An earth-like planet is 500 light years away why is this an obstacle for a manned space mission?

a. there are no people willing to go on this type of mission

b. the cost to conduct this mission is to low

c. the correct technology cannot support this mission

d. there are too many spacecraft in the universe that would interfere where is the mission.

i am on a !

C. the correct Technology cannot support this mission  

Explanation:

There is not enough technology to make it possible to plan a mission safely for this distance. What can be done to study this planet is to visualize it with super powerful telescopes and to use simulations to analyze and identify the dynamics of the axis of rotation of the planet. These dynamics determine how much a planet tilts on its axis and how that angle of inclination evolves over time.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.