Why astrophysics is a mysterious subject?

Hello everyone! Welcome back to my second discussion.

In today's Physics class, we had a discussion, whether we have planets outside the solar system. 

I thought, we are having only 8 planets in our system, but I learned something about is EXOPLANETS.

What are exoplanets?

Planets that orbit around the stars and the planets, that are found outside the solar system are called exoplanets. 

It's an interesting, yet an mysterious about the planets.

How do they find about it?

There is this mission called Kepler mission, where they zoom a particular star through kepler telescope and they keep an eye on a star. While doing it, they can see the shadows of the planet, when it crosses the star.

This is the image, where the yellow planets were found by kepler mission. 

What are the objectives of finding exoplanets?

One of the primary objectives of the Kepler mission was to find out how many stars hosted planets and especially to estimate the frequency of earthlike planets. Although Kepler looked at only a very tiny fraction of the stars in the Galaxy, the sample size was large enough to draw some interesting conclusions. While the observations apply only to the stars observed by Kepler, those stars are reasonably representative, and so astronomers can extrapolate to the entire Galaxy.

Though science is crazy, filled with mysteries, mysterious concepts but, an interesting facts to learn about.

We think that, there are only 8 planets in the universe. How many people knew that there is something called exoplanets?

I learned these facts, which were taught by Nirmal sir and I wanted to share it here.

And Thus, ASTROPHYSICS is exploring the universe, where it will be mysterious and takes a long time to find an answer, but the answers will sometimes makes us shiver and curious about it.