I'm currently in a nation roleplay and some nations are now looking towards the stars to expand their reach and power. We are all using modern technology mixed in with near future technology (30 to 40 years in the future) and was wondering how feasible it would be to create some sort of defensive dome (not like an actual solid dome) around the earth that could block/destroy any rockets that try and reach for space.

I want to create the dome because we are still waiting to establish a new DM for the roleplay and one guy just went ahead and said he doesn't care, he's going to space whether we like it or not, so I'm kind of annoyed and just want see what I can do to stop him. I still want to stay within the realm of possibility however. 

Outside of the realm of roleplay, I just thought it was an interesting question that could also be used for people that would want to apply this to the real world, so you can just use real nations as the basis of whether or not it's possible.

In case it is needed, my nation is not the best in anything (although I do have a thriving agriculture sector), but my technology, manufacturing, and education is better than his according to stats. My economy is also more powerful.