#122840 - 04/26/07 11:31 PM
Re: Fun Science Factoid Of The Day
[Re: Bravus]
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Husband and Father
Registered: 09/05/04
Posts: 7061
Loc: Brisbane, Australia
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Certain Chinese and American alligators can survive the winter by freezing their heads in ice, leaving their nose out to breath for months on end.
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#122845 - 04/26/07 11:41 PM
Re: Fun Science Factoid Of The Day
[Re: D. Allan]
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I have many points...
Registered: 12/10/02
Posts: 13579
Loc: Buon giorno, Principessa
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I've really goofed. I asked Bevin to host a thread on Astronomy and then here I asked Bravus a question about the stars! Sorry Bevin. And if that was not a big enough goof I also forgot to inform Bravus about the new thread, Stars are God's Fireworks! I'm sorry, Bravus.
I apologize ... to Bevin, Bravus and everybody. It's just all part of the fun :)
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Gail gail@adventistforum.comAnd the work of righteousness shall be peace; and the effect of righteousness quietness and assurance for ever. Isaiah 32:17
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#122846 - 04/26/07 11:42 PM
Re: Fun Science Factoid Of The Day
[Re: Gail]
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Husband and Father
Registered: 09/05/04
Posts: 7061
Loc: Brisbane, Australia
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Yeah, no worries at all... and we seem to both be happy commenting on each other's threads anyway. I suspect us geeks are just happy to have someone to talk to about the awesomeness of creation.
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#122857 - 04/27/07 12:45 AM
Re: Fun Science Factoid Of The Day
[Re: D. Allan]
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Registered: 09/04/02
Posts: 4699
Loc: New England
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No apology needed about the cross-fertilization!
Why don't these alligators and crocodiles get frost-bite?
/Bevin
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#122858 - 04/27/07 12:49 AM
Re: Fun Science Factoid Of The Day
[Re: bevin]
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Husband and Father
Registered: 09/05/04
Posts: 7061
Loc: Brisbane, Australia
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Dunno - coldbloodedness?
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#122992 - 04/27/07 11:27 PM
Re: Fun Science Factoid Of The Day
[Re: Bravus]
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Husband and Father
Registered: 09/05/04
Posts: 7061
Loc: Brisbane, Australia
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The space shuttle has three rocket engines in the back, but there's absolutely no room inside for all the fuel it needs to launch itself up into space. All of that fuel is stored outside the shuttle, in the big brown cylinder, called the external tank.
The tank containing all the rocket fuel weighs seven times more than the space shuttle itself! That's a lot of really heavy fuel, and the space shuttle engines aren't quite strong enough to push the combined weight of the shuttle and the big bloated external tank up off the ground.
That's what the two long white solid rocket boosters strapped onto the sides of the external tank are for. They lift the tank! Fortunately, it was not necessary to strap an infinite series of smaller and smaller rockets to the sides of the solid rocket boosters.From: http://www.coolsciencefacts.com/
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#122994 - 04/27/07 11:57 PM
Re: Fun Science Factoid Of The Day
[Re: Bravus]
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Registered: 09/04/02
Posts: 4699
Loc: New England
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Cool related factoid The solid fuel motors have a hole right up the middle, and they burn the entire length of this hole, not just at the bottom end. The fuel itself provides the protection for the surrounding casing during most of the burn... By changing the shape of the hole, you can change the thrust-over-time curve of the burning rocket. A cylinder has the least surface area initially and, as it burns wider, the thrust grows. A star-shaped hole is often used - you can get almost constant thrust out of that... http://en.wikipedia.org/wiki/Space_Shuttle_Solid_Rocket_BoosterThe propellant is an 11-point star-shaped perforation in the forward motor segment and a double-truncated-cone perforation in each of the aft segments and aft closure. This configuration provides high thrust at ignition and then reduces the thrust by approximately a third 50 seconds after lift-off to avoid overstressing the vehicle during maximum dynamic pressure.
/Bevin
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#122996 - 04/28/07 12:03 AM
Re: Fun Science Factoid Of The Day
[Re: bevin]
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Husband and Father
Registered: 09/05/04
Posts: 7061
Loc: Brisbane, Australia
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That is cool - it seems in some ways a low-tech solution to a high-tech problem, in a good way.
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