A proposed space elevator would consist of a cable stretching from the earth's surface to a satellite, orbiting far in space, th
at would keep the cable taut. A motorized climber could slowly carry rockets to the top, where they could be launched away from the earth using much less energy. What would be the escape speed for a craft launched from a space elevator at a height of 56,000 km?
I am pretty sure that if a star has no measurable parallax it means that it is placed on unreachable distance so that you need a special equipment in order to get closer and measure <span> parallax. The point is that it is placed too deep in space and you are not able to measure it with basic equip. Hope that helps.