how can a vehicle from earth orbit mainly the sun, not the earth, and return?
362481
Yes this would save a lot of fuel. instead of its own engines, a spaceship can use the gravitational pull of the sun or the earth and kepp in orbit. this is how spaceships orbit in the first place. the same thing was done to bring apollo 13 back after it got damaged. it used the moons pull to turn back towards the earth instead of its own rockets. this can take very precise calculation and can also go horribly wrong. if someone were to make the mistake of even a foot in claculating the altitude required to make apollo 13 turn, it could have landed up a few thousand kms away from earth
70887
they can't.  That would be a perpetual motion machine.  \nConservation of energy says that you can't get something for nothing.  for a terrestrial body to do work continuously it would need to be given a continuous supply of energy.\n\nIn an elliptical orbit, two boddies can take turns doing work on each other and energy is conserved.
54730
Not clear what you mean?  How does it stay up in space? It does that because it is going very fast, which would take it away from earth, but gravity is pulling it back, causing it to curve, and go around the earth, just like a string on a yo-yo if you just whip it around your head. \n\nIf you mean, what does it do, there are different kinds, but most of them get power from solar panels, and have radio receivers and transmitters to communicate back to earth.
744587
Hydrogen powered autos is the way to go. The sun's energy can be used to separate Hydrogen from Oxygen, so you definitely have something environmentally friendly.
125609
I will rephrase the question to make sure I understand it correctly.\nWhat I think you're asking is that since the earth is travelling around the sun at thousands of miles an hour, how can a plane keep up with that speed to stay in the earths atmosphere?  \nIt is a very good question.\nI will give you a scenario:\nIf there's a fly inside your car sitting on the dashboard, and the car is travelling at 70 mph, will it crash into the back window as soon as it takes off from the dashboard?  \nThe answer is no because the air inside the car is also travelling at 70 mph, along with everything else inside the car.\nSo, the fly will be operating in the atmosphere inside the car.\nThe same holds true for the plane.  The earth's atmosphere is travelling thousands of miles an hour along with the rest of the earth.  Therefore, the plane is operating inside that atmosphere and will be carried along with it just like the fly in the car.
169193
you can achieve this with centrifugal force. it is called an orbit. the moon is very close to this point it reappears in nearly the same spot about 25 hours later!
194906
Ah.. Get back with us if a few years..... lol\nThen we'll KNOW the answer.\n\nBut I would think #3.  Mount a rocket motor on it. It's got a lot of mass to get moving with the other methods not being, today, that efficient.
25250
I found what you may be looking for at the website below.  Here it is...\n\nFirst it should be known that the Earth's orbit around the Sun is elliptical, not perfectly circular, so the Earth-Sun distance is changing as we speak just from the Earth traveling in its orbit around the Sun.  \n\nIs the orbit itself changing? Well, there are some long-period oscillations, but those are very small, and don't imply that we're systematically moving towards or away from the Sun. \n\nThere is an effect which is making us move very slowly away from the Sun. That is the tidal interaction between the Sun and the Earth. This slows down the rotation of the Sun, and pushes the Earth farther away from the Sun. You can read more about tides, as they relate to the Earth-Moon system. The principle for the Sun-Earth system should be the same. But how big of an effect is this? It turns out that the yearly increase in the distance between the Earth and the Sun from this effect is only about one micrometer (a millionth of a meter, or a ten thousandth of a centimeter). So this is a *very* tiny effect. \n\nThere is another effect which is also small, but somewhat bigger than the tidal effect. The Sun is powered by nuclear fusion, which means the Sun is continuously transforming a small part of its mass into energy. As the mass of the Sun goes down, our orbit gets proportionally bigger. However, over the entire main sequence lifetime of the Sun (about 10 billion years), the Sun will only lose about 0.1% of its mass, which means that the Earth should move out by just ~150,000 km (small compared to the total Earth-Sun distance of ~150,000,000 km). If we assume that the Sun's rate of nuclear fusion today is the same as the average rate over those 10 billion years (a bold assumption, but it should give us a rough idea of the answer), then we're moving away from the Sun at the rate of ~1.5 cm (less than an inch) a year. I probably don't even need to mention that this is so small that we don't have to worry about freezing.\n\n:)\nPeace!
221678
the earth doesnt fly towards the sun cuz there r more than one force acting upon it...theres the gravitational pull the sun has on the earth as well as the fact that the moon wants to remain in motion in the same direction.this applies to newtons 1rd law of motion(his first law is that an object will remain at rest until acted upon by another object or it will remain in motion until acted upon by an object..in other words,its inertia)...since the earth has both a side movement and the gravitational pull from the sun...those 2 forces cause the earth to orbit around the sun and not fly towards it or away from it. if u dont understand this...email me (pulga0888@yahoo.com) and ill try to explain it better..........now for ur second question...wat makes the earth spin...the earth spins because of the rotation of the magna and stuff in the earths core..well in the convection zone...im pretty sure thats the answer to the second question but im not positive...if u want me to check then email me.
430311
Why don't we just fly the planet into the sun?
