Welcome to the grant finale of this mini series and i hope you enjoyed it as much as i did. Probably, if my eyes catch a weird and amazing exoplanet to be found, i will make a post ASAP but for now let's close it with my fifth post and as a theme for the final episode we gonna have planets that changed our way of thinking and gave us hopes as well as motivation. 

Basically, i want to finish it with planets that gave a fresh start to scientists!

 HD 209458b (Osiris)

Osiris is an extrasolar planet belonging in constellation Pegasus,is 150 light-years away and discovered back in 1999. This planet discovered by the transit method

Transit: the phenomenon in which at least one celestial body moves across the face of another one's and hiding a part of it

and scientists have found both oxygen and carbon in the atmosphere. The name Osiris that it didn't occurred cause of me was given to this planet because the above elements ( oxygen and carbon) are evaporating so quickly  that is similar to Osiris story as his brother cut him into pieces.

Is that planet so important? 

Damn right it is and i will tell you why right away! First of all as i mentioned above it was the first extrasolar transiting planet ever to be found. Also, Because of the oxygen it was one of the firsts extrasolar planets known to have an atmosphere and an atmosphere with carbon and oxygen. Moreover, a planet that is evaporating so quickly and one of the 2 first planets that observed directly Spectroscopically

Spectroscopy: the study of interaction between matter & electromagnetic radiation. Below is a video that explain its a bit further 

In therms of life chances are low as the planet is close to it's sun but worry not as the discovery of Osiris proved to so beneficial for the scientific community as their theories proved right in action, they discover things about our universe they had no idea about their existence and also came a bit closer to understand the universe and our Earth. Finally completing so many achievements by only one planet you can imagine the joy and motivation of those scientists!

KEPLER -22b (Half-life)

Kepler-22b is another extrasolar planet that discovered in December 2011 by the Kepler Telescope, belongs to the constellation of Cygnus and is 600 light-years away from Earth. Kepler-22b is about 2.4 times bigger in diameter than Earth and a star like our sun but a bit smaller and colder with a temperature of 22 Celsius degrees.   

So why the big fuss?

As we know the Kepler telescope looks for other planets in the deep space and as an ultimate goal it has to find planets that are habitable and we can go and live to or find aliens. To understand further the progress of Kepler just think that in 2011 they had 54 planets as potentially habitable candidates while by 2017 it had found more than 4000. 

Kepler -22b or Half life ( not the game) as i call it is so important as it was the first exoplanet found in the habitable zone of it's star meaning that all the scientists completely loose their minds and were so happy they found something that may contain life and it's similar to our Earth. The similar to our Earth part was the most important cause it gave them motivation to work harder and proved that all their work wasn't for nothing.  

In case you haven't read my previous posts and don't get what exactly the habitable zone is let me explain it with simple and plain words. A key difference in the habitable zone with in general the universe is that the water the planets may contain it's not extremely hot or frozen and it's liquid, so when we are talking about liquid water in form of seas and oceans there are higher chances of life to be existed.

Now let's get back to our Half life and understand the reason i gave such a wonderful name. The main reason is that nobody knows exactly if that planet is really habitable and life exists. Surely there are many signs that lead to ''good news'' but some people thing that there is not life there and that Half-Life may be more likely, like Neptune.

I hope you enjoyed this journey as i did too and learn a couple of things about our marvelous universies. I have another series completely different i am gonna lunch next week so don't worry :P. Furthermore, in case you wanna read my oldest parts of the series you can click Here1 Here2 Here3 Here4

Images and gifs 1 2 3 4 5 

Sources
https://www.nasa.gov/vision/universe/newworlds/Osiris_leaks.html
https://en.wikipedia.org/wiki/HD_209458_b
https://www.britannica.com/topic/HD-209458b
http://www.thelivingmoon.com/43ancients/02files/Extra_Solar_Planet_Osiris_Images_01.html
https://www.nasa.gov/content/kepler-22b-closer-to-finding-an-earth