the.com/afterglow

proof that the best part of a thing often arrives once it's over

means The warm light or feeling that lingers after something has ended — whether the glow in the sky after sunset, the heat left in embers, or the contentment that outlasts a happy moment.

from A plain compound of "after" and "glow," both deep-rooted Old English words: "æfter" meaning behind or following, and "glōwan," to shine with heat. The literal sense — the light that remains in the sky once the sun has gone — came first; the emotional sense, that residual warmth of a pleasure already past, followed naturally, since the sky had already taught us the shape of the idea.

sky physics
sunlight scattering off high dust after the sun is gone
volcanic boost
big eruptions paint afterglows vivid red for years
astronomy term
gamma-ray bursts leave fading afterglows across the spectrum
body chemistry
oxytocin and prolactin flood the brain post-intimacy
for instance

perseids meteor shower — annual meteor shower peaking in august with visible glowing trails across the sky

noctilucent clouds — icy clouds at 80km altitude that glow electric blue after sunset in polar regions

bioluminescent dinoflagellates — glowing plankton in bioluminescent bays like mosquito bay, puerto rico that emit light when disturbed

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