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:
“Making a logging-road in the Maine woods is called “swamping” it, and they who do the work are called “swampers.” I now perceived the fitness of the term. This was the most perfectly swamped of all the roads I ever saw. Nature must have coöperated with art here.”
—Henry David Thoreau (1817–1862)
“These are not the artificial forests of an English king,—a royal preserve merely. Here prevail no forest laws but those of nature. The aborigines have never been dispossessed, nor nature disforested.”
—Henry David Thoreau (1817–1862)