Oh, so we think putting arms in space is a good idea now? there is a treaty against that, because if we accept that, anyone who is able to get objects into space can do some of the following:
- Park nukes in space -> no launch, you just drop them on your enemy
- Tungsten rods -> put a couple of tungsten rods into a launch satellite and have them rain down from space on your enemy
At this point it's just a concept. There's nothing being actively developed.
Putting nukes or tungsten rods in space wouldn't accomplish much. You can't just "drop" an object from orbit. Instead you need to conduct a burn to de-orbit and head toward the target. So it doesn't save much time compared to hitting the target directly with a missile launched from Earth. Launch satellites themselves would be vulnerable to anti-satellite defenses so they would be shot down early in any major conflict. And nuclear weapons can't be left unattended indefinitely; they require maintenance at least every few years in order to operate reliably.
Wikipedia's definitions are what I understand about it.
https://en.wikipedia.org/wiki/Missile_defense#Mid-course_pha...
With boost phase you have around 180 seconds to see it and to react to it.