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#2 V

The Petrova line may not be real (thankfully), but real astronomical instruments are capable of detecting infrared light at 25.984 microns.

For example, the Mid-Infrared Instrument (MIRI) aboard the James Webb Space Telescope contains a camera and a spectrograph that capture light in the 5 to 28 micron range.

The Eagle Nebula’s famous “Pillars of Creation” as imaged by MIRI: Many layers and pillars of semi-opaque gas and dust overlay one another. These regions appear light blue and dark gray-blue. The first pillar starts at the bottom left and extends to the top right. There is one prominent red star, with tiny spikes at its tip. Lower on this pillar, there are several darker areas of dust that jut out, many with bright red stars that appear as small red dots at their ends. Below the top pillar are two slightly smaller pillars, both ending in dark gray-blue regions. The second pillar has a dark arch that looks like an upside-down L halfway down. The background of this scene is washed in shades of red. Toward the top center is a V shape. At its lowest point, the V is a brilliant red. There are only several dozen tiny bright white and blue stars in this overall scene. Larger stars appear redder and are embedded in the pillars - from Webbtelescope.org

There is a very faint, but detectable line in the solar system that emits infrared light at the 25.984 micron wavelength.

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