what is an airplane made out of and how do they put it all together from the fuselage to the electronics in the plane, Please with all the boring details.
Hence, prior to the invention of the telescope, nothing was known about the planet besides its position on the sky. The Italian scientist Galileo Galilei was the first person known to use a telescope to make astronomical observations. His records indicate that he began observing Mars through a telescope in September 1610.
7. The Discovery. Galileo, arguably the most important scientist ever, used a fancy telescope he half invented and half stole the idea for to discover four moons orbiting Jupiter in 1610. They were the first moons of another planet to be spotted, making them a landmark discovery.