Larger objects are less numerous. Thus, there is about one hydrogen atom per cubic centimeter throughout the galaxy whereas there are very few large O-type stars.
"There are about ten times as many M-type red dwarfs as there are G-type stars like Korych or Sol." (p. 25)
A one-gram pebble is a thousand times more likely than a one-kilogram rock to hit a spaceship.
"...sunless planets are more common than suns." (ibid.)
Such "rogue planets" play big roles in "A Sun Invisible," Satan's World and Ensign Flandry, three installments of Poul Anderson's Technic History.
See:
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