Sunday 27 May 2018

Are we alone?

Are we alone? Hm... I think the answer is most probably no. First lets see why we are here?
We are here in our home planet Earth which has everything in perfect amount to support life. Earth has the perfect amount of water to support life and have seasons. Earth has perfect amount of oxygen needed to support life, if there was more oxygen we couldn't control fire, if it was less we would die. Earth has perfect amount of carbon dioxide to keep the Earth warm or else I would be typing this post from a house full of ice because if Earth gets cold enough Ice Age will come. And many more such elements present in perfect amount supports life. How Earth has these elements in such precise amount? By luck that's all what I can say. Can there be another planet-star system like our solar system which contains a planet like Earth? Maybe.

Our Universe is large, extremely large. We usually say that universe is infinitely large. When Hubble focused in very tiny potion of sky(comparable to size of finger-nail), it took a famous photo of lots of galaxies in it.
Hubble Deep-Field
This photo contains almost 10,000 galaxies in it. Our own milky-way galaxy homes almost 300 billion stars. So you can think of the total no. of stars in this universe. In this infinitely large universe there can be star contain a planet at the perfect distance with all the elements in same amount as that of Earth which can support, or supports life.
If we are not alone, then why we don't know about those intelligent life species? The reason lies in the extremely large galactic distances. The farthest radio signal sent by humans have reached about 200 light years of distance, Wow!!! No, nothing so special. In our universe 200 light years is nothing where the diameter of our Milky-way galaxy is about 100,000 light years which is itself one of the billions of galaxies in our universe. There is a picture depicting how small is 200 light years.
No it is not the black box, it is the blue dot in the zoomed portion. Click on the image and see in full resolution. Let's think that there is an intelligent life species somewhere in the opposite end our galaxy. The signal we will send today will reach there after 100,000 years. In 100k years the intelligent life species may be no more there(due to catastrophe they die), let's think they will be there and listening for some signal and they receive it. In reply they will send a signal that will reach us after more 100,000 years. Because of this huge galactic distances till now we couldn't find them. But someday we will surely find other intelligent life species in our universe.

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