By looking into space with the telescope.
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.
Data gathered using Galileo's early telescope, such as observations of the phases of Venus and the moons of Jupiter, provided evidence supporting the heliocentric model. These observations showed that not all celestial bodies orbit the Earth, as previously believed, but instead supported the idea that they orbited the Sun. This challenged the geocentric view and provided observational proof for the heliocentric model proposed by Copernicus.
Galileo developed the telescope, which allowed him to observe celestial bodies such as the moons of Jupiter and the phases of Venus. These observations provided evidence to support the heliocentric theory proposed by Copernicus.
By looking into space with the telescope.
The telescope
Galileo
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.
The popular answer to this question would be Galileo. However, contrary to popular belief Galileo did not invent the telescope. He built his own telescope about a year after their initial creation and later made significant improvements.
Data gathered using Galileo's early telescope, such as observations of the phases of Venus and the moons of Jupiter, provided evidence supporting the heliocentric model. These observations showed that not all celestial bodies orbit the Earth, as previously believed, but instead supported the idea that they orbited the Sun. This challenged the geocentric view and provided observational proof for the heliocentric model proposed by Copernicus.
Galileo developed the telescope, which allowed him to observe celestial bodies such as the moons of Jupiter and the phases of Venus. These observations provided evidence to support the heliocentric theory proposed by Copernicus.
Copernicus' heliocentric model provided the framework for Galileo to further explore and confirm through his observations with the telescope. Galileo's discoveries, such as the moons of Jupiter and the phases of Venus, provided empirical evidence in support of the heliocentric model and contributed to its acceptance over the geocentric model.
Galileo's observations with his telescope supported the concept of heliocentricism. He noted that the satellites of Jupiter and Venus, based on their range of phases, did not match geocentricism supported by Ptolemy. He noted that based on these findings, that the Heliocentric theory was correct.
I suspect the answer you're looking for is Galileo Galilei. It just has two problems: Galileo didn't "invent the telescope", nor did he "develop a heliocentric view of the universe." The telescope was invented in the Netherlands; Galileo simply improved on it and was probably the first to apply it to astronomical observations instead of just looking for distant ships. Also, Copernicus is (properly) credited with the heliocentric view; Galileo's observations supported this, but he didn't come up with it.
Galileo Galilei . He only helped support the theory through his observations , he didn't invent the model, Copernicus did.
One notable astronomer during the Renaissance was Nicolaus Copernicus, who developed the heliocentric model of the universe. Another significant astronomer was Galileo Galilei, who made important observations with the newly invented telescope, providing evidence in support of the heliocentric theory.