The scientific study of all the matter -- energy found in the universe, dealing with their origin, composition, distribution and movements is called astronomy. It is one of the oldest branches of science in the world. In the old times, astronomical studies included consideration of only the sun, the moon and some of the stars and their constellations illustrated to the naked eyes. This was before the invention and development of telescope.
Telescope is one of the most crucial inventions in the field of astronomy. It was invented by Galileo Galilei, a Greek astronomer in the year, 1611. It was additional developed by many more scientists and astronomers along with Sir Isaac Newton which made the instrument more great can capable. Due to careful observations and study of all the celestial objects nearby us, some major discoveries were, and are still being made about our origin, existence and also our future.
Telescope
Broadly, astronomy is divided into two categories - optical, where it deals with direct photographs of the space and its components; and non-optical, the field dealing with things like black holes and neuron stars, the visual photographs of which are not yet possible to be taken and are understood by their radioactive activities and energy signals.
Now, there are varied branches of astronomy based on the main object it is dealing with. Planetary astronomy (planets), Solar Astronomy (sun), Stellar Astronomy (star), Galactic Astronomy (Milky Way), Extragalactic Astronomy (other galaxies in the universe) and Cosmology (structure of universe) are all parts of the broad field of Astronomy. Some of the consummate contributors to the field of astronomy contain names like Galileo, Newton, Albert Einstein, Edwin Hubble and Stephen Hawking.
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