ANSWER:

At 85-165

Claudius Ptomely developed a model to predict the movements of the sun, moon,planets and stars based on the Earth-centred model of the universe.

At 1048-1131

Omar Khayyam calculated accurately the number of days in a year.

At 1473-1543

Nicolaus Copernicus developed the Sun-centred model of the solar system where the planets move around the sun in circular orbits.

At 1564-1642

Galileo Galilei designed and made his own telescopes.

He observed sunspots on the sun, craters and mountains on the Moon, four of Jupiter's moons,Saturn's rings, and the phases of Venus, among others.

At 1571-1630

Johannes Kepler developed three laws regarding the orbits of planets. One of them states that the planets'

orbits around the sun are oval and not circular.

EXPLANATION:

Many Scientists have explored the solar system and stars over the years. althought they could not reach these faraway places,they could explore them with the help of science and mathematics, and tools such as telescope.

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