Could we build a bridge to the moon?
For centuries, mankind dreamed of the moon and those dreams were mostly realized in
1969 when Armstrong and Aldrin set foot on its dusty surface.
Since then our sights have slowly but surely turned towards Mars, but that hasn't stopped a few people from contemplating one day
colonizing our closest celestial object. But even space launches to the
International Space Station are still fraught with danger and
Missions to the moon even more so. Which is why some people have suggested a way to mitigate these risks by building a more permanent
Structure: a bridge to the moon.
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For a frame of reference, the moon is an average of two hundred and thirty eight thousand nine hundred miles away. The ISS is only
250 miles away, and the building of that is considered one of the greatest technological feats of recent times. For even greater
context, the distance to the moon is also almost ten times the circumference of the Earth itself
Meaning that a construct capable of bridging between here and there would also theoretically be able to wrap itself around the entire planet ten times.
The current tallest building in the world, the Burj Khalifa, is only half a mile tall (or
829 meters) so this moon bridge would need to be the same length as roughly half a million Burj
Khalifa's stacked on top of each other, reaching all the way out into outer space.
But perhaps the greatest hurdle of all isn't even the length of the bridge itself,
but rather that the distance between the Earth and the moon is constantly changing, depending on tides and where the moon is in its orbit.
it drifts between
225,000 and 252 thousand miles, which has the difference alone measuring at
27,000 miles. That's around
54,000 Burj Khalifa's!
While, in the grand scheme of the cosmos, it isn't a particularly large figure it clearly makes all the difference in whether our bridge to
the moon could ever actually reach its destination.
But there are more problems outside of just how something like that would even be scientifically possible,
namely the question of even if we could build such a structure, who would actually do it? To stick with the Burj Khalifa
comparison, this enormous tower had a construction cost of 1.5
Billion dollars - a fair price for half a mile of skyscraper, but the bill for our bridge would be, appropriately enough,
astronomically expensive.
It'd easily become a single most expensive
construction project in the history of mankind, and that's before you take into account that when you finally get to the moon you need to
build even more things to create a reason to go
there at all.
Since we're increasingly relying on private companies like SpaceX to get us to Mars, perhaps the most likely scenario would be another
eccentric billionaire showing up ready and willing to fund a headline-making though ludicrously expensive
project. It's not exactly beyond the realms of possibility, though.
One company, Moon Express, has already received permission from the United States government to build outside of Earth's orbit.
Who knows, maybe someone somewhere is already mapping an earth-to-moon superhighway. Another company with similar goals to Moon Express is the
Obayashi Corporation, a Japan-based business which in 2012 announced its plan to build an operational space elevator by 2050 - or even as early as
2035. A space elevator is essentially a Space Station built in geostationary orbit at least
22,000 miles above the Earth's surface, which is kept tethered to our planet by a huge cable which ideally doubles up as a
Transport link. In theory, the development of a space elevator is the first step on our journey toward building a similar
transportation system to the moon, giving us valuable information for what problems we would face. The Obayashi elevator, if it's completed, will rise
60,000 miles up in total, but
also travel at a speed of 120 miles per hour - making it much slower and arguably safer than a commercial airplane. But
some are already trying to trump standard space elevators - notably LiftPort,
which is a crowd-funded
campaign aiming to build a lunar elevator direct to the moon. The project has already raised more than 100 thousand dollars.
The elephant in the room
when it comes to all of these projects, though, is the material.
Simply put, there's no known material on Earth which would be able to reliably endure the in-part unknown rigours
necessary in order to remain stable in outer space.
The structure would be too high up to be properly
stabilized by gravity, so would instead be dragged through space at the same speed the earth rotates at...
Which is a thousand miles per hour. Even if the bridge
was built entirely out of diamond, it wouldn't be strong enough to withstand the g-force - though it certainly look spectacular.
This is part of the reason it's going to take Obayashi so long to build their elevator, because they are currently waiting for the
development of tech strong enough to suspend a space station in perpetual orbit.
For most engineers and experts, there's only one material that might be up to the task...
Carbon nanotubes. The Russian Academy of Scientists, in particular, have worked to make nanotubes a viable option.
They're lightweight and 50 times stronger than the materials we currently have, but they're difficult and expensive to produce.
Regardless, the likes of Obayashi are holding out hope that
nanotubes will one day be mass-produced.
The flexibility problem is still an issue, though. More than anything else, our bridge would need to be bendy - either
curving according to the distance to the moon or able to lengthen and shorten itself to account for the changing mileage.
What's perhaps even more pressing, though, is that it's almost certainly impossible to build
something that's permanently fixed to the Earth at one
end, while simultaneously fixed to the moon - given that the moon (like the Earth)
rotates. So, for a permanent bridge we need to find a way to stop the moon
rotating, by building something strong enough to counteract its spin. It's not possible, but if it were it would cause untold
chaos to our earthly lives.
Plus, such a move would see the moon begin to fall towards us, meaning our bridge would also need to be strong enough to hold
up the weight of the entire moon.
Clearly, having a retractable mechanism of some kind is the most reasonable
solution, with advocates arguing that we could have short-range landing craft
or shuttles to take us down to the actual surface - which, relatively speaking, makes a lot of sense.
There still remains the bigger question of why we want to build this link to the moon in the first place, but it would quite
literally open up a whole new world of possibilities.
Perhaps the bridge would be a useful go-between for mining endeavors, since the moon is rich in resources like gold and platinum.
Maybe it would become the primary route for anyone looking to relocate for a lunar lifestyle as part of Earth's first steps toward
colonizing other places in the solar system. Or, a moon bridge could simply see the moon
become an off-Earth base from which pioneering astronauts can more readily launch towards Mars and elsewhere.
Ultimately a bridge may (or may not) be the best path to take. While some kind of
monumental structure soaring into space feels inevitable in the future, an A to B bridge
feels incredibly unlikely. But, say retractable space roads really did become a reality, that kind of tech really would give us the moon.
What do you think? Is there anything we missed?
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