Have you ever wondered about life outside Earth? If there are other beings like us roaming in some far away rock? Good news is that you are not alone in thinking so. Many intelligent minds have been asking these questions for many many years! Before we take a look outside let us take look at our very own ‘Blue Rock’ – The Earth.
In our solar system there are 8 major planets; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Earth is the third planet from the Sun. For life to exist it’s important how far you are from the Sun (host star). To understand this better imagine a cold winter evening. We sit near the fire place or a heater to warm ourselves. If we sit too close, we could get ourselves burnt and if we sit too far, we will feel cold. So we have to find the right balance between the both. Same goes for life. If we are too close to the Sun we will burn up and if we are too far, we will freeze. The safe zone between these two zones is scientifically called *The Goldilock’s Zone.*
The other way to look at this zone is to check if water is liquid in that zone. This works because if it’s too hot, water gets evaporated and if it’s too cold, water will freeze.
Now all we have to do is to look up into the sky using our telescopes, and look for planets which are in the Goldilock’s Zone. As of 2019 we have found lakhs of planets outside our solar system in these Goldilock’s Zones, around different host stars. So does this mean that there is intelligent life outside of Earth? To answer this we need to question how the earth came to be. ( to be continued)