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:
“As there is a degree of depravity in mankind which requires a certain circumspection and distrust, so there are qualities in human nature which justify a certain portion of esteem and confidence.”
—James Madison (1751–1836)