Daily Archives: January 12, 2011

What I Learned in Israel

Extra Bonus Post!  (Could not wait my turn for this one):

Two weeks in Eretz Israel.  What have I learned? 

*      An ibex (kind of gazelle) is small, really not any bigger than a goat.

*      Sunset on the Dead Sea turns the mountains of Jordan blood red.

*      Jesus was raised in a small mountain town.  (Our bus could barely manage some of the switchbacks going up to Nazareth.)

*      The Sea of Galilee would be at home in the English Lake District (minus the palm trees.)

*      A rock badger is neither a rock nor a badger.

*      The holier the site, the uglier the church.

*      The Church of All Nations (in the Garden of Gethsemane) is an exception to this rule.

*      Palestine is the Latin word for Philistia.  The Romans renamed Judaea with this word after the Jewish revolts to humiliate the defeated inhabitants, despite the fact that the Philistines had long disappeared into the dustbin of history.  The word has no historical connection to the people currently called Palestinians.

*      There is one lunch, pita, and falafel is its prophet.

*      The River Jordan is neither deep nor wide.  There appears, though, to be milk and honey on both sides.

*      Israelis and Palestinians really don’t trust each other.

*      The Dome of the Rock is pretty in its own way, but quite simply out of place on the Temple Mount.

*      One does not have to stand at the Wailing Wall to pray intensely—but it helps.

*      Sermon on the Mount (Matthew), or on the Level Place (Luke)?  The Mount of Beatitudes has both. 

*      The Muslims blocked up the Eastern Gate to prevent the Messiah from coming in.  The Jews and Romans blocked up the Tomb to keep him from going out.  The one attempt will likely prove as successful as the other.

*      The Holy Land is truly a miraculous place.  The same event there can have happened in two very different places at the same time (or more).

*      The Garden Tomb may or may not have been the actual place of the Resurrection (its tradition unfortunately is only a couple of centuries old), but it is what the Holy Sepulcher looked like two thousand years ago.

*      The Church of the Holy Sepulcher may not be the actual place either.  Helena (mother of Constantine) claimed to have found the True Cross there three hundred years after the fact.  Ri-i-i-ight.

*      There was an actual place.

*      It was empty on Sunday morning. 

One cannot capture the impact of this country in words.  One reaches for profundities and finds oneself grasping trivialities instead, on every attempt (as I have illustrated all too well above).  But that is the genius of the Christian faith.  It is rooted in History as the nexus of Incarnation.  It is rooted, in other words, in the concrete, mundane details of daily life and in simple Facts.   And those Facts in their very mundane simplicity, rather than abstract Ideas, are indeed our best handle on ultimate Reality.  (Not that Ideas do not have their place; but they get their meaning from their relationship to those Facts.)  It is out of a host of stubborn, small facts that the most profound Truths are revealed: facts like a baby crying in a borrowed feeding trough, and an unexpectedly empty Tomb; details that alone might seem to mean nothing—but when you put them all together . . .

When you put them together, you get something like this:  Baruch attah Adonai, Elohenu, melek ha olam!  Blessed art Thou, oh Lord our God, King of the universe, Who dost cause bread to spring forth from the earth, meaning from facts, Jesus from the Tomb.

 Amen.

 Donald T. Williams, PhD, who teaches at Toccoa Falls College in Georgia, USA, spent his Christmas break of 2011 touring Israel with the Toccoa Falls College Choir.  His most recent books include Mere Humanity: G. K. Chesterton, C. S. Lewis, and J. R. R. Tolkien on the Human Condition (Broadman), Credo: Meditations on the Nicene Creed (Chalice), and The Devil’s Dictionary of the Christian Faith (Chalice).  His website is www.doulomen.tripod.com.  He blogs at www.thejournalofformalpoetry.com.  History

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Science Fiction Problems: Time Travel Part I (slightly more complicated than most people think)

 

After a short break, I’ve decided to try and explain an apparently commonly misunderstood subject in science fiction: time travel!

This is the first part in a series. For part II, click here.

In this post:

  • Time is the 4th dimension and is directly related to 3-dimensional space, creating a manifold called space-time
  • Black holes distort space-time and theoretically allow for time travel if they don’t crush you with infinite gravitational force
  • Worm holes fold space-time, allowing travel between two points in space or time regardless of distance
Back to the Future Flux Capacitor

No, Doc, just… no.

