amol48 said:
yup they exist i think... There are lot of galaxies in the Universe and so the planets. There must be living community yaar !!!
Regrding Time travel... Einstein says that time travel is possible one condition:
1. You should be able to travel more than the speed of light.
But it's not like the one shown in Hollywood Movies, e.g. Back to the future.
In this case,traveling faster than light, one will go to past.But its impossible to travel even at the speed of light, since it'll need Infinite power.
Again using 'traversable' wormhole one can go to past.
Again as you may know gravity slows time. So if one person stays in high gravitational mass, say near event horizon of Black hole ,then other events in universe would move very fast for him like a fast fwd film. His one year stay in event horizon of black hole will equvalent to 1000s yr in earth.Thus he can travel to future.
Approaching the light speed also slows time. So if one person travels at near light speed to a far body,like pluto, then travels back to earth , time passed for whim will be less than time passed for earth observer.Best example is twin paradox.
But time travel looks impossible, cause if it was achived in some time in future we would've seen future travelers ....