NASA today, mentioned about going to the moon (heard it before). Then i read that they want to make a 125tonne heavy lifting launcher...

 

Why don't they just make a small 50tonne lifter (the shuttle does 20 i think), and have it dock at the ISS, then send up the next 50tonnes and assemble the whole thing in space?

 

At least it will maintained by the existing ISS crew. Include some additional thrusters to keep the whole thing 'up there'.

 

Maybe no need for the 50tonne part to even be connected to the ISS - just have it floating around close by (tethered), so the ISS crew can go over and look after it.

 

If a 125tonne launch fails, then all is lost.

125tonnes seems a hell of lot of weight and power to risk in one shot.

 

I thought the whole idea of a ISS was to have a platform manned 'BASE' in orbit - about time we used it for a platform.

the saturn V could lift 125 tonnes quite nicely. i'm assuming that one built today could lift as much and be smaller and lighter.

I wasn't aware of anything that could do 125tonnes, so i did a quick google.

 

Which model of Saturn V are you reffering to? The biggest i found was Model:

 

Saturn V. Family: Saturn V. Country: USA. Three-stage lunar landing booster.

LEO Payload: 118,000 kg. to: 185 km Orbit. at: 28.0 degrees. Payload: 47,000 kg. to a: Translunar trajectory

 

Thats a LEO only, admittedly it's 118tonnes. But to get 'out there', it's only 47tonnes.

the energia rocket russia built could do a bit more.

 

the shuttle does 60

 

launching two rockets that can do 50 is probably more expensive, everything would need to be built in space as well (very expensive and difficult). The modular construction would probably hinder structural integrity as well. and finally if you want to launch a 125 tonne space craft you better build a 125 tonne rocket.

Don't forget, there's a difference between metric tonnes and imperial tons.

my source on the saturn V said it could lift a payload of 125,000 kg into LEO.