Archive for October, 2009

October 29th, 2009

Craig the Rocket Scientist, Ben Affleck and the Ares 1-X

Craig the Rocket Scientist
by Craig the Rocket Scientist,
View all posts by Craig the Rocket Scientist

Greatest movie in the world?  Armageddon.

Want proof? Lots of stuff blows up, protesters get pelted with golf balls, and Ben Affleck screams like a girl while getting shot at… by Bruce Willis!!!

But to top it off NASA is able to launch not 1, but 2(!!!) suped up space shuttles… on time. Honestly, I don’t remember the last time NASA was able to launch ANYTHING on time.

Take for example the Ares 1-X launch that was supposed to happen on Tuesday.  Due to Triboelectric concerns they scrubbed it! Are you serious?! The thing isn’t even a prototype and you ca… Wait, you do know what Ares 1-X is right? Most news sources are calling the 1-X NASA’s “new rocket.” Others, slightly more correct, are calling it a test rocket. I apologize, but we’re about to get very, very rocket sciency.

So What is Ares 1-X?

It’s not an actual Ares rocket, arguably it’s not even a prototype. Ares 1-X could accurately be described as a technology demonstrator, a proof of concept if you will. Strip away the hype and 1-X is an 8 year old 4- segment RSRM (Reusable Solid Rocket Motor) with a dummy fifth segment. On top of that, it is essentially a hollow structure designed to have the same profile as a real Ares rocket.

So if This Rocket Really Isn’t Representative of Ares1, Why are We Spending the Money to Launch it?

Because NASA is smart. Smart enough to know that they don’t have enough experience with a rocket configured like this to skip straight to building a final product.

Ares 1-X goals are to demonstrate and collect data on:

  • Integration, assembly, and launch operations
  • Roll and control of the vehicle
  • Stage separation
  • Aerodynamic, thermal, and vehicle loads
  • Re-entry dynamics and recovery

All of this data will be compiled, analyzed and integrated into the final Ares1 design and ultimately help produce a better, safer, final product. Since the “solid rocket motor first stage” is the only “live” stage, obviously that is where the bulk of the data gathering has to take place. So… how does it work?

diagram
As you can see in this graphic from the NASA Fact Sheet after about 2 minutes the first stage burned out and separated from the simulated upper stage. The first stage is put into a spin (to help avoid hitting the second stage) and parachutes will deploy so the first stage can be recovered. Sadly everything else has a 1-way ticket to the bottom of the ocean.

This is a pretty huge accomplishment for the Ares program. Congratulations to all involved on a successful launch. And while some might not get the appeal of a test rocket, for a Rocket Scientist this is very, very cool.

Though not as cool as this: (I recommend starting about 55 seconds in. You’ll thank me later.)

(Click here to watch the video on YouTube)

October 26th, 2009

Monday Link Review

Neil Schulman
by Neil Schulman, Editor Emeritus
View all posts by Neil Schulman

Welcome to the final October edition of the Monday Link Review.  As we gear up for Halloween and put the finishing touches on our costumes, we have for you just a few links to help get you through your Monday. Enjoy!

NC State Engineers have created a material that can hold 1TB of data on a fingernail sized chip. 1 Terabyte!

Now, I know that it’s possible to teach horses to count by stomping their hooves… but did you know it was possible to teach bacteria to count?

The Curious Cat Engineering Blog posted a very cool video from Volkswagon Engineering’s “Fun Theory Project” where they discovered an interesting way to convince people to take the stairs instead of the escalator.

And finally, since Knovel is based in New York, what better way to celebrate the upcoming World Series than by taking a look at the building of the brand new Yankee Stadium.

October 22nd, 2009

Craig The Rocket Scientist vs The Conspiracy Theorists

Craig the Rocket Scientist
by Craig the Rocket Scientist,
View all posts by Craig the Rocket Scientist

A few days ago, my editor informed me that my post on the LCROSS lunar impact had given rise to a discussion on Facebook. Sadly, it seems there are a few of you who don’t believe we actually landed on the moon. This has long been a pet peeve of mine since there is an abundance of evidence proving we DID land on the moon.

I’ve tried to gather up all the misconceptions and wrong information and address them individually. Because these sorts of things can degenerate into name-calling and hand-waving I’m going to set a few ground rules.

  1. No name calling, threats or belittling
  2. I will use only facts supported by evidence (otherwise they aren’t really facts)
  3. Any referenced websites will be mainstream and reputable

I encourage any and all to respond, no matter your position, and I’ll happily correct any other misconceptions you may have. I only request that you follow the same guidelines above. If we can’t play nice we won’t play at all.



