Defence satellites are essentially telescopes pointed towards Earth and require identical technology and hardware to those used in their astronomical counterparts. Global Positioning System (GPS) satellites rely on astronomical objects, such as quasars and distant galaxies, to determine accurate positions.
Similarly, you may ask, how does the astronomy work?
Astronomers study planets and the sun in our own solar system, as well as other stars, solar systems, galaxies, and the whole universe. Astronomers try to understand how the universe works. Astronomy is a science where astronomers observe physics at work throughout the universe!
What is the concept of astronomy?
Definition of astronomy: Astronomy is the study of the sun, moon, stars, planets, comets, gas, galaxies, gas, dust and other non-Earthly bodies and phenomena. In curriculum for K-4 students, NASA defines astronomy as simple "the study of stars, planets and space."
What do modern day astronomers do?
In general, astronomers seek an understanding of how the Universe works; from the planets in our own Solar System, to the evolution of stars and nebulae, to whole systems of galaxies, to the properties and fate of the Universe as a whole.