2015年7月2日 星期四

Is Star Trek Tech Possible?

My friend Veronica Belmont is pretty cool. Nerd, writer, TV host… and now she’s doing an online video series with Engadget called “Dear Veronica”, where she answers tech/geek questions sent in by viewers. It’s a lot of fun.

In this week’s episode, she was asked, “Which Star Trek technologies will still be invented? Which are truly impossible and will never happen?”

Hey, I like Star Trek! So I’m really glad she asked me to field this question.

That was fun to record. But it was hard, too, since I only had 30 seconds, which didn’t give me much time to really dig deep.

But hey, I have space on the blog (haha – “space”! I kill me) so why not give a little more detail here?

Before we get started: Almost everything below is conjecture, based on physics as we know it. But I’m not an expert in all these fields, and I’ve been known to be wrong before. If you have better evidence, please let me know! Also, I’m assuming no major breakthroughs that negate or heavily modify the laws of physics as we see today. Keep that one in mind. All of these might be possible, but would involve huge breakthroughs that seem pretty unlikely to me — still, I'm no curmudgeon, and I'd love to see any of these technologies come true. I’m also trying to be brief here, to cover a lot of the quadrant. If you want details, Commander Riker might have already looked it up for you.

So let’s leave spacedock and take these ideas out for a shakedown cruise.

FTL

There are lots of problems with the idea of going faster than light. You can’t just accelerate past it like you can the speed of sound; it would take infinite energy according to relativity. And relativity tends to be right.

Other ideas include making a warp bubble, or punching a hole through space, or wormholes, but they all still have the same problem: causality. Moving faster than light is like time travel, and that opens up an entirely new can of Gagh.

So, I’m giving this a Nope until proven otherwise.

Transporters

In Trek, they’ve said many times that the transporter works by converting someone to energy, beaming that across space, and then re-matterizing them. The problem with this is that converting a standard redshirted human body (say, 50 - 70 kg) into energy is the equivalent of detonating well over a thousand 1-megaton nuclear bombs, which is a lot.

Even if you can contain that, how do you record someone’s “pattern”? That’s a lot of information. A lot. Theoretically, there’s an equation that describes every single subatomic particle in your body, but it’s a tad complex. Describing a hydrogen atom is already pretty hard, but put ten of them together and it gets fantastically complex. There are very roughly 1028 atoms in your body. That’s a big equation.

A better retcon would be to say you’re creating a subspace tube, encasing the traveler in a small force field, and plunging them through it. But even then, I don’t think subspace is quite so much real.

So: Nope.

Phasers

Phasers are like lasers but instead they start with a digraph.

OK, how they work is never really stated, but I heard from a friend who worked on Next Generation that they don’t vaporize you, they send you into subspace, where you die (see “Transporters”, above, except don’t use a force field). That’s clever, and I like it, but again with the not-real subspace.

Nope.

Artificial gravity/Inertial Dampening

These are tough. As far as we know now, there’s no way to do either (well, you can spin a spaceship to mimic gravity, but that has other complications; and besides, is clearly not what they mean by the term in Trek). These are fundamental properties of space and mass, and as far as we know, the laws of physics give these a big Nope.

Replicators

Replicators work on the idea that once you convert something to energy, you can then reconstitute it back as a different kind of matter. Cool, but transporters don’t work, so Nope.

Tricorders

Now we’re getting somewhere. Lots of things a tricorder can do we already have tech for. Infrared meters can read your temperature from a distance. Phones can listen for sounds, and do some basic image stuff too. This idea is based on reality well enough that there’s an X Prize for it.

So: Yup. Eventually, and kinda sorta now.

Communicators

Please. A device for talking to people over long distances that you have to flip open? What is this, the 2190s?

Nanotech

The idea of teeny tiny machines that can be programmed to do simple tasks doesn’t strike me as being all that far-fetched. We have some basics of this developed now. They’re a far cry from nanites escaping and taking over our (nonexistent) FTL starship, but this field is interesting. I wonder if they could be made generic such that in tandem they can do more complicated tasks. This sounds more like an engineering problem than one of physical laws, so I have to give this one a Maybe.

Force fields

The term force field is pretty generic. If you have a dense (strong) enough magnetic field it can deflect charged subatomic particles (electrons and protons) away from you, so in a sense we have those now. But something that can protect you from the force of an explosion, deflect bullets, and so on? I’m not even really sure how that would work.

