Poll

Should NASA ditch asteroids and Mars to help lead the strong international interest for Lunar missions?

Stay with the current Mars plan
18 (17.5%)
Go to Mars but on a new plan
17 (16.5%)
Go to the Moon solo
21 (20.4%)
Join in an international Moon quest
47 (45.6%)

Total Members Voted: 103

Voting closed: 02/12/2016 08:01 PM


Author Topic: Should NASA refocus on returning to the Moon?  (Read 49992 times)

Offline clongton

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Re: Should NASA refocus on returning to the Moon?
« Reply #360 on: 03/12/2017 11:11 AM »
Refits of in-space vessels should be done at EML-1 (or maybe EML-2).  Easily accessed from Earth, Moon, interplanetary, minimal energy to maintain position, top of gravity well for departure (w/ Oberth burn advantages).  In-spac ship assembly could also be done here -- avoids ships having to be structurally strong enough (and small enough) to depart Lunar surface as well as eliminating the delta-v penalty discussed above.

Yes, minor refits and normal maintenance could be done at EML-1/2 but mind you that would require a large facility orbiting the Lagrange point. That's a big deal. Why have a surface base and a big orbiting shipyard? Being structurally strong enough to to depart the lunar surface is a good thing. Even the Apollo LM's did that so that's not a big deal. The only reason we do on-orbit assembly is because we can't lift enough mass in a single lift to build it on the ground. That would not be the case in lunar gravity. What could we put in LEO if our engines were 6 times as powerful as they are now and only had to go 43% the altitude (98 km vs 250 km) and only 22% the velocity (5,800 k/h vs 27,360 k/h) to orbit? That's the lift advantage the lunar surface offers. Think big AncientU, think big.
« Last Edit: 03/12/2017 11:23 AM by clongton »
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Offline TrevorMonty

Re: Should NASA refocus on returning to the Moon?
« Reply #361 on: 03/12/2017 01:02 PM »
Refits of in-space vessels should be done at EML-1 (or maybe EML-2).  Easily accessed from Earth, Moon, interplanetary, minimal energy to maintain position, top of gravity well for departure (w/ Oberth burn advantages).  In-spac ship assembly could also be done here -- avoids ships having to be structurally strong enough (and small enough) to depart Lunar surface as well as eliminating the delta-v penalty discussed above.

Yes, minor refits and normal maintenance could be done at EML-1/2 but mind you that would require a large facility orbiting the Lagrange point. That's a big deal. Why have a surface base and a big orbiting shipyard? Being structurally strong enough to to depart the lunar surface is a good thing. Even the Apollo LM's did that so that's not a big deal. The only reason we do on-orbit assembly is because we can't lift enough mass in a single lift to build it on the ground. That would not be the case in lunar gravity. What could we put in LEO if our engines were 6 times as powerful as they are now and only had to go 43% the altitude (98 km vs 250 km) and only 22% the velocity (5,800 k/h vs 27,360 k/h) to orbit? That's the lift advantage the lunar surface offers. Think big AncientU, think big.
EML1 is better location for constructing large space assets. Not constrained by gavity,  LV and Lander requirements. Have moon or asteriods provide processed materials and simple but heavy parts with earth providing high tech parts.
« Last Edit: 03/12/2017 01:03 PM by TrevorMonty »

Offline quanthasaquality

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Re: Should NASA refocus on returning to the Moon?
« Reply #362 on: 03/12/2017 01:18 PM »
What would we do on the moon? Think L-O-N-G  T-E-R-M.

I would suggest that the eventual goal would be a functioning interplanetary exploration center and shipyard, where interplanetary spacecraft are built, launched, recovered, refurbished, restocked, re-crewed and launched again. Absence of the deep earth gravity well will eventually enable far more efficient spacecraft designs that what we can build on earth, work real hard to put tiny pieces of it into LEO and then assemble in zero-g. Fighting only only 1/6 g it shouldn't be much problem to outfit engines strong enough to lift the vehicles into LLO before mission departure.

