In vaccume ie in space no atmosphere present, there is no friction, still rockets move forward how???
344866
this isn't a question about astronomy.\n\nhttp://en.wikipedia.org/wiki/Astronomy\n\nit is newton's third law.  for every action there is an equal and opposite reaction.  the burning fuel converts to exhaust gasses and increases in volume so it escapes from the combustion chamber under great pressure.  the exhaust gasses are focused into moving in one direction creating a force in that direction.  the rocket creates a force in the opposite direction so the rocket accelerates in that direction.
25248
First of all, there is no fixed end to the atmosphere: it gradually fades away to the density of interplanetary space.  However, the effective "top" of the atmosphere is often taken to be 60 miles (100 km), the altitude at which a (typical) unpowered satellite could make one orbit before air drag slowed it and caused it to fall.\nTo reach this altitude only requires that an object be headed upward, no matter how slowly.  To move upward requires that the object have some force propeling it which is at least slightly greater than the force of gravity pulling it down.  This force of gravity lessens with altitude, which is why a rocket needs a lot of power to take off, but little to maneuver in orbit.  Thus there is no minimum speed needed to reach the "top" of the atmosphere.\nHowever, the orbital velocity needed to stay in orbit is that velocity which just equals the downward pull of gravity, so orbital speed depends on the altitude of the satellite: it goes down with altitude.  (For example, at a typical low-orbit altitude of a couple hundred miles or so, the speed is around 17,000 miles per hour and the orbital period for one orbit is around an hour and a half; the Moon, 238,000 miles away, moves about 2000 mph and takes 28 days to orbit once. For mathematical details, see references on Kepler's Laws.
861922
It is not a vacuum.  The density of space is 0.1 - 1000 atoms/cm3.\n\nPlanets are made of condensed interstellar matter.
1137612
Empty space itself cannot have a temperature, unless you mean some\nabstruse question about quantum vacuums.\n\nHowever, if you put a physical object into space, it will reach a\ntemperature that depends on how efficiently it absorbs and emits\nradiation and on what heating sources are nearby.  For example, an\nobject that both absorbs and emits perfectly, put at the Earth's\ndistance from the Sun, will reach a temperature of about 280 K or 7 C.\nIf it is shielded from the Sun but exposed to interplanetary and\ninterstellar radiation, it reaches about 5 K.  If it were far from all\nstars and galaxies, it would come into equilibrium with the microwave\nbackground at about 2.7 K.\n\nSpacecraft (and spacewalking astronauts) often run a bit hotter than\n280 K because they generate internal energy.  Arranging for them to\nrun at the desired temperature is an important aspect of design.\n\nSome people also consider the "temperature" of high energy particles\nlike the solar wind or cosmic rays or the outer parts of the Earth's\natmosphere.  These particles are not in thermal equilibrium, so it's\nnot correct to speak of a single temperature for them, but their\nenergies correspond to temperatures of thousands of kelvins or higher.\nGenerally speaking, these particles are too tenuous to affect the\ntemperature of macroscopic objects.  There simply aren't enough\nparticles around to transfer much energy.  (It's the same on the\nground.  There are cosmic rays going through your body all the time,\nbut there aren't enough to keep you warm if the air is cold.  The air\nat the Earth's surface is dense enough to transfer plenty of heat to\nor from your body.)
912321
Are you sure those are really rockets?  There are not that many launched, you know, and the tend to go up quite quickly so unless you are down range from a rocket launch pad, you probably never seen a rocket.\n\nI tend to have a hunch that what you are talking about can be contrails from high altitude airliners.  If this is so, and then they can be in all directions (while rockets are essentially launched towards the east to get an extra nude from the earth's rotation) this is not smoke, it is just the engine exhaust, a mix of carbon dioxide and water vapor from the combustion of hydrocarbon fuel, that cools in the very chilly air at those altitude (10000 m and above).  The ice crystals form and look just like a cloud that can dissipate at varying rate depending on how humid it is up there.
387100
It relies on the principle of conservation of momentum. When you consider the rocket and the propellant inside it as one system, there are no external forces acting on this system, so the momentum of this entire system must be conserved. Now, rockets exhaust propellant. This gives the propellant velocity in the backward direction, so something must go forward to keep the total momentum the same. What is that something? It's the rocket.
306454
air would rush into the empty tube and filll the vaccum and some may escape in to space but not very much.\n\nTake a straw and plug the top insert it into a glass of water - remove your finger. if your straw wa almost all the way under you will shoot a little water in the air but the cupp will not empty - physical principles are the same
1097658
"Space air"?\nIt is really hard to decipher what you are trying to ask.\n\n"Space" is pretty close to being a vacuum (for all intensive purposes for us here on Earth), thus there is no "air" in space.\n\nThe concept of there being some type of medium in space which everything travels through (the idea of an "aether", the material which allowed light to propigate through empty space) has since been disproven over well 100 years ago by the Michelson-Morley experiment.
462904
Here's how it works:\n\nThe air and water serve two different functions - the air is what is compressed, and pushes the water out of the back end of the rocket.  The water, although basically incompressible, is what makes the rocket go.  Momentum is always conserved, so whatever momentum (mass times speed) the water gets going out the back is also imparted to the rocket in the opposite direction.  You can think of it as positive and negative added momentum, creating a net change of zero.  The rocket is usually a much lower mass than the water, so the speed it achieves in order to match the momentum is higher than that of the water.\n\nAfter the water and air are expelled from the rocket, gravity is the only remaining force; the rocket slows, reverses direction, and lands on the ground.
