Science and Technology : New Solar System Found With 3+ Planets

With our current equipment most of the extra-solar planets that have and are capable of being discovered will be gas giants rather than earth-sized. Of course that is not to say that a system which possesses such gas giants would also contain earth-like bodies. All extra-solar systems so far discovered are actually within our own galaxy and this new system is right next door on the cosmic scale, but we can assume fairly confidently that they will occur in other galaxies as well. In order for a planet to develop life it would need to lie at a distance away from its star such that water would be in a liquid state, it would also need to have an atmosphere, and this atmosphere would need to contain a gas such as ozone to shield out harmful ultra-violet radiation. It would also need to have a liquid core so that a sufficiently strong magnetic field was generated to deflect cosmic radiation. At first it would seem that a combination of all these factors is a very unlikely thing and indeed it is. But because of the vast scale of the universe statistically there will be millions of such planets out there - so the chances of other life are extremely high...
Just on Hyperkill's point re people travelling without spacecraft - that is of course only one explanation for those cave maps - they could also have been told this information by visitors from one of those other life-bearing planets.
 
While watching this video,I couldn't help but wonder what if any life was on any of those planets,and if so,how would they look? What if they were humans just like us face with the same issues of race,crimes,etc. We would have to rethink a great many things. We all know their is other life out there,it's just a matter of time now.
 

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