This is, of course, a long term vision, but one that I believe, if you think long term, is practical.

Well, since you've raised the issue.

I think lunar material should be mined, and artillery 'shells' should be manufactured on the moon. A giant cannon will fire the shell on a suborbital trajectory. Drones in low lunar orbit, will intercept the 'shells', and accelerate it up to low lunar orbit velocity. I don't know if the cannon will be a railgun, light gas gun, or liquid propellant combustion. battleship cannons would get ~800 m/s. AA autocannons get around ~1,100 m/s. Tank sabot rounds can get around ~1,500 m/s. The Paris Gun got ~1,600 m/s. HARP once got over ~2,000 m/s. I guess there are tradeoffs on barrel longevity, payload size, etc. Low Lunar orbit is ~1,800 m/s. I will assume ~1,100 m/s is the low end velocity with reasonable barrel life. Hydrogen will be brought from earth, to produce silane and oxygen rocket fuel.

shipyards should be built in low lunar orbit. I can see ship size of tens of thousands of tons... I anticipate the desired delta v to be enough to do a gravity assist swing by of Venus to reach Jupiter, Saturn, or beyond. Yes, that is going to need lots of silane. 2000? 3000? m/s from LLO to Venus gravity assist flyby. I imagine it will be a nuclear power station with food grow room. I imagine it will be like the Nimitz class aircraft carriers.

All that silicon dioxide rocket exhaust should be shot at the moon, lest it trash up lunar orbit.

Online AncientU

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Re: Should NASA refocus on returning to the Moon?
« Reply #363 on: 03/12/2017 03:53 PM »
Refits of in-space vessels should be done at EML-1 (or maybe EML-2).  Easily accessed from Earth, Moon, interplanetary, minimal energy to maintain position, top of gravity well for departure (w/ Oberth burn advantages).  In-spac ship assembly could also be done here -- avoids ships having to be structurally strong enough (and small enough) to depart Lunar surface as well as eliminating the delta-v penalty discussed above.

Yes, minor refits and normal maintenance could be done at EML-1/2 but mind you that would require a large facility orbiting the Lagrange point. That's a big deal. Why have a surface base and a big orbiting shipyard? Being structurally strong enough to to depart the lunar surface is a good thing. Even the Apollo LM's did that so that's not a big deal. The only reason we do on-orbit assembly is because we can't lift enough mass in a single lift to build it on the ground. That would not be the case in lunar gravity. What could we put in LEO if our engines were 6 times as powerful as they are now and only had to go 43% the altitude (98 km vs 250 km) and only 22% the velocity (5,800 k/h vs 27,360 k/h) to orbit? That's the lift advantage the lunar surface offers. Think big AncientU, think big.

Factories for spaceships on the Moon make sense, but assembling them at EML-1 will be necessary -- since my spaceships are thousands (then, after a bit of practice, millions) of tonnes and never 'land.'  Our biggest engines would be kept quite busy.

All have artificial gravity and are meant for long duration space travel -- Solar System first.
One day... starships, O'Neill cylinders.

Note: the 'large facility orbiting the Lagrange point' would be one of many construction shacks.
« Last Edit: 03/12/2017 03:58 PM by AncientU »
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Online AncientU

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Re: Should NASA refocus on returning to the Moon?
« Reply #364 on: 04/05/2017 03:19 PM »
Moon first is consensus of space agency leads:

Quote
COLORADO SPRINGS — With NASA’s long-term strategy for human missions to Mars in flux, heads of several space agencies said they supported initial missions to the moon as a key step before going to Mars.

During an April 4 panel session during the 33rd Space Symposium that featured representatives from 15 agencies, many expressed support for going to Mars only after building up experience at the moon first.

“We think that the moon is also a very important step. Mars is not the ultimate goal,” said Jan Woerner, director general of the European Space Agency. “The moon is an intermediate step to go to Mars, but the moon can also offer some special opportunities.”

