The telescope, especially for astronomical observation.
He got a toy from the carnival. and made it into a telescope by putting in a magnifying glass in it.
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Galileo's invention of the telescope helped him observe the phases of Venus, the moons of Jupiter, and sunspots, which provided evidence for the heliocentric model proposed by Copernicus. These observations challenged the geocentric view of the universe and supported the idea that the Earth revolves around the Sun.
The astronomical telescope.
Galileo's observations through his telescope, such as the phases of Venus and the moons of Jupiter, provided evidence for the heliocentric model proposed by Copernicus. These discoveries supported the idea that Earth was not the center of the universe and that there were other celestial bodies orbiting around the Sun.
Galileo Galilei provided evidence in support of Copernicus' heliocentric theory through his observations of the moons of Jupiter and the phases of Venus. His work helped to validate the heliocentric model and contributed to the eventual acceptance of the theory.
Copernicus put forward a model of the solar system with the Sun at the centre, which was repeated by Galileo. It remained a theory until after further refined theories and observations by Isaac Newton and others showed that the Sun is much more massive than the planets and must therefore stay at the centre.
The invention of the telescope by Galileo Galilei in the early 1600s helped early scientists discover more planets. By using telescopes to observe the night sky, astronomers were able to see celestial objects more clearly and detect planets that were previously invisible to the naked eye.