How could Ilan Ramon’s Diary Survive the Fall from Space?
Oct 21st, 2008 | By mooeypoo | Category: Articles, Astronomy, Physics
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A little while ago, the Israeli Museum in Jerusalem opened an exhibit featuring some of the torn, slightly burned pages of Col. Ilan Ramon‘s personal diary from the shuttle Columbia. Ramon was the payload specialist onboard STS-107 (the spaceshuttle “Columbia”) that disintegrated during re-entry from space, killing all 7 crewmembers onboard. The diary survived the re-entry and subsequent crash, and was found in a field next to Palestine, TX.
Ramon’s personal diary fell close to 37 miles (almost 60 km) through the extreme conditions of re-entry. Unlike its human owner, it has survived the process and is now being restored and presented to the public in the Israeli Museum in Jerusalem.
During the weeks and months after the Columbia disaster, pieces of the debris were still being collected from wide areas in Texas. small pieces of insulation that detached from the outer parts of the shuttle to pieces of the Astronauts’ space suits. In an article covering the subject on “Universe Today”, The Israeli Museum curator is quoted as saying that “There is no rational explanation for how it was recovered when most of the shuttle was not.” It is no wonder, then, that many are awe-struck at such an apparent miracle.
But is there, really, no rational explanation for the survival of the diary? None at all? I doubt that. And when I doubt, I check it out, which is exactly what I am about to do.
A thought (or two) about Hypotheses
The information about the Columbia disaster is available in many online and offline sources, but it is still very limited. We can guesstimate what happened to certain parts of the shuttle based on facts on the ground and what we already know from previous manned missions to space using the Columbia shuttle.
The general investigation I am about to embark on in this post is based on the material I have found online and my own personal knowledge, strengthened by facts from other missions and physical concepts. It is by no means complete, and I had no time (or resources, sadly) to do a full blown investigation into the full train of events that Col. Ramon’s diary went through. If you have any thoughts on the matter, or if you hold any factual data that will help hypothesize what it “went through” in the moments before hitting the ground, please share them in the comment section. I am very much willing to update and upgrade this hypothesis in light of new information or ideas (just make sure you base those on valid data, of course).
I try to support my guesstimates with valid data when I can, and use ‘extremes’ to get us a rough idea of how this discovery (and this ‘survival’ of such an item) is possible.
The Space Shuttle – Crew Quarters
The space shuttle is built to sustain its crew for days (and sometimes weeks) in space. It has sleeping bunks, restroom and shower, all located in the crew area in the “Mid Deck” (picture is taken from Space Shuttle News Reference (NASA), p 5-5):
According to ex-astronaut R. Mike Mullane, the mid deck also holds the crew personal lockers (“Do Your Ears Pop in Space”, R. Mike Mullane, pg 135). We will remember this fact when we consider the process in which the Columbia disintegrated (keep reading).
Where was the Diary Located?
No one can know for sure (at least not from the published data that I’ve read) where the diary was located before the Columbia’s disastrous descent. However, there are a few facts we can be sure of:
- The crew was about to come home; their personal items were, most likely, locked away in their personal lockers, that are located in the Mid Deck.
- According to astronauts who were active in previous missions, a diary is sometimes put in the lower pocket of the flight suit. If the diary wasn’t locked away in Ramon’s personal locker, it is logical it was safely tucked into his flight suit pocket. Flight suits are very durable and tolerate extreme heat and cold conditions.
Either way, it seems logical to assume that the diary was placed somewhere that kept it safe from the initial processes of re-entry and descent.
Temperature Variation
Unlike common belief, the intense heat on the wings and body of a space shuttle as it descends from Space is not caused by friction, but rather by ‘compression’. The big body of the shuttle compresses air molecules downwards so strongly that the air around the shuttle becomes dense and packed like plasma. At this point, the wing-edge temperature naturally rise, and can reach a temperature of about 1,400° Celcius (2,500° Fahrenheit).
After the initial temperature rises, the Columbia initiated a roll to the right, a maneuver that decreases its speed and the heat on its body. This maneuver was successfully performed, and following it were 10 minutes where the heat on the body of the shuttle reached its peak. From there, it started to cool down.
The temperature at these heights is extremely low, and the heat from the shuttle can dissipate relatively quickly.
Explosion vs. Disintegration
About 15 minutes after the Columbia entered the Earth’s atmosphere, pieces of debris were visibly shedding out of its body. But the Columbia did not explode, it disintegrated, and this difference is very important to understand what happened to the parts inside the shuttle.
Explosion and Disintegration are two very different processes.
- Explosion (from Merriam Webster Dictionary):a large-scale, rapid, or spectacular expansion or bursting out or forth.