Woerner, as he has done in recent years, promoted his vision for a “Moon Village,” a lunar facility that would include contributions from various countries and companies. “Moon Village is part of our overall strategy,” he said.

http://spacenews.com/space-agency-heads-see-the-moon-on-the-path-to-mars/
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Offline Star One

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Re: Should NASA refocus on returning to the Moon?
« Reply #365 on: 04/05/2017 03:34 PM »
Moon first is consensus of space agency leads:

Quote
COLORADO SPRINGS — With NASA’s long-term strategy for human missions to Mars in flux, heads of several space agencies said they supported initial missions to the moon as a key step before going to Mars.

During an April 4 panel session during the 33rd Space Symposium that featured representatives from 15 agencies, many expressed support for going to Mars only after building up experience at the moon first.

“We think that the moon is also a very important step. Mars is not the ultimate goal,” said Jan Woerner, director general of the European Space Agency. “The moon is an intermediate step to go to Mars, but the moon can also offer some special opportunities.”

Woerner, as he has done in recent years, promoted his vision for a “Moon Village,” a lunar facility that would include contributions from various countries and companies. “Moon Village is part of our overall strategy,” he said.

http://spacenews.com/space-agency-heads-see-the-moon-on-the-path-to-mars/

If only they'd come to this conclusion five years ago.

Offline redliox

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Re: Should NASA refocus on returning to the Moon?
« Reply #366 on: 04/05/2017 03:39 PM »
Moon first is consensus of space agency leads:

Quote
COLORADO SPRINGS — With NASA’s long-term strategy for human missions to Mars in flux, heads of several space agencies said they supported initial missions to the moon as a key step before going to Mars.

During an April 4 panel session during the 33rd Space Symposium that featured representatives from 15 agencies, many expressed support for going to Mars only after building up experience at the moon first.

“We think that the moon is also a very important step. Mars is not the ultimate goal,” said Jan Woerner, director general of the European Space Agency. “The moon is an intermediate step to go to Mars, but the moon can also offer some special opportunities.”

Woerner, as he has done in recent years, promoted his vision for a “Moon Village,” a lunar facility that would include contributions from various countries and companies. “Moon Village is part of our overall strategy,” he said.

http://spacenews.com/space-agency-heads-see-the-moon-on-the-path-to-mars/

Surprisingly the head of the Italian space agency disagreed and suggested going straight for Mars.  Zubrin would be proud.
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Offline TrevorMonty

Re: Should NASA refocus on returning to the Moon?
« Reply #367 on: 06/17/2017 09:31 AM »
A couple of podcast with moon focus

I don't think NASA will be landing humans or building lunar bases anytime soon, at least until DSG is operational. But robotic exploration and pilot ISRU plants are likely with commercial backing in early 2020s.

http://www.thespaceshow.com/recent-shows
13july Dr Mike Griffin
Would like to see lunar base along with focusing on ISRU especially oxygen extraction for fuel and life support. While being primary government lead/funded wants commercial involvement eg coms, power, cargo providers, ISRU


https://www.tmro.tv/2017/06/05/paving-way-moon-orbit-10-20/

CEO of WayPaver Foundation Michael Mealling joins us to talk about what they are doing to remove obstacles in the way of lunar exploration and settlement.


« Last Edit: 06/17/2017 09:46 AM by TrevorMonty »

Offline MATTBLAK

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Re: Should NASA refocus on returning to the Moon?
« Reply #368 on: 06/23/2017 02:26 AM »
Moon first is consensus of space agency leads:

Quote
COLORADO SPRINGS — With NASA’s long-term strategy for human missions to Mars in flux, heads of several space agencies said they supported initial missions to the moon as a key step before going to Mars.

During an April 4 panel session during the 33rd Space Symposium that featured representatives from 15 agencies, many expressed support for going to Mars only after building up experience at the moon first.

