Telescopes

Telescopes — page 3 — After hearing about the Dutch invention Italian physicist Galileo Galilei built his own telescope Galileo's telescope used two lenses to concentrate light A convex primary lens curved outward A concave eyepiece lens curved inward This delivered more light to the human eye than it could collect alone The lens refracted the light and formed an image This type of telescope became known as a telescope refracting

Telescopes — page 4 — Galileos telescope could magnify objects 20 times Still it was not perfect The spherical shape of its primary lens made images blurry Also the lens split light into many colors This created a ring of color around a bright image This painting shows Galileo Galilei showing people how to use his telescope to view the sky night

Telescopes — page 5 — Galileo became the first person to use a telescope to study the sky Through his telescope he could see mountains and craters on the moon He discovered four large moons around Jupiter He saw sunspots on the sun He also saw a ribbon of light across the sky This was the Milky Way galaxy Galileo Galilei was the first person to see the four largest moons of Jupiter Io Europa Ganymede and Callisto through his telescope in 1610 Galileo Galilei Galileo Galilei was an Italian mathematician philosopher physicist and astronomer Galileo conducted scientific experiments to test his hypotheses He is often considered the father of modern science He is also credited with developing modern astronomy 1564

Telescopes — page 6 — Galileo used his telescope to make observations He drew conclusions about the objects he saw Galileo’s telescope opened the door for astronomy Astronomy is the study of celestial objects such as the sun moon and stars Since the telescope’s invention knowledge about the universe has grown greatly Revolving Around the Sun Before Galileo’s telescope many people believed the sun revolved around the Earth Galileo’s discoveries proved the Earth and other planets revolved around the sun 9

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