A gigajoule is a billion joules. The joule is a unit of energy

About a gigajoule per kilogram.

1 gigajoule has enough energy to power the human body 50 lifetimes

One billon. 1 joule X 1000 = 1 kilojoule = 1000 J 1 kilojoule x 1000 = 1 megajoule = 1000000 J 1 megajoule X 1000 = 1 gigajoule = 1000000000J

Exactly the same as it did 2 hours ago:

100,000 picojoules

0.1 microjoule

0.0001 millijoule

0.0000001 joule

0.0000000001 kilojoule

0.0000000000001 megajoule

0.0000000000000001 gigajoule