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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.
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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 ...
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The observable universe stretches about 93 billion light-years across

The boundary of everything humans can observe stretches roughly 92 billion light-years across, a figure shaped by 13.8 billion years of cosmic expansion since the Big Bang. That number, derived from ...