
Named for the Greek god of the sun, Helios, Helium is the second most abundant element in the universe. Scientists discovered helium while they were studying the sun. A colorless and odorless gas, helium is so light it floats in air. At first scientists couldn't decide if helium...

Named for the Greek god of the sun, Helios, Helium is the second most abundant element in the universe. Scientists discovered helium while they were studying the sun. A colorless and odorless gas, helium is so light it floats in air. At first scientists couldn't decide if helium...