Carl Sagan has been quoted as saying that time is “resistant to simple definition”, yet science fiction tends to be a little flippant with one of the biggest mind-bogglers in the scientific community. We’ve heard phrases like “space-time continuum” and “4th-dimensional space” thrown around in movies from Back to the Future to the Terminator, but in classic Hollywood tradition, they tend to gloss over the details important to the actual mechanics of time travel… usually so that they can take liberties with the way it actually works based on our current knowledge.

I’ll admit, it is a little…opaque, and we certainly haven’t figured it out yet (and we likely won’t this side of eternity), but it is not impossible to get a general grasp of the prevailing theories. For whatever reason it is very common for main-stream science fiction to make broad assumptions that only results in contradictions and peeved academics. So, here are some of the basics in the clearest terms possible in two parts, for your information and enjoyment:

Time is the 4th Dimension

time-warp spiral

No, this is not a representation of time as a dimension- I just thought it was cool.

We are all very familiar with the three dimensions of height, width, and depth as they are what we move around in throughout our daily lives, however, it may surprise you to hear that time itself is a dimension. While objects can move through three dimensional space, they also move through time, being in different positions and different states as time progresses, so that for each specific time there is an associated position in space. This means that position in space is directly related to time, hence the aforementioned and favorite buzzword “space-time”. This is an essential concept to absorb, so please excuse the science-speak if it burned your eyes to read. This is actually where a lot of science fiction goes wrong right off the bat, creating some silly explanation that ignores this relationship. In order to bend time, you need enough energy to bend space- which is estimated, depending on the method, to be upwards of half the mass-energy of an entire galaxy. Yeah. Flux capacitor or no, that DeLorean isn’t going far on garbage-power alone. This means that would-be time travelers need to resort to a few tricks of physics to get anywhere, but luckily our great universe is happy to cooperate, providing several naturally-occurring means (assuming current theories prove to be correct).

Black Holes, Spinny or Otherwise

schwarzschild black hole model

The Schwarzschild hole model in the clearest representation I could find

Kerr black hole

The Kerr black hole, the prettier and most often shown of the two

You’ve probably seen a few movies with black holes in them, but not many films highlight their time-bending properties, usually only providing a hazard for adventuring spaceships or the occasional space station. There are actually two kinds of black holes theorized (as I was honestly surprised to discover), one being the Schwarzschild black hole, which is roughly cone-shaped and simply draws in and crushes all matter with infinite gravity, and the other being the Kerr hole, the spinning swirl that is most often seen in science fiction movies. Black holes are created from the collapse of burnt-out stars, and it is theorized that if certain conditions prevail, the energy that usually creates a Schwarzschild hole spins and creates a Kerr hole instead, eliminating the matter-crushing singularity at the tip of the cone-shape and instead offering a window or portal to other times or parallel universes (if they exist; I’ll talk about them in Part II). In theory (mostly Einstein’s), because space is so distorted at the center of black holes, time itself is distorted, and if we could figure out how, we could enter that point of warped space-time and travel to the past or future. So, that’s the way it supposedly works with the better known method, now here’s the lesser known one.

Worm Holes (No, not like in Star Wars)

folding space time worm hole model

Black holes may be a staple of science fiction, but worm holes do not see nearly  as much screen time. The idea behind them is that objects of mass in space  distort space-time, curving it. Picture a sheet being held taut with a bowling ball  set in its center- the fabric bows under the weight and if you were to drop a  marble, it would roll toward the bowling ball. This is, incidentally, one of the  theories for how gravity works, but that’s a bit of a tangent. If you were to fold  the sheet so that there was space between the two halves, and then apply  pressure to the same point on both, the two points would meet across the gap,  as pictured in the illustration. If space time were folded in such a manner and  two corresponding points of pressure applied, it would theoretically create a sort of tunnel between the two, through which it might be possible to travel. It doesn’t matter how long that “sheet” is (how far away those points actually are from one another), if the fabric of space can be folded like this, it is as if there is no distance between them at all. This is great way to shorten distances in space to avoid the necessity  for faster than light travel, but it would work similarly for time as well, theoretically allowing for travel between any two points in time.

I hope this hasn’t been all too confusing, but as I see I am running a bit long here, I will pick up this subject next week in Part II, discussing a few other potential means of time travel and also a few of the problems with it that are often ignored.

So, what are some of the badly-done time traveling stories you’ve read? What about stories that handled time travel in a respectably convincing way?