follow Dictionary.com

Why is the ninth month called September?

interplanetary medium

thinly scattered matter that exists between the planets and other bodies of the solar system, as well as the forces (e.g., magnetic and electric) that pervade this region of space. The material components of the interplanetary medium consist of neutral hydrogen, plasma gas comprising electrically charged particles from the Sun, cosmic rays, and dust particles

Learn more about interplanetary medium with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of the Day

Word Value for interplanetary

19
22
Scrabble Words With Friends