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[Gizmodo]How NASA’s Nuclear Rockets Will Take Us Way Beyond Mars - Page 12

post #111 of 124
Quote:
Originally Posted by Kirmie View Post

Sure we can. We have to cool the massive heat that the sun puts on everything as well as create heat when the sun isn't heating things. We are cooling or heating things in space 24/7. A vacuum doesn't magically stop the transfer of heat. Heat is energy, not just temperature.

Staying Cool on the ISS

Edit: As for the amount of water, check out nuclear submarines. I've no data on that off the top of my head but I highly doubt they use the salt water to spin the turbines because of how corrosive it is.

Yeah but that isn't a nuclear reactor steam plant capable of generating enough power to feed Ion thrusters in combination with dissipating the heat the sun would put on a ship.

Submarines and ships don't need a lot of power to turn their props...so they produce a faction of the power a land based reactor does. They are small self contained systems that use heat exchangers to heat water in another system and with efficient enough radiators might be able to operate in space with rich enough fuel...but it would be a really tiny ion thruster on the ship and the wet ships use the sea to cool the the coolant.

Solar power would probably give more performance per mass in space. The Enterprise had to have eight reactors...and no it never sucked in sea water directly...it all went though a desalination process first...the coolant was pressurized liquid of some kind...water based I am sure, but that never went anywhere and stayed in a container around the reactor. Its heat was just sucked out to the ocean. I got to spend some time on that ship and a few navy guys told some of the stuff that you couldn't just pick up a popular mechanics magazine and read about. Not really much was classified about its propulsion by that time.

Though...the thing I think we both are missing is that in space you don't need constant acceleration. once you get moving you will stay moving. So how about a large nuclear reactor that could get the shipping moving good and just store the heat and let it dissipate after it is shutdown...but hopefully before the ship needs to slow down.
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post #112 of 124
Quote:
Originally Posted by StormX2 View Post

Thanks thumb.gif


Space Elevator still sounds hard to believe, the only one that seems possible is tow cable design, with a Carbon nanotube super cable, with a "climber" pod of sorts co carry personnel.

Problem is, the more weight you add to this climber, the tougher that cable will have to be.

At least for now its just not happening, I mean, what are you gonna do, make 20K + Miles of Cable and drop it down on earth from space?

the counterweight would have to be well beyond the range of geosynchronous orbit, which is already 22K Miles up!

There are ways, but obviously we aren't there yet. Improved solar power engines could allow for could eventually allow for a constant thrust at the end of the cable to lower the distance necessary for the cable to extend. We could also use small boosters on the payload to lower the effective weight of the load placed on the cable. Those would only have to work for a portion of the journey as gravity would have less effect as the item ascends. You could also start from a high elevation around the equatorial bulge (Everest is the highest peak above sea level but not the farthest from Earth's center). The elevation could be a man made structure designed from cheaper material. All sorts of fun and interesting stuff will come about for this.
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post #113 of 124
super duper solar panels is needed once they get up there free energy from the sun, if they could harness that as some kind of drive would be great biggrin.gif

Damn just read your post above - great minds think alike thumb.gif
post #114 of 124
I wonder if in that Movie Sunshine, if the radiation Heat shield would actually work or not.
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post #115 of 124
Quote:
Originally Posted by Bennny View Post

I feel sad that I won't get to see the most amazing things. It's just a matter of time.

Don't be so sure. We've done amazing things in a very small amount of time.
We went from banging 2 rocks together as cavemen to launching orbital satellites into space in only 2000 years! Plus, we're always learning better and more efficient ways to figure these types of things out.

Trust me, it'll happen sooner than you think.
post #116 of 124
Quote:
Originally Posted by frickfrock99 View Post

Don't be so sure. We've done amazing things in a very small amount of time.
We went from banging 2 rocks together as cavemen to launching orbital satellites into space in only 2000 years! Plus, we're always learning better and more efficient ways to figure these types of things out.

Trust me, it'll happen sooner than you think.

yah you never know really, an overnight discovery could change the game in a heartbeat.
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post #117 of 124
Look at the Victorian times - the biggest leap in history thumb.gif
post #118 of 124
I think it's been more like 10,000 years since we beat rocks together, but I feel ya

But we are planning to launch the first Orion test module in 2014, and apparently from the source article start making more Plutonium again in 2017 for these awesome rockets.

Hopefully media and the populace will take interest in Nasa by then, so we can stop throwing money at DoD.
Don't give it all to the warlords, give it to the nerds once in a while!
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post #119 of 124
Quote:
Originally Posted by frickfrock99 View Post

Don't be so sure. We've done amazing things in a very small amount of time.
We went from banging 2 rocks together as cavemen to launching orbital satellites into space in only 2000 years! Plus, we're always learning better and more efficient ways to figure these types of things out.

Trust me, it'll happen sooner than you think.

Me thinks your timeline is of by several thousand years...

Hell 2000+ years ago they were calculating the position of planets and the moon down to the hour.
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post #120 of 124
Quote:
Originally Posted by -Apocalypse- View Post

Nuclear weapons are banned in space. Not nuclear power.

It was a joke.
Edited by Bennny - 4/5/13 at 3:28pm
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