But ignorance is no excuse, so to be honest I’ll give this a Maybe, just not according to what we know now.

Cloaking

I love this. YES. In principle, this can be done. You just need to deflect any photon coming at you from any direction so that once it’s past you it continues on in that direction.

Or, you could, for example, surround yourself with a device that can both detect and emit photons. It absorbs a photon, figures out what direction it came from, then finds the emitter on your opposite side and tells it to shoot off a photon of the right energy in the right direction. If you’re sitting still, and the light source isn’t changing, this should work. If you’re moving, then you better have really fast processors on your cloaking computer.

This would be very hard to build, and might be clunky, but it doesn’t violate any laws of physics, so I give this a Yes.

Universal Translator

We already have primitive but sortof effective translators online now. However, these take previously known languages and basically do really fast table lookups of the translations. This won’t work for an unknown language, let alone the squeals, grunts, clicks, whines, buzzes, pheromone exudate, cilia waving, and rapid eye blinks used in alien language. In Trek, that thing basically reads minds, so I’m pretty skeptical. Nope.

Turbolift

An elevator that goes up, down, and sideways? Willy Wonka had one of those in the 1960s.

Tractor Beam

In Next Gen they refer to the tractor beam — a device that can grab distant objects and be used to tow them — as using gravitons. These are theoretical particles that mediate the force of gravity in quantum mechanics, like photons mediate electromagnetism. However, gravitons have never been detected, and may not actually exist, which is a prerequisite for actually, y’know, existing. That doesn’t mean they don’t, it just means that a tractor beam is speculative, so I can’t give it the thumbs-up here. But Maybe, someday.

Artificial Intelligence

This is a funny one. I won’t worry about the existential issues of what intelligence is, because that’s a rabbit hole I don’t want to go down (though in detail it’s important; is intelligence an emergent property of anything that has enough complexity, or is it something that has to be specifically built into the hard/wetware?). But if we accept that humans possess intelligence, can we replicate it in non-human devices?

In principle, I have to say yes. But I wonder if we’re going about it the right way. Our brains simply don’t work like computers, despite the scifi trope. But if we can build machines that process information more like our brains do, then perhaps intelligence will emerge.

I’m no expert, and I’m spitballing here, but clearly it isn’t easy. I’ve been hearing that we’re just 25 years away from true AI for the past 40 years. Every time some breakthrough is made, it shows us that things are still a lot harder than we thought. Still, evolution seems to have done this naturally after just cooking slightly polluted hydrogen for a few billion years. People whose brains work a lot better than mine are working on it, too, and they seem to think it’s possible. So who am I to say no? Until proven otherwise, I’ll go with Maybe.

To Boldly Go…

So where does this leave us? Beats me. But whether the tech or the science of Trek is real or not, I still love the show. And while this stuff is fun to think about, they’re not the point of the show.

The point is the story, and the story is fun.

So: Second star on the right, and straight on ‘til morning. Engage.



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ISS Daily Summary Report – 07/01/15