- Disintegration (from Merriam Webster Dictionary): 1 : to break or separate into constituent elements or parts 2 : to lose unity or integrity by or as if by breaking into parts.
Explosion is quick and “dirty”, resulting in a lot of damage to the individual parts. Disintegration is the breaking apart of the whole into individual, smaller, parts. It is usually slower, and gradual. The Columbia’s disintegration began about 10 minutes after re-entry and lasted until the massive body crashed on the surface. The various parts and debris were scattered over an enormous area, from eastern Texas to Western Louisiana.
The fact that the Columbia disintegrated, rather than exploded, has two main meanings for our investigation:
- The Columbia did not ‘explode’ all at once; it took time for the various parts to separate away from the main body while the shuttle was cooling down in descent.
- In an explosion, the parts heat up due to the exerted energy. When a body disintegrates, the parts separate away from the body without experiencing any sort of extra heat. If a piece was deep inside the shuttle, it wasn’t subjected for the intense heat from the plasma (during re entry). It would take it longer to be thrown-away and out of the body of the shuttle. It would, therefore, “spend” less time free-falling.
The objects inside the Columbia slowly broke apart and began a gradual free-fall to the ground, from varying heights, the largest of which is approximately 60 km above the surface of the Earth.
Disintegration = Change in Shape
The shuttle is designed and built for aerodynamic movement. From the nose, to the wings and tail, the purpose is to make sure its movement in the air is smooth and with as little drag as possible. This is meant to decrease drag and allow the pilot better control over the movement of the shuttle once it’s back inside the atmosphere.
Aerodynamic objects move very quickly through the air because of their shape. But Columbia began disintegrating about 40 minutes after initiating the ‘de-orbiting’ maneuver. Parts tore off its body, probably starting with the wings and tail (that ‘stick out’ of the body and are subjected to more heat and pressures). Once those pieces – and pieces of the outer hull – tore off, the Columbia lost its aerodynamic shape. From this point on, it will slow down dramatically.
Terminal Velocity of an Object
In reality, when an object falls from a certain height down to the ground, its velocity increases because of the pull of gravity. Air resistance, however, exerts a force upwards – “fighting” the downward acceleration. When both forces are equal, they both negate one another, and the object falls in a constant speed (without the effect of any acceleration). That speed is called ‘terminal velocity‘.
For example, a sky diver falling from 12,000 feet would stop accelerating (hence, would move at a constant speed) at about 200 kph (124 mph). If his parachute didn’t open, he would hit the ground at the same force that a motorcyclist going at 200kph would hit a cement wall in case of a head-on collision (don’t try this at home). The height, in the case of the speeding diary, is not a very good indicator as to the force it hit the ground with.
Terminal Velocity and the Falling Diary
Assuming the diary was protected during the initial stages of the disastrous descent (as I’ve already explained), it shouldn’t have fallen as fast as it may sound like. When we hear the height “60 km above ground”, it sounds as if the falling object would hit the ground at enormous speed (and force). That, however, isn’t the case, because of the terminal velocity.
It is very much possible that the diary was packed or partially protected during parts of the fall, stopped accelerating at the terminal velocity. The pieces continued to disintegrate as they fell, and at some point whatever ‘protected’ the diary disintegrated and exposed it to the full force of the fall. But by that time the conditions that existed at the beginning of the fall were considerably lessened.
Conclusion
- Based on past missions and the structure of the Space Shuttle, we can safely assume the diary was encapsulated inside an item that protected it, either a closed locker or a sealed space suit pocket.
- Air resistance (and the laws of physics) makes the speed of falling objects limited.
- The diary was found in a damp field covered with soft leafs (provided a relatively soft landing).
- Other pieces of debris survived the long extreme fall to Earth (see next section).
Based on all the above, it is a bit easier to see a logical trail of events that could lead to the survival of a paper diary. This isn’t a miracle; it’s a surviving piece of history in light of a horrible, disastrous space mission.
A bit of Realism (Other objects made it, too..)
So we’ve examined the situation, and saw that it’s not as unlikely as we might have first thought for such an item to survive the Columbia disaster. A lot of other debris have survived, including ‘sensitive’ materials such as CPU boards and pieces of cloth from the astronauts’ uniforms and rest area. But we also need to take into account the condition in which the diary was found.
According to the State of Israel Ministry of Public Security, which was responsible for the reconstruction and preservation of these pages, the diary was very hard to decipher. It was found wet, torn and crumpled in a muddy field (see picture). The efforts involved a lot of digitized reconstruction along with some measure of guesswork. Some of the text on the pages was simply incomprehensible.
