Earth's neighboring galaxy, the andromeda galaxy, is a distance of 2.54×10^7 light-years from earth. if the lifetime of a human is taken to be 70.0 years, a spaceship would need to achieve some minimum speed to deliver a living human being to this galaxy. how close to the speed of light would this minimum speed be?

0.9999986*c

Explanation:

The ship would travel 2.54*10^7 light years, which means that at a speed close to the speed of light the trip would take 2.54*10^7 years from the point of view of an observer on Earth. However from the point of view of a passenger of that ship it will take only 70 years if the speed is close enough to the speed of light.

Where

Δt is the travel time as seen by a passenger

Δt' is the travel time as seen by someone on Earth

v is the speed of the ship

c is the speed of light in vacuum

We can replace the fraction v/c with x

It would need to travel at 0.9999986*c

Ibelieve the statement is true.  the imaginary line which passes through the north and south poles, upon which the earth rotates once every 24 hours is called the prime meridian. it   runs through greenwich, england and is at 0° longitude.  hope this answers the question. have a nice day.