Question

How many elliptical galaxies are there in the universe?

Answer 1

Hint: You may be familiar with this class of galaxies. You could give certain descriptions about elliptical galaxies. We asked about the entire universe, the major part of which is yet undiscovered. So, think of the possible ways in which you could make a possible assumption with the known facts.

Complete answer:
In the question, we are asked to find the number of elliptical galaxies that are present in our universe.
Elliptical galaxies are those galaxies that are known to have an approximate ellipsoidal shape.
Back to the question, we know that a major part of the universe is yet undiscovered. All we know is that the universe is vast beyond our imagination. It is quite obviously impossible to answer the given question at the present when the observable universe is too small when compared to yet unexplored universe.
But, we could try to make a wild assumption from the percentage of elliptical galaxies that are present in the observable universe. It is found that 20% of the known galaxies are elliptical. Now that we know the percentage, we need to know the total number of galaxies in the universe. But that is also unknown.
Therefore, we cannot make a conclusion on the number of elliptical galaxies in our universe.

Note:
Elliptical galaxies fall in the three main classes of galaxies that were described by Edwin Hubble. They commonly consist of older low mass stars that show minimal star formation activity and have sparse interstellar medium. One could find this class of galaxy close to the centers of galaxy clusters.