How fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri?

How fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri (a distance of 1.3 pc) and back in less than an average human lifetime (80 years, say)?How fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri?When you start traveling that fast something interesting happens, that something is called time dilation and the faster you travel time for you slows down and the faster you go the less you have to worry about the human lifespan since you would age very slowly. Also it can eliminate the need to carry a lot of supplies which would add excess weight to the spacecraft.

Note: For the speed required would still have to be extremely fast think 99.99%+ the speed of light so the ship wouldn't need to really carry any supplies.How fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri?
are you looking for the fastest possible trip? or the slowest? its an 8 year round trip at the speed of light, which does NOT account for acceleration and deceleration.... the "longest" trip of the whole 80 years would be (you guessed it) 1/10th the speed of light, again, not counting acceleration and deceleration, from birth to death of an 80 year life spanHow fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri?If to fly on light beam (this very stupid) it take just about 80 years.If there is engine and desire...The seing light first was been the rentgen ray,so you want to see star ever in the travel? Moving ship with accelaration is in the paralel systems as well.How fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri?
40 years to travel 4.2 light-years makes just over 10% the speed of light.How fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri?Well, it would have to cover over 8 light years (a little more than four each way) in that 80 year time frame.



1/10 C would be a pretty rough estimate.



Which equates to over 18,000 miles per SECONDHow fast would a spacecraft have to travel in order to complete the trip from Earth to Alpha Centauri?
Pretty fast, when you go let me know, I want to go with you.

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