telescope, he used this to observe different heavenly bodies
The phases of Venus and the retrograde motion of Mars on the celestial sphere.
By looking into space with the telescope.
None of it but Galileo's discoveries with the telescope were very important in raising questions about the old Ptolemaic theory, which was geocentric. However Galileo's discovery of Venus's phases was not a proof of the heliocentric principle because Tycho produced a geocentric model that explained Venus's phases.
He proved the heliocentric model to be right about the Sun being in the center of the solar system and not the Earth.
Copernicus produced his model with the Sun at the centre in 1543, and then in 1609 Kepler produced the model that we use now. Kepler's model also uses the idea of having the Sun at the centre. No-one proved anything but after Newton's discoveries in physics it was realised that Kepler's model fitted exactly with Newton's later theories in gravity and dynamics, so that's why it became accepted, and it still is.
The Bible is written from an implicitly geocentric viewpoint, so if we take the Bible as the ultimate authority on everything, then it would be wrong to come to other conclusions such as the heliocentric theory, merely by observing the way the universe actually is. Incidentally, although Galileo did support the heliocentric theory, it was originally proposed by Copernicus. It isn't Galileo's model. Galileo did contribute to this theory with his astronomical observations, however.
Galileo
It was accepted.
No, Nicolaus Copernicus proposed it 21 years before Galileo was born.
Galileo Galilei . He only helped support the theory through his observations , he didn't invent the model, Copernicus did.
Copernicus proposed it, Galileo fought for it. It is called the Heliocentric model.
By looking into space with the telescope.
Galileo and Copernicus
Galileo's work came into conflict with the church because he advocated a heliocentric model of out solar system. This conflicted with what it says in The Bible.
Galileo's work came into conflict with the church because he advocated a heliocentric model of out solar system. This conflicted with what it says in The Bible.
Galileo Galilei was the first to discover this.
None of it but Galileo's discoveries with the telescope were very important in raising questions about the old Ptolemaic theory, which was geocentric. However Galileo's discovery of Venus's phases was not a proof of the heliocentric principle because Tycho produced a geocentric model that explained Venus's phases.
Galileo Galilei