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[CSM] Runaway planets ejected from galaxy at insane speeds - Page 2

post #11 of 98
Its the Reapers! ph34r-smiley.gif


wheee.gif (Too much Mass Effect, haha)
   
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post #12 of 98
Quote:
Originally Posted by Kappy03 View Post

Could using the gravitational pull from celestial bodies be the answer to long distance, high-speed space travel?

We already regularly employ gravitational slingshoting.
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post #13 of 98
Thread Starter 
Quote:
Originally Posted by cbrazeau1115 View Post

Cool article, but no, this is not the answer to space travel...

It's probably not the answer, but could concepts similar to the "slingshot around the moon" concept in the Apollo 13 space mission, be applied to high speed space travel? Like twirling a toy plane around on a string. All that's needed is for something to cut the string for it to go flying of tangent to it's circular motion. Nuclear propulsion perhaps. A nuke shoots off a space craft like it was the bullet inside of a gun barrel. The difference is that the additional velocity of the orbit is added on. Am I somewhere in the ballpark with this explanation?

Addressing the mass debate (no pun intended smile.gif ) : I'm pretty sure mass isn't affected by speed in a vacuum. Mass absorbing energy means it is being accelerated or heated (or reflecting light?). Mass traveling at the speed of light is impossible though because it cannot exist. Time is slower the closer you get to the speed of light and at the speed of light, time equals zero. Mass cannot exist in a "zero" amount of time.

Question: As we all know, it takes 8 minutes for the light of the sun to reach Earth. So, what would happen if the sun instantaneously disappeared? Would the Earth be thrown out of orbit and into deep space BEFORE we saw the light disappear? Or, would we be thrown out into deep space 8 minutes AFTER the sun disappeared? (At the same time we saw the disappear). smile.gif
post #14 of 98
Quote:
Originally Posted by Kappy03 View Post

Question: As we all know, it takes 8 minutes for the light of the sun to reach Earth. So, what would happen if the sun instantaneously disappeared? Would the Earth be thrown out of orbit and into deep space BEFORE we saw the light disappear? Or, would we be thrown out into deep space 8 minutes AFTER the sun disappeared? (At the same time we saw the disappear). smile.gif

My guess is that the missing sun's gravity will be noticed before the missing light. I have no proof/evidence to back that claim up but thats just my guess.
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post #15 of 98
Quote:
Originally Posted by Kappy03 View Post

It's probably not the answer, but could concepts similar to the "slingshot around the moon" concept in the Apollo 13 space mission, be applied to high speed space travel? Like twirling a toy plane around on a string. All that's needed is for something to cut the string for it to go flying of tangent to it's circular motion. Nuclear propulsion perhaps. A nuke shoots off a space craft like it was the bullet inside of a gun barrel. The difference is that the additional velocity of the orbit is added on. Am I somewhere in the ballpark with this explanation?
Addressing the mass debate (no pun intended smile.gif ) : I'm pretty sure mass isn't affected by speed in a vacuum. Mass absorbing energy means it is being accelerated or heated (or reflecting light?). Mass traveling at the speed of light is impossible though because it cannot exist. Time is slower the closer you get to the speed of light and at the speed of light, time equals zero. Mass cannot exist in a "zero" amount of time.
Question: As we all know, it takes 8 minutes for the light of the sun to reach Earth. So, what would happen if the sun instantaneously disappeared? Would the Earth be thrown out of orbit and into deep space BEFORE we saw the light disappear? Or, would we be thrown out into deep space 8 minutes AFTER the sun disappeared? (At the same time we saw the disappear). smile.gif

Yeah the gravitational slingshot can be used pretty well. Although there might be some practical difficulties involved in implementing it with a planet size body at our current tech level. More so when you near the speed of light as random particles in your path which do happen to have a mass will hit you with immense kinetic energy. Photons, which do not have mass, will shift into very high energy levels and you will bathe in X-Rays from the direction you are traveling to while the stuff "behind" you will shift into radio frequencies (bcos of Doppler shift)

Time, btw, is also frame of reference depended quantity in general relativity. If you are sitting on a planet traveling at near light speed "your" time is pretty regular as is your mass. Now for outsize observers, however, seeing you zip past them you would seem to have different time and mass (or more precisely it boils down to an energy and energy density at the end of the day).

The consensus seems to be, that we would feel the "disappearing of sun" approx 8 minutes after it dissapears. We dont know yet the exact properties of the particle causing stuff to have mass, but general assumption is, that it travels at near light speed.

