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Human hair width: 70 microns JWST observing band: 0.6 to 28 microns, ~0.1-0.5 hair width (2-10 waves/hair) Visible spectrum = 0.4 to 0.7 microns, ~0.05-0.1 hair (10-20 waves/hair) Hydrogen atom size = 1 angstrom = 10^-4 micron, = 700,000/hair Just practicing fermi estimation
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Human body heat is around 12 microns, right in the middle of JWST pass band. Clearly JWST is secretly a night vision spy cam 🤯
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C02 absorption is 15nm… it’s a climate change observatory! Kidding aside, sadly JWST can’t look at earth at all since it is at L2 and looking at earth = looking at sun = too much heat = telescope is blinded. That huge heat shield is a bigger deal than the telescope itself.
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Here’s a gif of increasing absorption at 13-15 micron due to C02
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This GIF took 3 years to make. Python/Jupyter #dataviz of 17 years (1,400 GB) of 🛰️ measurements, visualized in 17 seconds. This is the first analysis of 🌎 outgoing IR declining at 13-15μm due to rising CO₂. Warming at 10-13μm is also evident.
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GIF
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