General objective of this lecture is to present on Space – The Final Frontier. Here briefly present on Early astronomers. Astronomer – Astronomers use the principles of physics and mathematics to learn about the fundamental nature of the universe, including the sun, moon, planets, stars etc. Nicholas Copernicus (1473 – 1543) the first astronomer to teach that the sun was the center of the solar system. Galileo Galilei – built the first telescope in 1609 and proved Copernicus correct. This lecture also briefly present on Milky way Galaxy and Solar System.