Question

Galaxies are categorized on the basis of their shape which includes: Choose the correct option.
A- Spiral shape galaxies
B- Elliptical galaxies
C- Irregular galaxies
D- All of the above.

Answer 1

Hint: A galaxy is defined as a humongous collection of gas, dust and other stars and their solar systems all bind together by mutual gravitational forces. Our earth is also a part of a galaxy called the Milky way, not only the earth, but also, other planets and the sun are a part of the Milky Way.

Complete step by step answer:
A galaxy is defined as a humongous collection of gas, dust and other stars and their solar systems all bind together by mutual gravitational forces. Our earth is also a part of a galaxy called the Milky way, not only the earth, but also, other planets and the sun are a part of the Milky Way.There are many galaxies including the Milky way. The Hubble space telescope is used to find them and many new. Now coming to the shape of the galaxies, the shape of our galaxy, the Milky way is spiral. Some galaxies which have been spotted through the use of the Hubble telescope are spiral-shaped just. Other galaxies found out to be smooth and oval-shaped. They are termed as elliptical galaxies. There are other galaxies which when observed were neither spirals nor ovals. They have irregular shapes and look like blobs. So, we can conclude in short that the shape of the galaxy can be spiral, can be elliptical and can be irregular.

So, the correct option is (D)

Note:Galaxies are so big and spread out at the ends that even though galaxies bump into each other.The field of astronomy offers excitement and unknown answers to all our questions. Some galaxies have black holes in them.