write an essay on galaxy in about 150 words.
Answers
Answer:
A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word galaxy is derived from the Greek galaxias, literally "milky", a reference to the Milky Way
The first galaxies were identified in the 17th Century by the French astronomer Charles Messier, although at the time he did not know what they were. The universe has many galaxies. Galaxies are composed of stars, dust and dark matter, all held together by gravity. They differ from each other in shape, size, colour and composition. There are 3 types of galaxies that we find in the universe elliptical galaxies , spiral galaxies and irregular galaxies.
The solar system where our earth exists is in the Milky way galaxy is spiral galaxy. milky way galaxy includes the sun, earth, and our solar system. It contains dust particles, huge clouds, and gasses that lie throughout it and depths of interstellar
space.