“We think that the moon is also a very important step. Mars is not the ultimate goal,” said Jan Woerner, director general of the European Space Agency. “The moon is an intermediate step to go to Mars, but the moon can also offer some special opportunities.”

Woerner, as he has done in recent years, promoted his vision for a “Moon Village,” a lunar facility that would include contributions from various countries and companies. “Moon Village is part of our overall strategy,” he said.

http://spacenews.com/space-agency-heads-see-the-moon-on-the-path-to-mars/

Surprisingly the head of the Italian space agency disagreed and suggested going straight for Mars.  Zubrin would be proud.
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Offline DougSpace

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Re: Should NASA refocus on returning to the Moon?
« Reply #369 on: 07/16/2017 05:31 PM »
Answer to the original question...

The US should adopt a policy of "Lunar COTS" at 7% of NASA's budget for a lunar program involving full-sized landers (e.g. Masten Xeus & ULA ACES-DTAL).  It should also fund the delopement of ice-harvesting telerobots and a large, flat-roofed, inflatable, surface habitat.  The IS should then urge other countries to fund their own companies to develop dissimilar, redundant components of the transportation, ice-harvesting, and habitation systems.

Offline Coastal Ron

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Re: Should NASA refocus on returning to the Moon?
« Reply #370 on: 07/16/2017 05:42 PM »
Answer to the original question...

The US should adopt a policy of "Lunar COTS" at 7% of NASA's budget for a lunar program involving full-sized landers (e.g. Masten Xeus & ULA ACES-DTAL).

That is the "how" to get something done, but not the "why". Why should the U.S. Government do that?

Does it satisfy a political need, and if so what?

Does it satisfy a national security need, and if so what?

Is it part of our nations continuing (but declining under Trump) desire to fund "science" because we know it has long-term payoffs? And if so, what is the rationale?

We in the space community are good at thinking up solutions, but we don't lack solutions, we lack a compelling reason for the U.S. Government to spend taxpayer money on doing this. What is the reason Congress will want to spend money on this, for decades to come?
If we don't continuously lower the cost to access space, how are we ever going to afford to expand humanity out into space?

Offline TrevorMonty

Re: Should NASA refocus on returning to the Moon?
« Reply #371 on: 07/16/2017 07:46 PM »
NASA fund lunar exploration and maybe small harvesting demo  but after that it should be purely commercial venture. If NASA wants to purchase lunar fuel or water and have delivered to set destination eg DSG all better.

Offline Propylox

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Re: Should NASA refocus on returning to the Moon?
« Reply #372 on: 07/20/2017 08:50 AM »
...What is the reason Congress will want to spend money on this, for decades to come?
Developing and proving Humans can live beyond Earth. Floating in a can in LEO, suckling the Earth for all resources doesn't count - no matter how many bugs, crystals or leaves we grow. It's science, really!

We need a lunar farm - an ecosystem growing its own food, recycling air/water/calories and extracting local resources like water and soil. I outlined a design meeting the a lander's minimum needs, using 13,320kg of "Propylox" propellant and associated tankage per trip in About reusable LM
https://forum.nasaspaceflight.com/index.php?topic=42294.0
The lander uses droptanks and has considerable downmass. The tanks are designed for future habitable use with an internal volume of 4.788 cubic meters and spherical caps of 1.25m diameter that can become ports. One downmassed hub would grow spokes, expanding its volume while being buried under a meter of regolith. That's a farm and permanent settlement, research and development on another body. That's science!

NASA fund lunar exploration and maybe small harvesting demo  but after that it should be purely commercial venture. If NASA wants to purchase lunar fuel or water and have delivered to set destination eg DSG all better.
If commercial wants to jump in the fray once habitability and transportation has been proven, they'll need to follow guidelines. But I wouldn't count on anything viable, much less expansive, developing. Probably plenty of powerpoints and investment pitches though.
« Last Edit: 07/20/2017 08:57 AM by Propylox »

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