1096154
use a pop bottle quarter fill wth water, and seal with a rubber cork(one with a hole in the middle this is where you put your compressor attachment)  add fins to your bottle just like a real rocket\n\nuse a half pipe as a ramp and angle it a 45 degrees ataach the compressor to the bottle and turn on.  when the air pressure gets high enough the cork will shoot out and the rocket will fly.  try different amounts of water and change the angle
1002624
Well actually on thing first: the reason why on a spacecraft or in a spacestation air is sucked out into space, is because gas as being air rises and fills as much room as it can expand, but as space is empty it will try to consume that space. This gets vacuum mixed up with air/gas escaping.\nSo nebulas, dust, gas and other remnants can stay in one place. Although the gas expands and converts dark matter to a larger mass (process=0.000023% conversion). As also the mass expands, the same way as galaxies expand the universe like the particles of the nova gas.\nIf a spaceship or spacestation was to explode it would be a flash of light expanding on the particles that were ejected by the explosive expansion, feeding on the explosion power. Basically the explosion would push out the mass rather than the mass expanding on itself. The term of explosion in space is not yet literally confirmed but some people name it a "nova". Although it means "explosion of gas from gas cloud" to our sense. There may not be air but the dark matter would provide a vibe cushion. Although a smaller sound it will still be a "sound" that probably only certain ears can hear as well as the energy production would create a certain spectrum of sound.\nOnly man-made satellites have been broken and fallen to Earth, but I don't know of any explosions, actually they're 50% explosion proof I think.\nAlso think as if you're in a spaceship and you are travelling at 100 mph all heavier loose matter will be forced down by gravity and weight as liquid and gas and air as heavy loose matter to be heavy and travelling will cause these heavier loose matter to be forced into your face as you are gaining speed this is a vacuum of force "forced matter vacuum". With the door wide open while travelling will cause a pump or "matter pump vacuum". Making loose heavy matter to be forced to the bottom in gravity and backwards by force vacuum "also 'gravitional vacuum' ". This is called the "circulation vacuum". Like liquid you would see heavier elements go to the base and the lightest at the top this is the same physic as that of forcing heavier loose matter back in a spaceship as "circulation vacuum". This force is relative to gravity "relativity".
191108
Definitely Vacuum. Because space, that is vacuum space has no mass. Because of that factor, WE, can basically, "FLY" in outer space....
174378
It does, and at the same time, it doesnt, it depends on the situation.\n\nIf you were to take a rocket out so far away from any gravitaitonal fields that they were insignificant and remove any of type of friction/forces acting on the space craft, then it wouldnt need a rocket to continue moving due to Newtons 1st law of motion (inertia).\n\nHowever, in any real, practical, situation, a space craft does need a rocket to keep moving, eventually.\nTake this example.  If you had a space craft in space at the edge of the Earth's atmosphere so that air resistance was negliglible and fire the rockets off initially to start moving but then shut them down.....eventually, then rocket would come to a stop.  This would happen because of Earth's gravitational pull on the rocket, just because something is in space doesnt mean there is no gravity. Gravity acts as the unbalanced force to slow/stop/reverse the space craft, if the rockets arent fired to counter act this, the craft will eventually fall back to Earth.\nThere is a special case to this example, however.  If the space craft were to originally lauch at the escape velocity for Earth, it would never fall back down as that is defined as the minimum velocity needed to escape the Earth's gravitaitonal pull forever, bu this still isnt to say that the craft wont slow down as Earth continues to exert a force on it.\n\nIn space, as with everywhere else in the universe, an object will only maintain a constant velocity if the net force acting on the object is zero.  If there is any force acting on the object (be it due to gravity, friction, whatever), there will be some acceleration which will cause a change in velocity with respect to time.
332802
Actually, There is no such thing as a true vacuum...period!\n(exerpt from a previous answer)\nContrary to popular belief, empty space is not empty, and it is certainly not a vacuum. In fact, a true vacuum has never been created, anywhere, where the atomic count and therefore air pressure is zero.\nresearch it, its true.\n"Empty" space actually contains an average of 1 hydrogen atom for every 32 cubic centimeters of space, this data is per NASA.\n\nIn our own Milky Way, space is more dense with 1 hydrogen atom for every 1 cubic centimeter.\n\nOne day the misinformation of space as a vacuum will finally die out.\n\n\nspread the knowledge
673324
The motion of rockets can be explained using Newton's 3rd Law of Motion or by considering Conservation of Momentum.  (The explainations are just two ways of looking at the same thing.)\n\nNewton's 3rd Law says if object A pushes on object B, object B pushes back on object A just as hard but in the opposite direction.  Technically, as rocket fuel is burned, it is "pushed" out backward by the rocket.  The fuel then pushes forward on the rocket just as hard, making the rocket move.\n\nMomentum is the product of mass and velocity (speed and direction.)  If a rocket plus its fuel is sitting still in space, the total momentum is zero (because there is no motion).  When the fuel burns and is ejected backwards, it gains a backward momentum.  To conserve momentum (keep it equal to zero), there must also be a forward moment.  This is provided by the rocket.
719839
in the shuttle? absorbed and filtered. Their is still humidity but under control.\n\nIn the outer space there isn't any  just on rocks(asteroid)
1016707
there is friction in space as said before but it is also because there is matter in space, just not very much, and eventually it would cause the object to stpo spinning