ISSpresso: Kelly performed troubleshooting on the ISSpresso.  He was instructed to remove a deformed capsule lodged in the chamber and proceed with a nominal brewing.  The ISSpresso machine is a technical demonstration experiment that has the capability to provide hot beverages including espresso and still maintain the crema when dispensed in space. Capillary Effects of Drinking in the Microgravity Environment (Capillary Beverage): Microgravity affects the way fluids behave, and as such, crew members must drink from special sealed bags instead of using straws or normal cups. Capillary Beverage studies the process of drinking from specially designed Space Cups that use fluid dynamics to mimic the effect of gravity. In this instance of Capillary Beverage, Kelly used Black Kona Coffee to demonstrate how a complex fluid reacts to the cup’s special designs in an attempt to mimic the gravitational flow of a liquid through capillary forces. High definition video was used to capture the data and will be analyzed on the ground. Journals: Kelly authored a Journal entry today in support of the Behavioral Issues Associated with Isolation and Confinement: Review and Analysis of Astronaut Journals experiment.  Journals provides information on behavioral and human issues that are relevant to the design of equipment and procedures and sustained human performance during extended-duration missions. Study results provide information to help prepare for future missions to low-Earth orbit and beyond. Habitability: Kelly is scheduled to use the iShort tablet application to capture observations regarding the habitability onboard the ISS. Habitability assesses the relationship between crew members and their environment in order to better prepare for future long-duration spaceflights to destinations such as Near Earth Asteroids (NEA) and Mars. The ultimate goal is to understand how much habitable volume is required for vehicle internal design and layout, and if mission duration impacts the volume needed. Observations during the 1-year mission, as well as 6-month missions, can help spacecraft designers understand how much habitable volume is required, and whether a mission’s duration impacts how much space crew members need. The iShort application will enable ground support teams and human factor engineers to study and evaluate the design of the ISS and use these results for future spacecraft. Rodent Research Inventory: Kelly continued his review of on-orbit consumables and hardware required for Rodent Research operations.  The information gathered during this inventory is being used to determine what cargo is required for future manifests to support Rodent Research.  Following the loss of SpaceX-7, upmass availability is at a premium and this data point will provide ground teams with the knowledge of what is required to fly to the ISS while minimizing duplication. Acoustic Dosimeter Operations: Kelly set up the Acoustic Dosimeter to take sound measurements on the ISS. For crew-worn sessions the dosimeter was donned directly after crew wake and will be worn for 24 hours after which measurements will be recorded. For static deploy sessions, dosimeters will be deployed in the Node 3 and Cupola for approximately 24 hours. Japanese Experiment Module Remote Manipulator System (JEMRMS) Console Checkout: Kelly completed  a checkout of the JEMRMS Console.  During the checkout the Camera Control Panel (CCP), Remote Interface Panel (RIP), RMS monitor and hand controllers were activated. This activity is in preparation for HTV5 operations planned in August. Today’s Planned Activities All activities were completed unless otherwise noted. Inspecting RS Structural Elements Shell Surfaces using МВП-2К device. / r/g 9204, 9218 Audio Dosimeter Preparation JEMRMS – Final Activation before JEMRMS console checkout ISSpresso Brewing VIZIR. Battery charge preparation and initiation / r/g 9217 JEMRMS – Console checkout JEMRMS – Deactivation preparation after JEMRMS checkout Capillary Beverage MWA Preparation Capillary Beverage P/L Deployment SM Ventilation System Preventive Maintenance r/g 8393 Capillary Beverage Test Operations Data prep on monitoring RSOS structural surfaces for downlink / r/g 9204 UDOD. Experiment ops using DYKNANIYE-1 and SPRUT-2 sets. / r/g 9210 Capillary Beverage Stowage Journal – Survey Completion Habitability And Human Factors.  Observations Subject. Node 2 Nadir hatch reconfig to nominal, fully latched configuration LAB and Cupola Display and Control Panel (DCP) Powerdown Audit Life Science Hardware stowed in the COL AFT locations. VIZIR. Battery Charge / r/g 9217 IMS Delta File Prep ABOUT GAGARIN FROM SPACE. HAM Radio Session / r/g 9211 Stow Earlier Installed Formaldehyde Monitoring Kit (FMK) VZAIMODEISTVIYE-2. Experiment Ops / r/g 9213 Vacuum Pressure Gauge Accuracy Check / r/g 9212 WRS – Recycle Tank Fill VIZIR. Battery Charge  Completed Task List Items None  Ground Activities All activities were completed unless otherwise noted. METEON commanding JEMRMS ops OASIS video Three-Day Look Ahead: Thursday, 07/02: Multi-user Droplet Combustion Apparatus MWA Prep, CIR Hardware Review/hardware gather, HRF2 Supply Kit Resupply, Reconnection of MagVector Umbilicals to COL1F2 UIP Friday, 07/03: JEMRMS BDS Reconfig/checkout, Acoustic Dosimeters data transfer/stow, BCAT Intervalometer Change, MDCA h/w replace, 60P Launch (184/04:55 GMT, 7/2 23:55 CDT) Saturday, 07/04: Crew off duty, housekeeping QUICK ISS Status – Environmental Control Group:                               Component Status Elektron On Vozdukh Manual [СКВ] 1 – SM Air Conditioner System (“SKV1”) On [СКВ] 2 – SM Air Conditioner System (“SKV2”) Off Carbon Dioxide Removal Assembly (CDRA) Lab Standby Carbon Dioxide Removal Assembly (CDRA) Node 3 Operate Major Constituent Analyzer (MCA) Lab Shutdown Major Constituent Analyzer (MCA) Node 3 Operate Oxygen Generation Assembly (OGA) Standby Urine Processing Assembly (UPA) Process Trace Contaminant Control System (TCCS) Lab Off Trace Contaminant Control System (TCCS) Node 3 Full Up  

July 02, 2015 at 01:24AM
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C'mon, How Much Weirder Can Pluto Get?

