Tag: manned spaceflight

The Day After the Day After Tomorrow

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In the comments for yesterday’s post on anti-matter there was some discussion about the methodology for interstellar travel; matter/anti-matter annihilation as a form of impulse power versus the use of a worm hole to poke in and out of space as needed.  As was intimated (being turned inside out) the current understanding of general relativity does not present any clear mechanism for human beings to utilize such a phenomenon and remain alive.  And that got me thinking.

Five hundred years ago if you wanted to go from Portugal to India you would get on a sailing ship and circumnavigate the continent of Africa and then cross the Indian Ocean.  And when you returned from this trip thirty months would have passed.  Today, a direct flight from Lisbon to Calcutta would take about twelve hours.  Call it a day for a round trip.  That’s about 900 times faster than the old way.  A trip to Mars at its shortest takes about six months.  Adding in the return trip makes the whole voyage something like 26–34 months.  If somehow, we could increase our speed by the same 900 times we could go round trip to Mars in a day.

Of course that’s impossible.  But only in the sense that we would be trying to improve the same means of travel in the future case.  So, if you told Vasco da Gama he could make a round trip to India in one day he would assume you were either joking or insane.  Because the very idea of a jet plane was an impossibility in his world.  Before you can have jet planes you need Galileo, Newton and Maxwell.  In other words, you need the mathematics, physics, chemistry and engineering of the seventeenth, eighteenth and nineteenth centuries to know that a jet plane could exist.

What if the mathematics, physics, chemistry, biology and engineering of the twenty second, twenty third and twenty fourth centuries conspire to make the round trip to Mars only one day by finding a completely novel approach to travel.  What if wormholes really could be harnessed for human transport?  Then a day long trip would just be a convenience for meals whereas actual travel time would be zero.  But you argue, “wormholes are a theoretical aspect of relativity that have never been observed and if they exist would be as inimical to human life as a black hole would be.  And I would counter that feeding flammable liquids like octane into a machine that produces electric sparks and depends on metal parts rotating thousands of times per minute is much too dangerous a method for transporting humans from place to place.

So, I won’t say I know that we’ll ever reach the stars.  But I think anyone who says categorically that we cannot is making assumptions that cannot be taken as fact.  They are conjecture based on the current understanding of physics and engineering.  So, I guess we’re free to fantasize about galactic empires and worm holes and warp drives and anything that makes us happy.  And some days I want to read about the day after tomorrow and other days I’ll dream about galactic empires.  Why not?

Guest Contributor – Tregonsee – 12FEB2026 – LOR OR VOR

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There are 3 basic strategies to get to the moon. Direct is the is the first, the ship/capsule takes off from Earth goes to the moon, lands and then some part of that capsule/ship takes off from the moon and returns to earth. Because you’re carrying LOTS of weight you don’t need at various points (e.g. the reentry shield on the capsule is dead weight as you land on the moon) the whole thing is VERY heavy. The rockets to do this are immense (e.g. the early NOVA concept https://en.wikipedia.org/wiki/Nova_(NASA_rocket) later repurposed but never used for mars exploration). The other two alternatives are Earth Orbit Rendezvous (EOR) or Lunar Orbit Rendezvous (LOR). In EOR, you go up to a waiting lunar specific lander board it and use it for the earth to moon trip land and return to your Earth/space vehicle. This is the Von Braun/2001 model. It’s one weakness is it usually requires in space refueling of your lunar transit/lander vehicle. This is kind of what I suspect the initial SpaceX model SEEMS to be headed for with a combination of Dragon Crew, Starship cargo/fuel ferry, and Lunar Starship for transit and landing. The Apollo (and current Artemis) use LOR, with Apollo sort of used a mixed model to keep the LEM as light as possible (for a great dramatiztion of this find episode 9 of From the Earth to the Moon, also good discussion of LOR vs EOR). I think SpaceX/Musk have realized lunar Starship is overkill for the task presented, thus making EOR more feasible. They also know Starship overall depends on refueling; if they can’t do that it is kind of game over for Starship for any purpose other than LEO delivery of cargo/ satellites.

