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25 Comments
- agulesin, on 11/02/2009, -1/+34(Please can you change the title to "Ares 1-X Rocket Lifts Off")
Explanation: Last week, NASA test fired a new rocket. The Ares 1-X was the first non-shuttle rocket launched from Kennedy Space Center since the Saturn launched humans to Earth orbit and the Moon in the 1960s and 1970s. NASA is testing Ares as a prelude to replacing the aging space shuttle fleet.
Please be careful when Digging APOD (or anything!) it helps those searching Digg for interesting things... - pegothejerk, on 11/02/2009, -2/+20I bet the dewey decimal system thrilled you as a youngster.
- Slapyo, on 11/02/2009, -2/+13Submitted on 29th.
http://digg.com/space/Photo_Captures_Ares_I_X_s_Be ... - majordanger, on 11/02/2009, -0/+8"The tremendous thrust of the Ares 1-X can bring the massive rocket from a standing start to a vertical speed of over 100 kilometers per hour in under eight seconds. "
ZERO to 60 MPH in 8 seconds doesn't sound impressive until you think about how much this critter weighs and the fact it's straight up. - lennybird, on 11/02/2009, -0/+7Also check out http://www.boston.com/bigpicture/2009/10/launch_of ...
- Mujokan, on 11/02/2009, -0/+5The actual explanation is really hard to understand unless you do math (I don't). It involves a "singularity" in the equation for the change in air pressure (not a literal singularity when it's implemented in real life, just approaching one).
It's something you get just around the point where you cross the speed of sound (not exactly at that point). There's a cone-shaped shock wave caused as the rocket forces its way through the air. At the start of the shock wave, the air is compressed to the point where it can't be squashed any further. Then, a little later in the shock wave, the air pressure suddenly "snaps back" and there is a big drop in pressure. At this point the water in the air condenses into droplets, which causes the cloud that travels along with the rocket. Then the air returns to normal pressure and the droplets disappear.
There is a Digger called vroom101 who loves this stuff, and he often posts this link: http://web.archive.org/web/20070510225616/www.flui ... - milkmage, on 11/02/2009, -0/+5the S is for super, the U is for Unique, the P is for Perfection, because you know that we are freaks....
- RealmDown, on 11/02/2009, -1/+5New wallpaper for this week. :)
- appleseed1234, on 11/02/2009, -0/+4Too bad NASA doesn't have a gigantic lobby, let's hope this impresses Congress anyway.
- m3dos, on 11/02/2009, -0/+3It says the water vapor cloud is produced by a DROP in pressure, but wouldn't that be the place where the air pressure is greatest?
(just asking) - AlyxVance, on 11/02/2009, -0/+3An increase in velocity creates a decrease in pressure. When air travels over the top of an airplane wing, it has a longer distance to travel because of the hump. This causes a lower air pressure on the top creating lift.
My guess is that since the air has to move move around the top of the rocket at high speeds, it's a similar situation.
EDIT: I'm wrong, it has to do with the shockwave created by supersonic speeds.
http://en.wikipedia.org/wiki/Prandtl-Glauert_singu ... - Awwzm, on 11/02/2009, -1/+4Nice Prandtl–Glauert singularity
- zionoe, on 11/02/2009, -1/+4Rocket is looking Awesome ...
- Awwzm, on 11/02/2009, -1/+3Supersonic!
- sHockz, on 11/02/2009, -2/+4warp speed activated!
- joot2112, on 11/02/2009, -1/+3Check out the previous APOD. The Digg comment box is about the same color as "Cosmic Latte".
- Mawds, on 11/02/2009, -0/+2I like to dream yes, yes, right between my sound machine
- davidlick, on 11/02/2009, -0/+2God I miss Toonami...
- piieerrrree, on 11/02/2009, -0/+2dugg for absolute geekiness
- DrummerAndrew, on 11/03/2009, -0/+2I went through that thought process too. Assuming something like a Lamborghini could be tethered to a wall and drive straight up, how long would it take to get from 0-60? Now what if it weighed 10,000 times as much?
- Awwzm, on 11/02/2009, -0/+1http://en.wikipedia.org/wiki/Prandtl%E2%80%93Glaue ...
- Awwzm, on 11/02/2009, -0/+1the E is for exotic and the R is for raps...
so tell those nosy people just to stay the hell back! - Enkairi, on 11/02/2009, -2/+2Makes me think of this. http://www.youtube.com/watch?v=GRtSNyXzWzs
- ihavefrowned, on 11/03/2009, -0/+0How young do you have to be to not know about the dewey decimal system?
- agulesin, on 11/02/2009, -7/+4Never heard of it but nice to learn about it! Thanks Pal :-))
(for those lazier than me: http://en.wikipedia.org/wiki/Dewey_Decimal_Classif ...
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