And 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 current technology cannot support this mission.

(d) there are too many space crafts in the universe that would interfere with the mission.

Which statements describe the relationship of earth and its moon? check all that apply.the moon orbits earth following a nearly circular path.the gravitational pull of earth on the moon is parallel to the velocity of the moon.the moon orbits earth in 1 earth day.the same face of the moon always points toward earth.the moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from earth