Question

space travel
for years, science - fiction filmmakers and novelists have been creating alternative, habitable planets in parallel universes. many of their fans ask: do these planets really exist? if they do, can humans reach these planets?
the reality of planets beyond our solar system is not a piece of fiction. outer space is filled with millions of galaxies and, in each galaxy, there are thousands of stars and planets. whether or not humans can reach these distant planets is debatable. in order to debate this, one should understand why this has created a debate, one should understand the design of our universes many galaxies.
to begin with, the universe is immeasurably vast and expanding. in order to cover vast distances, one needs speed. on the other hand, the distance in space is measured by light years. the fastest traveling entity known to humans is light. it travels at the speed of 186,000 miles per second! the distance traveled by light in a year is called one light year. in other words, in order to travel a distance of one light year, one should travel at 186,000 miles per second - if thats ever possible - for a year! for this reason, visiting a neighboring
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which detail best supports the idea that someday man might travel to another galaxy?
a. space travel to distant planets may not be viable now, but we have no reason to believe that it will remain so for long.
b. the nearest galaxy is approximately 70 years away from earth!
c. not to leave planet earth would be like castaways on a desert island not trying to escape.
d. moving from one place to another without the use of physical space or a vehicle is called teleporting.

Explanation:

• Option A suggests that space travel to distant planets (which could include those in other galaxies) may become viable in the future. This supports the idea of future travel to another galaxy.
• Option B just gives the distance of the nearest galaxy but doesn't imply that travel will be possible.
• Option C is a metaphor about not leaving Earth and has no direct relation to traveling to another galaxy.
• Option D defines teleporting but doesn't support the idea of actual travel to another galaxy.

Answer:

A. Space travel to distant planets may not be viable now, but we have no reason to believe that it will remain so for long.