Hydrogen and Helium

Hydrogen is an element, usually in the form of a gas, that consists of one proton and one electron. Hydrogen is the most abundant element in the universe, accounting for about 75 percent of its normal matter, and was created in the Big Bang. Helium is an element, usually in the form of a gas, that consists of a nucleus of two protons and two neutrons surrounded by four electrons. Helium is the second-most abundant element in the universe, after hydrogen, and accounts for about 25 percent of the atoms in the universe. Most of the helium in the universe was created in the Big Bang, but it is also the product of hydrogen fusion in stars.

Radio Programs

Moon and Jupiter Creating a powerful magnetic field Monday, February 10, 2014
Unicorn Stars Impressive stars for the unicorn Wednesday, February 24, 2010
Cone Nebula A dark pillar of starbirth Tuesday, February 23, 2010
Carbon Making a basic ingredient of life Wednesday, August 12, 2009
Helium Floating through the heart of the Sun Tuesday, August 11, 2009
Nucleosynthesis Mixing up a chemical stew Monday, August 10, 2009

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