Tom’s World – 11FEB2026 – Red Planet Blues

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TomD

Getting to and from Mars is easy as long as you have Delta V. You need a velocity of approx. 7 mile/second to break earth orbit and around 20m/s to get to mars and more to match mars orbit. And that’s minimum energy, you’d probably want to double that at minimum to get the total ET down to something humans could handle.

I’ll leave it up to you to calculate the total energy requirement in joules or whatever to accelerate that much mass and fuel to a total Delta V of around 50-60 miles/second and how to do that with chemical reactions.

We got Voyager out of the solar system and up to 25-30 miles/second total energy but that’s when you have years to hop from planet to planet sling shotting around each to gain velocity.

Practical Mars will have to wait on fission at minimum or fusion and you still need reaction mass.

The moon is cool.

Back in the Apollo days of the early 70’s, I met a couple of students from U of Wisconsin on sabbatical traveling around the country and working odd jobs for cash. They were only here (Atlanta) for a couple of months before moving on and we got along save several heated debates on the Apollo program. It was their position that Apollo and all similar projects be immediately defunded until human perfection was achieved, though they didn’t state it in such stark terms, the implication was such had they the desire and ability to extrapolate. Even at the time I knew that was absurd and the purest fairyland fantasy because that condition would never be met and the net effect would be to condemn the planet to the darkness. It was my 1st exposure to hard-hard idealistic leftism. I had already left the Marine Corps but that train of thought and logic not common there then or now, I suspect.

Elon Musk Bows to the Scientific and Economic Wisdom of photog and Pivots to Luna City Goal

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Last June I wrote a post called Moon Mining in which I made a lot of hyperbolic statements about my future as a miner of precious metals on the Moon.  But in a more serious vein (no pun intended?) I said, “But seriously, I think there is a lot more likelihood of the Moon becoming economically useful to humans than Mars.  The difference in distance alone makes Mars almost impossibly difficult for manned flights.

The Moon on the other hand was reached more than fifty-five years ago by men whose technological capabilities were rudimentary compared to what we have at our disposal today.  Imagine what improvements modern computing power and automation could do to make reaching and working on the Moon safer and easier.”

And then there’s this post from last week, “It’s Shiny and New” where I talk about Luna City.

And here we are a few days later and this headline appears:

“In a reversal, SpaceX prioritizes ‘city’ on the moon over Mars project, Musk says”

In the article it says, “Elon Musk said on Sunday that SpaceX has shifted its focus to building a “self‑growing city” on the moon, which could be achieved in less than 10 years.

SpaceX still intends to start on Musk’s long-held ambition of a city on Mars within five to seven years, he wrote on his X social media platform, “but the overriding priority is securing the future of civilization and the Moon is faster.”

What else do I need to say.  Elon, there’s no shame in admitting you’re wrong when someone gently reminds you that wisdom is still a higher authority than Midas-like wealth.  Well, he’s still relatively young and there’s time for him to learn what’s really important, namely building Luna City and naming the main street Neil Armstrong Blvd.

Seriously, I was starting to doubt whether he wasn’t just blowing smoke with all the Mars mission talk.  That stuff is a generation away.  Building and maintaining a permanent Moon base is an achievable goal that will show us whether human habitation beyond the Earth is feasible and profitable.  If it isn’t it’s better to learn that from a place where retreat takes a couple of days rather than a year.  Trillions of dollars and, more importantly, lives would be saved.

So, get going Mr. Musk.  Sell the boys in Washington a plan to build something like a town on the Moon.  You’ll make a whole lot of money and you’ll spark the imagination of a generation of boys whose grandfathers thrilled to the Apollo landings.  Just make sure you do a good job on the accounting so it won’t come back to haunt you when the Democrats come back into power.  They’re a vindictive bunch and they love to punish people whom they hate and from everything I’ve read they hate you now even more than they hate people like me.  And that’s a whole lot of hate anyway you stack it.

I have to confess I’m actually kind of excited to hear this goal.  I think he can get this done.  I’m guessing Trump would like to have his name involved in it too.  That quite a combination.