He made significant astronomical discoveries, including the planet Uranus

Hooke was the first to construct a Gregorian reflecting telescope, which is one of the interesting facts about Robert Hooke. He created the earliest known description of the planet Uranus using this telescope. He also developed several theories concerning the rotation of Jupiter and gravity, as well as the first double-star system, known as Gamma Arietis. He then created a helioscope to use sunspots to gauge the sun's spin. He created sketches of Mars that were eventually used to calculate its rotational period. He witnessed multiple comets and posed several significant concerns regarding them, such as why the tail of each comet faces away from the sun and how a comet that is burning could continue to burn for so long in an environment devoid of oxygen.

Hooke not only found Uranus, but Hooke also developed the Theory of Planetary Motion. He came up with the idea after solving a mechanical puzzle. One of the strongest postulates he made in expressing the laws of universal attraction was that all bodies travel in a straight line until they are deflected by another force, which will cause them to move in the form of a circle, ellipse, or parabola. He said that everybody has their gravitational pull at its center or axis and that this pull is amplified by the gravitational pull of other celestial bodies in the area. This power of attraction impacts us more the closer we are to other celestial bodies. Additionally, he made an effort to confirm that the Earth orbited the Sun in an ellipse. All of this contributed greatly to the advancement of science and space observation.