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The nearest world that might host life is just 4.2 light-years away — but at the speed of the fastest spacecraft humanity has ever flown, the trip would take 75,000 years ...

Just over four light-years away, the Alpha Centauri system holds the closest worlds beyond our own that might support life.
IFLScience

If The Visible Universe Is 13.7 Billion Years Old, How Is It 93 Billion Light-Years Across?

Alfredo has a PhD in Astrophysics and a Master's in Quantum Fields and Fundamental Forces from Imperial College London.View full profile Alfredo has a PhD in Astrophysics and a Master's in Quantum ...