exist.