Afterglow

In the late 1940s, George Gamow, a Russian-American physicist, conceived of the Big Bang theory as we know it today. He and his colleagues proposed that if a big bang had occurred, it would have left an afterglow, traces of background radiation that would still be present.

Source: tatoeba (3957955)

When she had gone Mr. Harrison watched her from the window . . . a lithe, girlish shape, tripping lightheartedly across the fields in the sunset afterglow.

Source: tatoeba (7917343)

That the sunset in Egypt is gorgeous, every body knows; but I, for one, was not aware that there is a renewal of beauty, some time after the sun has departed and left all grey. […] everything begins to brighten again in twenty minutes;—the hills are again purple or golden,—the sands orange,—the palms verdant,—the moonlight on the water, a pale green ripple on a lilac surface: and this after-glow continues for ten minutes, when it slowly fades away.

Source: wiktionary

Let my thoughts come to you, when I am gone, like the afterglow of sunset at the margin of starry silence.

Source: wiktionary