The Delaware Gazette

Spectral lines

About 98 per­cent of the cos­mos is com­posed of the two sim­plest ele­ments, hydro­gen and helium, mostly in the form of giant gas clouds and stars.

Spectral lines

Go out and look at any star in the night­time sky, and you are look­ing at an incom­pre­hen­si­bly huge hydro­gen bomb. Go ahead. Look. I’ll wait.

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