5. Which scientist's observations supported the hellocentric theory of the solar system? A. Copernicus B. Gallleo Galllel C. Johannes Kepler D. Robert Boyle

## Step 1<br />The heliocentric theory of the solar system is the astronomical model in which the Earth and planets revolve around the Sun at the center of the Solar System. This theory was first proposed by Nicolaus Copernicus in the 16th century.<br />## Step 2<br />However, it was Galileo Galilei who provided observational evidence that supported this theory. He observed the moons of Jupiter, which were not visible from Earth, and this provided evidence that not all celestial bodies revolve around the Earth.<br />## Step 3<br />Therefore, the scientist whose observations supported the heliocentric theory of the solar system is Galileo Galilei.