Other ways are just far to dangerous.BUT probes and other ways of research are sent differently.
because they could do that Because it was the only way to get anywhere interesting.
There was only one way for convicts to travel to Australia, and that was by way of wooden ships.
Yes! As far as space travel goes, Shuttles are basically our only way, at the moment, to travel far distances in the endless reaches of space. Apart from rockets which take take us from earth into space, and carry the heavy loads, shuttles are what are used mainly.
There are some projects in development that has to do with a different way to travel through space but current day technology has yet to developed one that any of the space agencies would rather replace with the good ol' rocket .
The only way you could do that is to travel into space.
You can travel one way on nearly every form of public transportation. That includes trains, planes, buses, cabs, etc. For shorter distances, like between floors, there are escalators, and they literally travel in only one direction.
In DC circuits the current travels only in one direction.
two way
by converting one into light particles.
If light rays did not travel through space there would be no way for them to reach Earth.
the only way is to buy a new one
It means that you can only travel in one direction on a road.