Galileo Galilei was the first scientist to perform experiments in order to test his ideas. He was also the first astronomer to systematically observe the skies with a telescope.
<u>Galileo was the first scientist to invent the reflecting telescope</u>
<h2>Explanation:</h2>
Galileo was very concerned with astronomy and he made his own telescope to observe stars and heavenly objects. He used his newly invented telescope to discover four of the moons circling Jupiter, to study Saturn, to observe the phases of Venus, and to study sunspots on the Sun. His achievements include improvements to the telescope and consequent astronomical observations, and support for Copernicanism.
B the mass of the solar object determines whether the gravity of the object unless the solar object has Sonic property's such as a neutron star which can be the size of Pluto but have the mass of 900 solar masses