200970
The sun is 93 million miles from Earth on the average, since the Earth does have a slightly elliptical orbit. How long it takes to get there is kind of an incomplete question because it all depends what you want to do when you get there.\n\nIt wouldn't take long for a spacecraft to fly straight to the sun and either fall into it or zoom by and then off into space, but if you wan to launch a probe to study the sun you have to be more clever.  \n\nThe link below is information on the Ulysses probe sent out in 1990. Ulysses actually did something of a "bank shot" off of Jupiter in order to get into an orbit where it goes around the sun over its poles rather than around the middle, which is rather cool that it worked so well.  Imagine playing billiards on a table three miles long and two wide and sinking the eight in a corner pocket after banking off of two cushions -- and then multiply that by a million, and you have a good idea how difficult this stuff is.
284291
If you could shoot a rocket into outer space with enough force to cause it to leave our solar system, perhaps it would exhibit "perpetual motion" and travel forever.  But that would be deceptive.  It would continue to move unchanged only because it meets little matter or force to overcome.  On earth, to set something into motion you must add to its kinetic energy which equals one half times its mass times its velocity squared.  It doesn't matter how you add the energy (or that it gains more say by falling) we are interested only in the energy you added to create perpetual motion.  It could revolve say suspended above powerful frictionless magnets within the vacuum inside an evacuated bell jar for a very long time.  However, there is no perfect vacuum on earth and there would still be atoms or molecules that would collide with and slow down the rotating item whether that took hours or days or years.  Perpetual motion must last forever(!) without you or Nature adding to its original kinetic energy.  If you hold your hand outside a moving car you will feel wind on your hand and some reasoon it could be harnessed (like a sail boat) to propel the car, neglecting the fact that the wind exists solely because the car is burning fuel.  Out of gas = out of wind.\n\nI would encourage you to pursue your theory for the lessons involved but carefully account for all the energy.  Consult with any engineer (especially mechanical at first) or any physics teacher (professor) and remember that your theory could involve a better use of energy if not perpetual motion.  You must patent most devices within a year of public disclosure (which would not include a witness to your theory or device).  Good luck.
584363
The laws of physics say that an object in motoin will remain in motion unless acted upon by an outside force.  It's hard to conceive of anything that would make Earth's core stop spinning short of some planet destroying catastrophe.
56922
To be very precise, this is what happens:\n\nAs we are attracted towards the sun by the force of sun's gravity, we continously experience a constantly increasing force, beacuse of the inverse-square law.\nAnd due to this, our momentum is continously increasing.This increase in the momentum causes a centripetal and a centrefugal force on th earth, which results into a hellical orbit.But due the inverse-square relationships, the horizontal component of the helix is nullified as soon as the earth achieves its stability, so it revolves around the sun, without crashing into it.\nAt this point, all of sun's gravitational pull equates mv^2/r, which in tuen accounts for all the centripetal force of the earth.SO, THEREFORE, NO EXCESS FORCE PULLS THE EARTH FURTHER TOWARDS THE SUN, SINCE ALL OF THE FORCE IS EXPENDED IN MAKING IT REVOLVE.
78972
Very large rockets produce enough thrust to overcome the Earth's gravity. Eventually, they go so high up, that even with the rockets turned off, the Earth's gravity no longer pulls it back down.  Everytime you jump up, you're essentially 'leaving' the Earth's gravity, so think of it as 'jumping' with so much force that you keep going right into space.  Sorry for the watered-down explanation. You could probably get a more scientific responce by typing 'rocket propulsion' into a search engine.
668189
Nobody has found any evidence for a form of gravity the repels instead of attracting, but that doesn't keep people from looking for it. It may yet be found. But such a force is not needed to explain orbital motion. In fact, it would disrupt orbits, causing the Earth to fly away from the Sun and never return.
746784
The orbital plane has planets slinging out from the middle of a rotating sun, as the rings of Saturn do around its middle, because of a flow that is slung out from the rotating body that thence returns into the rotating body at the poles. The planets in the orbital plane slung out from the middle of the sun are thus held away by this sling. \n\nPlanets do not flow with the sling round to the poles of the sun, because this would involve a trip too far away from the sun, a gravitational giant, before the trip back. The gravitational draw here can be envisioned as a string from the center of the sun to the planet. \n\nPlanets move, in concert, in a clockwise or counterclockwise direction around a sun due to sweeping arms that reach out from the core of the rotating sun, brushing the planets before them. These sweeping arms can be envisioned as the spokes of a wheel. \n\nPlanets stay in the orbital plane and do not drift to either side because of what we will refer to as eddy currents. The sling out is not solely at the waist of the rotating sun but slings out at a diminishing rate on either side, but the rate outward is greater at the waist. Thus, when the material being slung out from the middle of the rotating sun tries to escape to the sides, it is caught and pulled back by the slower pace of the material at the sides, creating a circular eddy current that returns it to the waist of the rotating sun. This eddy current can be envisioned as flotsam on a river and the manner in which this gets drawn into the center of the river, where the fastest flow occurs. \n\nPlanets find their niche in all this based on more than gravity or magnetism factors, as there are thousands of forces that affect the placement of bodies free to move about in space. The entry of a new planet into the orbital plane would results in a bumping outward or compressing inward of existing planets as this new planet encountered the others during their journeys around the sun, until no further adjustments were required and an equilibrium was established.