Point 1: If we landed on the moon, why doesn’t NASA use one of its fancy telescopes, which are so powerful they can see other galaxies, to take pictures of the stuff we left?

NASA currently has 4 large observatories, Compton, Spitzer, Chandra, and Hubble. (You can see NASA’s webpage dedicated to them here.) They work together and each “sees” different parts of the light spectrum:90950main_Observatories

Compton= gamma rays
Spitzer = Infrared/thermal
Chandra = X-rays
Hubble = Visible/UV

So really, only one of the 4 four can actually see the landing site: The Hubble. However, the moon is so close that it can’t resolve the images very well: The Dawes Limit states that an image 380,000 kilometers away would need a 100 meter mirror to see an object several meters long accurately. Currently the Hubble can resolve to approximately 60 meters per pixel.

Additionally the moon is moving so quickly that a platform designed to be ultra-stable has trouble tracking it. The Hubble literally has to hold still and wait for the moon to pass in front of it and get of a well timed snapshot. Here is the best Hubble picture of the moon I could find.

Of course, a smaller satellite much closer to the moon would have no trouble seeing the landing sites right? Right! Luckily NASA decided to point the Lunar Reconnaissance Orbiter (LRO) at the old Apollo sites and *GASP!* took pictures of them! For those wanting photographic proof check out NASA’s page of landing site pictures.

For those not wanting to chase the link, here’s a picture courtesy of discovermagazine showing one of the sites and analyzing the picture. For the full article, go here.

369228main_ap14labeled_540


Point 2: The Van Allen radiation belts would kill any would be moon walkers that tried to pass through them.

This is a simple case of incomplete information.

The skinny of it is that the radiation levels fluxuate, but they really aren’t all that high. The average level is low enough to be mostly dissipated by a spacecrafts skin. What little that did reach the astronauts couldn’t do much since they were traveling through them so quickly (several kilometers per second.) In the end, the astronauts were exposed to about as much radiation as they would experience getting a full body x-ray. For a more detailed explanation (plus documentation) of why the Van Allen radiation belt killing any would be moon walkers is false, visit: http://www.wwheaton.com/waw/mad/mad19.html


Point 3: The Lunar Lander Couldn’t Even Fit in the Saturn V

lunar-landerThe lunar lander was approx. 31 feet in diameter and 23 feet tall when deployed. When it was folded up for launch it was only 14 feet in diameter. (If you don’t believe me you can go to the National Air & Space museum and measure theirs)

The upper area of the third stage of the Saturn 5 rocket where it was stored was approx. 21 feet in diameter and 57 feet high. Seems like plenty of room to me! Better yet, here’s a picture of it inside the Saturn 5 payload stage!

And here’s a nice diagram from of the Air and Space Museum showing how the module fit into the Saturn 5:

Fig19a

Now… where was I? OH YES!


llrvPoint 4: The lunar lander was uncontrollable almost killing an astronaut during Earth-bound test flights.

This person has their facts just a little mixed up. The Lunar Lander was designed to operate in lunar gravity, and never flew here on earth. (There were plenty of tests done, but never any “free flights”). What the poster was thinking of was the LLRV, which nearly killed Neil Armstrong, who was able to eject in time. Click here to read more about this (in my opinion) fascinating machine.


Point 5: NASA searching for water on the moon now is evidence they never went in the first place.

landing locations

This is another case of not quite knowing all the facts.

All of our moon landings were roughly equatorial: those areas were the smoothest landing spots they could find and were the simplest to get to. Polar locations, like what LCROSS was observing, are highly cratered and were deemed too dangerous for a landing. (Most of the landings were off by 5-15 miles FYI).

While these equatorial points did provide great spots to land, their constant exposure to the sun also meant they were barren of water. These polar craters, however, shield spots of the regolith from the sun and were thought (correctly) to possibly contain both surface and subsurface water ice.  That’s why we were exploring there. (For a high-res version of this image click here.)


In Conclusion:

I apologize that this was such a long post, but an accusation take only one sentence while proving that accusation false can take volumes. Feel free to throw any other theories trying to prove why we didn’t go, I’d love to refute them all.

*All images not credited were via NASA website

[Ed Note: Craig got so many follow up questions from this one, we decided to post a second entry where he answered some of the more popular questions about the moon landing.]

CONTINUE TO PART II