I'm not an expert of general relativity btw so if I have made any mistakes feel free to correct me. The "point" of general relativity for me is to make Newton laws invariant under Lorentz transformation. So its somewhat simplistic and probably a bit naive approach to the theory quite possibly overlooking all the finer effects.
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post #16 of 98
Quote:
Originally Posted by Kappy03 View Post

http://www.csmonitor.com/Science/2012/0323/Runaway-planets-ejected-from-galaxy-at-insane-speeds
Could using the gravitational pull from celestial bodies be the answer to long distance, high-speed space travel?

Nope long distance space travel at the speed of light is still 100's or 1000's of years of traveling. If humans are ever going to do long distance space travel it will be trough warpholes or something like that because at speeds of light it just takes to long to discover the universe.
And since traveling faster then the speed of light according to physics isn't possible i don't see any other way then trough warpholes (if they even exist or possible).
(There are probably some other theories for long distance space travel but i just picked one)
Edited by Stuuut - 3/26/12 at 2:30am
    
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post #17 of 98
Quote:
Originally Posted by Blameless View Post

We already regularly employ gravitational slingshoting.

Yep, that's how we slingshotted Voyager out of the Galaxy wink.gif
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post #18 of 98
Long-distance space travel? You can't get anywhere at mere fractions of light speed. Even AT light speed it would take over 4 years to just to reach our closest neighboring star - and yes, I know that for the traveler the 4 years would seem far shorter (instant if he/she was traveling at light speed) but the people on earth would still be waiting for over a decade till they hear anything back from the traveler. Radio waves are pathetically slow (and weak) and transferring information at light-speed would still take years.

The fact remains that until we discover some kind of a MIRACLE way to completely bypass light's restrictive snail-paced speeds (wormholes or whatever), mankind won't even be able to take a true photo of our own galaxy from the outside. The Milky Way is approx 1K lightyears thick and 100K lightyears wide, our race would have to survive for several millennia to develop such technologies and reach such distances - and for what reason exactly? Pointless tongue.gif
Edited by Tippy - 3/26/12 at 3:04am
post #19 of 98
Quote:
Originally Posted by PappaSmurfsHarem View Post

Since mass increases the closer something gets to light speed. What would the mass of these planets be? confused.gif
Quote:
Originally Posted by FlawleZ View Post

Mass decreases the closer to you get to the speed of light.

I think it can go either way. Isn't light mass-less and if there's more mass, the larger the potential (and kinetic) energy can be stored?
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post #20 of 98
Quote:
Originally Posted by HybridCore View Post

I think it can go either way. Isn't light mass-less and if there's more mass, the larger the potential (and kinetic) energy can be stored?

Kinetic energy is usually mass times velocity squared. Potential is a bit trickier thing and is usually measured relative to something else. In relativistic cases it can be a bit messier but is still pretty straightforward as long as your frame of reference is not accelerating (for example, by spinning around). However, "it can go either way" is not accurate. I have posted explanation few posts back so I will not repeat it here again.

Wikipedia, while not being "scietifically accurate" always and thus should be taken with grain of salt is pretty good place to start with when in doubt, for example http://en.wikipedia.org/wiki/Mass_in_special_relativity

I myself tend to prefer http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html when looking into some physics related stuff which is not my particular field of expertise. Although having some prior education in the area helps when looking up from the second site.
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Crucial M4 64 GB Barracuda 4 TB Sythe big shuriken rev B Windows 7 Pro 64 bit 
MonitorMonitorMonitorMonitor
DELL U2311H (x3) DELL U2312HM (x2) 9.7'' 2048x1536 (x3) IPAD3 retina Asus PB287Q 4K 
KeyboardPowerCaseMouse
CM Quickfire TK (red) Corsair AX-1200i Modded Sharkoon VS-3 Logitech G700s 
Mouse Pad
3M Ergonomic 
CPUMotherboardGraphicsGraphics
Intel Core i7 3820 X79-UP4 Sapphire 7950 FleX OC XFX 6770 Eyefinity 5 
GraphicsRAMHard DriveHard Drive
Club3D 7870 Eyefinity 6 64 GB Samsung 750 GB F3 Barracuda 3 TB 
Hard DriveHard DriveHard DriveHard Drive
WD Green 3 TB Crucial M4 256 GB Crucial M4 64 GB Barracuda 4 TB 
CoolingOSMonitorMonitor
Custom loop Windows 7 Pro 64 bit DELL U2311H (x3) DELL U2312HM (x2) 
MonitorMonitorKeyboardPower
9.7'' 2048x1536 (x3) IPAD3 retina Asus PB287Q 4K CM Quickfire TK (red) Corsair AX-1200i 
CaseMouseMouse Pad
Modded Chieftec Smart WH-02B-B-OB Logitech G700s 3M Ergonomic 
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