That said, it is also important to remember that this is not the most “surprising” piece of debris that “survived” re-entry. If you want surprise, it is reported that a few worms survived re-entry and the fall to Earth. Yes, alive. A piece of crumpled, wet, torn paper, as emotional and touching as it may be (and I agree that it is), is hardly any competition to life forms surviving the fall to Earth.
This is no miracle.
Many thanks to Capn_Refsmmat for (again!) being the brevity King, and for asking questions that needed to be answered.
References and Resources
- The Physics of Space Shuttle Re-Entry: http://www.bbc.co.uk/dna/h2g2/A6381038
- Report of Columbia Accident Investigation Board, Volume I: http://www.nasa.gov/columbia/home/CAIB_Vol1.html
- Space Shuttle Orbiter Specifications: http://en.wikipedia.org/wiki/Space_Shuttle_orbiter#Specifications
- Columbia Accident Investigation Board (Official Site): http://caib.nasa.gov/
- STS107 Reentry Timeline:
http://en.wikipedia.org/wiki/Space_Shuttle_Columbia_disaster#Destruction_during_re-entry
- Space Shuttle Blueprints: http://www.militaryfactory.com/blueprints/spaceshuttle.asp
- Space Shuttle Operational Book: http://spaceflight.nasa.gov/shuttle/reference/sodb/
- Columbia debris adds to re-entry research: http://www.msnbc.msn.com/id/5333706/
- Columbia Breaks Up During Reentry; NASA Fears Crew Lost: http://www.spaceref.com/news/viewnews.html?id=722
- Israeli Ministry of Public Security: http://www.mops.gov.il/nr/exeres/BD8C3AB6-6D05-462F-91B3-AA98E3986B24.htm
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Print This Post
October 24th, 2008
11:57 pm :
Well done. However, I must take issue with the following line:
“… it’s a surviving piece of history in light of a horrible, disastrous space mission.”
The mission itself was _not_ disastrous. In fact, it was quite productive whilst on-orbit. The EDL part — _that_ was disastrous; and launch could possibly be included, as that’s where it started. I’m sure you didn’t mean it that way, but that’s how it reads. Other than that criticism, your rational review of it was a good read.
Reply
Thank you
You’re absolutely right, and to be honest, I noticed this after posting. I meant that the ending was disastrous; the mission itself wasn’t. It might be better phrased as “.. it’s a surviving piece of history in light of a horrible, disastrous *END* of this space mission”.
Actually, I think that even out of the pieces that survived (some hard drives, the [live] worms, etc) it was possible to extract very useful information about the experiments that were conducted while in orbit.. I will have to look it up, though, it might make for a great post, examining the benefits of the experiments that were done in orbit with the STS-107.
I’ll think of a better way of phrasing it and will change it in the post – I didn’t really mean to say the entire mission was a disaster. Thanks for pointing this out to me
Reply
October 27th, 2008
11:45 am :
This was very well written and informative. Thank you.
-B
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February 16th, 2009
12:44 pm :
>>the purpose is to make sure its movement in the air is smooth and with as little drag as possible.
err, not quite.
During most of its descent it comes in belly first, to give it the most drag so it can slow down.
It is designed to avoid turbulence.
Only when it is in the lower atmosphere does it start flying like a normal airplane.
Reply
@jayrtfm,
You’re absolutely right. In the article, I meant the movement at a bit lower heights, seeing as the Columbia made the “roll” and maneuver that transforms it from high-drag position to more of an airplane-like position.
But I completely accept, you’re right, this depends on what height – the first stage is the increase the drag and to get the shuttle to slow down.
Thank you for the comment!
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In the last 11 yrs, Audi had been victorious on the Le Mans nevertheless exertion of the Company out of Australia has been comparatively around; they’ve been nervous through adding everybody who’s not much of a realize safe bet driving this rims from the passenger cars. They’re far more shy to help make men and women who definitely are never Europeans commute the passenger cars. Everything that this is really saying is definitely you ought to could not really am People from france, toss funds in some places, and reveal to drive the high-level prototype. Skills is to be proven.
Tucker has the ability that the Business wants. Inside the four decades for this race occupation she or he seemed to be associated with 91 terrific occasions. Although he / she quite simply came into the experience due to the fact he or she spotted the application mainly because a specific thing pleasure you need to do, he / she should go driving the number of effort a normal would definitely inside decade. During that time, this individual was first the winner inside 50 fantastic backrounds not to mention happened your podium earnings associated with fladskærm intervals.
A The Mans events usually are famed just for absolutely doing damage to new or used cars also delivery staff. The motor car which usually Tucker went ended up being damaged nonetheless she or he maintain with an go through on a product that the majority of many people basically dream of.
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