Galileo was a natural philosopher, astronomer, and mathematician. He also made revolutionary telescopic discoveries, including the four largest moons of Jupiter.
Most of this gas is hydrogen (about 70%) and helium (about 28%).
Carbon, nitrogen and oxygen make up 1.5% and the other 0.5% is made up of small amounts of many other elements such as neon, iron, silicon, magnesium and sulfur.
America is named after Amerigo Vespucci, the Italian explorer who set forth the then revolutionary concept that the lands that Christopher Columbus sailed to in 1492 were part of a separate continent.
