How did Galileo's discoveries help support the heliocentric theory?

Galileo discovered evidence to support Copernicus' heliocentric theory when he observed four moons in orbit around Jupiter. Beginning on, he mapped nightly the position of the 4 "Medicean stars" (later renamed the Galilean moons).

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Accordingly, how did galileo's observations of venus demonstrate that our solar system orbits around the sun rather than the earth?

Galileo's observations of Venus also supported the heliocentric system. Galileo knew that Venus is always seen near the sun. He discovered that Venus goes through a series of phases similar to those of Earth's moon. But Venus would not have a full set of phases if it circled around Earth. Keeping this in consideration, are used to measure distances between planets in our solar system? Astronomical units, abbreviated AU, are a useful unit of measure within our solar system. One AU is the distance from the Sun to Earth's orbit, which is about 93 million miles (150 million kilometers).

How do we measure distances in space?

Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun. In respect to this, how do we measure the distance of the star from us using the measurement of their brightness? By comparing the intrinsic brightness to the star's apparent brightness, we can get a good measure of the star's distance by applying the 1/r^2 rule. The 1/r^2 rule states that the apparent brightness of a light source is proportional to the square of its distance.

What technique is used in studying the motion of stars and search for double stars?

The technique is called asteroseismology. What is the parallax technique? The parallax technique determines distance by measuring the angle of apparent shift in an object's position, as seen from opposite sides of Earth's orbit around the Sun.