Seriously, Pluto, what the heck are you up to?

As New Horizons gets closer every day, more details on the tiny world come into view. The latest? A very weird set of four similar dark streaks on the surface, stretching for hundreds of kilometers, and fairly evenly spaced.

What the WHAT.

Those streaks are really too small to say much about them just yet. They only appear to be on images from June 27, when New Horizons was close enough to see them and Pluto had rotated them into view (greyscale pictures from the long range camera were combined with lower resolution natural color images from another camera called, seriously, Ralph). The probe is only taking a few pictures per day as it approaches, trying to keep data storage to a minimum to save space for the big show coming in just over 11 days now.

It’s possible they’re multiple impact sites, but that seems really unlikely. They’re so evenly spaced… they’re also located very near the equator, and on the hemisphere pointed toward Pluto’s moon Charon. There’s been some suspicion that Pluto might be geologically active, spewing out jets of some material. Neptune’s moon Triton has dark geyser-like plumes, probably nitrogen from under the surface mixed with dust or some other dark substance.

Also, Triton (like Pluto) is a Kuiper Belt Object, an icy and rocky body from the outer solar system, captured by Neptune. Hmmmm.

What could drive such activity on Pluto? On Earth (or rather, under it) it’s the hot mantle moving under the continental plates that causes our tectonic activity. For Io’s volcanoes and the geysers of Enceladus (moons of Jupiter and Saturn) it’s tides from their parent planets.

Pluto and Charon are locked in both orbit and spin, so the tidal forces should all be balanced… now. However, it’s thought that Charon may have formed after a big impact on Pluto, blasting material into orbit that coalesced to form the moon. For some time after that event there would have been considerable tidal stress on Pluto, and the jets may have been active back then, leaving their marks on the surface.

The same is true for Charon as well, and the tides on it would be 10 times larger (since Pluto has ten times the mass of Charon). Note that Charon is a lot darker than Pluto. Did it have even more activity than its big brother?

With close encounter just a week and a half away, we’ll be getting more amazing pictures every day. Unfortunately, New Horizons will be dipping low over Pluto’s opposite hemisphere from these weird features, so we won’t get super close-ups of them. But we’ll certainly get some better shots over the next few days.

This is getting so exciting! Stay tuned.



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2015年7月1日 星期三

Mars Exploration Rovers Update: Opportunity Phones Home after Conjunction Healthy, Ready to Rove

After three weeks of being in a communications blackout on the other side of the Sun during the Earth-Mars solar conjunction, Opportunity phoned home, reporting that she is healthy and ready to continue her mission.

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Venus, Jupiter, and Noctilucent Clouds


Have you seen the passing planets yet? Today the planets Jupiter and Venus pass within half a degree of each other as seen from Earth. This conjunction, visible all over the world, is quite easy to see -- just look to the west shortly after sunset. The brightest objects visible above the horizon will be Venus and Jupiter, with Venus being the brighter of the two. Featured above, the closing planets were captured two nights ago in a sunset sky graced also by high-level noctilucent clouds. In the foreground, the astrophotographer's sister takes in the vista from a bank of the Sec Reservoir in the Czech Republic. She reported this as the first time she has seen noctilucent clouds. Jupiter and Venus will appear even closer together tonight and will continue to be visible in the same part of the sky until mid-August. via NASA http://ift.tt/1IrMOeT

Pluto In The Headlights

Color Images Reveal Two Distinct Faces of Pluto, NASA "New color images from NASA's New Horizons spacecraft show two very different faces of the mysterious dwarf planet, one with a series of intriguing spots along the equator that are evenly...

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NASA’s New Horizons Spacecraft Stays the Course to Pluto

NASA’s New Horizons spacecraft is getting a final “all clear” as it speeds closer to its historic July 14 flyby of Pluto and the dwarf planet’s five moons.

July 01, 2015
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