Ultimately, Time Travel is essential for Space Travel

17 04 2011

Long-time readers may note that this blog bounces (veers?) between space-related content and time/temporal physics-related content.  Today, aside from admitting that (not surprisingly) the two topics are primary passions of mine, I’ll tell you why they’re related, and intimately so.

It’s all Einstein’s fault.

After an interstellar trip, a faulty suspended animation chamber reduces an astronaut to an ancient corpse. (From Planet of the Apes; Credit: 20th Century Fox)

Put very simply, according to Relativity: When dealing with events in the universe, it is impossible to separate the distance of space from the passage of time.

This is why astrophysicists and cosmologists speak of actions in the universe occurring and affecting “space-time.”  (Hence the “space-time continuum” that makes such a frequent appearance in sci-fi technobabble.)

What does this mean for us?  Well, in day-to-day experience, not much more than the odd reality that the moon we see is 1 second old.  Similarly, the sun we see is lagging 8 minutes behind us in time.

Why?  Well, it takes the light that bounces off of the surface of the Moon 1 second to cross the 230,000-mile distance between the Earth and Moon to strike the retina of your eye, and it takes 8 minutes for the light that leaves the sun to cross the 93-million mile orbital void to get to Earth and reach your eye.  As a result, we see the Moon and Sun as they appeared when the light left them, not when the light reaches us.

The same can be said of distant stars.  The farther away a star is, the older it is. (Even if it’s 200,000 light years away – then you’re seeing it the way it looked 200,000 years ago.)

So, quizzically, yes – this means that universe we see is actually a horrible garble of apparent objects from intermixed times.  Fortunately for us,  compared to the incredible speed of light, we’re close enough (distance) to everything we need to experience, (e.g., our limbs, food, loved ones, walls, etc.,) so that this time lag is unnoticeable.

But when we start peering out into the rest of the cosmos, this distortion really matters.  Many of the stars we’re studying may have already exploded… but if they exploded a few years ago, we won’t know it until light from the explosion reaches us, which could take millions of years if the star is far away.

Now, let’s take our time-distance thought exercises a step farther and ask what happens if we score the holy grail of the Search for Extraterrestrial Intelligence.  What if, for the sake of argument, we receive and translate a friendly message from an incredibly advanced race of aliens?  And what if, by fortuitous happenstance, they (hoping to aid other, younger life-forms) offer unlimited knowledge to any beings that can meet them on their world, face-to-face?  Well, the offer doesn’t do us more than a hill of beans of good if it takes us 200 years for a multi-generational craft to get there, only to find that the benevolent race has gone extinct due to a problem with their parent star.  We want to reach them as soon as we translate the message.

We want to separate the distance of space from the passage of time.

So, if we can conceptually and technologically conquer time travel, we will have in essence conquered space travel.  If one can manipulate the passage of time, then the time taken to cross the distance of space with any type of propulsion system becomes an almost trivial tally – little more significant than the miles-per-gallon of a modern automobile.

Conventional propulsion systems will get us around in space for the foreseeable future, and more exotic systems will likely take us to the nearest stars.  However, I believe it will be the mastery of time that will transform our race from provincial planet-hoppers to truly savvy, galaxy-trotting, cosmic-colonial game-changers.

Something to think about.


Hawking Space Exploration Paradox: Death or Enslavement

27 09 2010

Dr. Stephen Hawking. (Credit: Associated Press)

During the last six months, famed theoretical physicist and science oracle Dr. Stephen Hawking has proposed much to garner headlines.  (A suggestion that ‘universe creation’ may be a natural process comes to mind.)  However, when looking at the implications of his recent propositions, a hidden space exploration paradigm takes form.

It would seem that in Dr. Hawking’s best estimations, space exploration is inexorably linked to the struggle for humanity’s survival.  His astro-colonial challenge is framed between two opposing threats: The first is that if we do not learn to cooperate and start concerted space exploration and colonization, the human race will wipe itself out in two centuries; The second is that advanced alien life is certain to exist, and if we reveal ourselves to the extraterrestrial environment, such life will pose a threat to our civilization (a la War of the Worlds).

What does this mean?  Well, this might initially seem to imply a “damned if you don’t, damned if you do” paradox, which I mentioned as this post’s title.  However, when developed further, the propositions have a deeper implication: A golden path between the chasms on either side.

By assessing Dr. Hawking’s admittedly apocalyptic predictions in reverse, he essentially states that we’ll make it if we create a synergy of earnest, cooperative space exploration and diligent, even paranoid SETI (Search for Extra Terrestrial Intelligence) reconnaissance.  In doing so, we engender the maturity of our civilization on Earth, develop resource and environmental security for our perpetual existence about the Sun, and cultivate an advanced awareness of our stellar neighborhood – an early warning system for potentially threateneing ETIs (extraterrestrial intellegiences).

So, it’s possible he’s really saying that we have a shot.

The first step in evading threats is cultivating an awareness of them.  In that light, maybe that’s the reason he’s come out with these statements lately – to help us find the razor’s edge between self-destruction and galactic naivety.

Just a thought.

%d bloggers like this: