In Nature
Most interstellar hydrogen is in the form of atomic hydrogen because the atoms can seldom collide and combine. They are the source of the important 21 cm hydrogen line in astronomy at 1420 MHz.
Read more about this topic: Nascent Hydrogen
Famous quotes containing the word nature:
“Rule of science: only exclude purpose, and Nature will reveal her causes.”
—Mason Cooley (b. 1927)
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—Eric Hoffer (1902–1983)