Our solar system has eight planets and more than 200 natural satellites surrounding them.
Jupiter, one of the best-known planets, has 80 of these moons.
On this day in history, January 7, 1610, Galileo discovered Jupiter's moons. This was the first observation of this planet.
On this day in history, January 6, 1941, FDR gave four free speeches that led Americans into World War II.
According to Britannica, Galileo Galilei was an Italian philosopher and astronomer born in 1564 in Pisa, Italy.
After moving to Florence at an early age, Galileo attended school and later studied medicine at the University of Pisa.
The first person to discover Jupiter's moons was the Italian philosopher Galileo Galilei. (AP)
While there, he became interested in mathematics and eventually dropped out of university without earning a degree and worked on his own.
On this day in history, December. On November 1972, Apollo 17 astronauts became the last humans to walk on the moon.
Still, Galileo was constantly teaching himself new skills and facts, reports Britannica.
Galileo is best known for building powerful telescopes, one of which he used to discover the four moons surrounding Jupiter.
A view of Jupiter from the early stages of the Voyager 1 mission. Also visible are his two Galilean satellites, Io and Europa (left to right). (COBIS/Corbis via Getty Images)
On January 7, 1610, Galileo discovered four moons orbiting Jupiter. This discovery would change his life forever.
According to National Geographic, these four moons are Jupiter's largest moons: Rho, Europa, Ganymede, and Callisto, also known as the Galilean moons.
On this day in history, July 29, President Eisenhower signed the bill establishing NASA.
This discovery helped prove that the Earth actually revolves around the sun, a fact that was not accepted at the time.
Galileo created a telescope that was used to view Jupiter's moons. (AP)
A few years later, Galileo faced charges for believing in and defending the Copernican theory, the idea that the Earth revolves around the sun.
This theory was in sharp contrast to the teachings of the Roman Catholic Church at the time.
Click here to sign up for our lifestyle newsletter
He eventually pleaded guilty and was placed under indefinite house arrest by Pope Urban VIII, according to History.com.
On this day in history, January 7, 1610, Galileo discovered Jupiter's moons. (CORBIS/Corbis via Getty Images/AP Newsroom)
He lived the rest of his life in a villa near Florence until his death on January 8, 1642.
Jupiter is the fifth planet from the sun and is by far the largest planet in the solar system, according to NASA.
CLICK HERE TO GET THE FOX NEWS APP
What about the giant red spot on Earth?
According to NASA, this is a massive storm larger than Earth and has been growing for hundreds of years.
For more lifestyle articles, visit www.foxnews.com/lifestyle..
