If we have spacecraft, capable of accelerate 3G for unlimited time, how long it take to reach near speed of?
917979
Albert said it, you can't get there from here. Let's assume you have the infinite power source you will need to push the near infinite relativistic mass you have as you approach the speed of light and you are deep space with no air friction or other forces to worry about, in other words, the ideal (but impossible) case.\n\nVelocity is acceleration times time. Light travels at 186000 miles per second.  One Gravity is 32 feet per second squared. So, we work backwards from the desired velocity and doing unit conversion from miles to feet . 186000=96/5280*T\nThe answer is 186000*5280/96 which is 10,230,000 seconds, which at 86400 seconds per day means 118.4 days.\n\nWhich does not sound nearly long enough...
491273
Right now, we're not even close to faster-than-light (or FTL) travel.  All out traveling has to be done at less than the speed of light, so most stars are farther away than we can get to.  Even at half the speed of light (which is far faster than we can travel) it would take 8 years to reach the nearest star, not counting the Sun.  (Not to mention 8 more years to get home afterward!)  Nothing can move faster than the speed of light, so our best hope is to do just like they do on Star-Trek.  The found a way to bend spacetime to get to distant stars without actually moving through normal space, which had less of a curve.  Nobody has any idea how to do that now, so we just have to keep expanding our understanding of science until we do.  Until then, I think our best bet on meeting intelligent extraterrestrial life is to hope for them to come to us!
289819
Not a satellite, since that's something that is in an established orbit, but a space probe, yes.  There's one on the way at the moment.  At full speed, it'll be the fastest traveling manmade object ever, but even at that sort of speed it'll take nine years to get there.
1150147
We have already produced a workable system to travel through space economically. Its called an ion drive. It takes some time to get going but once it starts it keeps accelerating because there is little or no mass in space to stop it. Using the Earths gravity to help slingshot us into space would reduce this time...once we have reached a decent velocity ion drive could then take over.An ion drive was recently used in a small craft to take pictures of a large asteroid in our solar system. It worked just as it was theorized.
265616
The two key elements in this question are that the speed of the spacecraft is constant, and that you are at rest relative to the spacecraft.  In this situation, you will observe the beam of light moving forward and hitting the object just the same as if you were sitting in your living room.  This is in accordance with Einstein's Special Theory of Relativity.\n\nHowever, if the spacecraft were accelerating instead of moving at a constant speed, the same might not be true. As long as the spacecraft continues to accelerate, even at speeds below the speed of light, it is possible to set up a scenario in which the spaceship stays ahead of the beam of light forever!  This is in accordance with Einstein's General Theory of Relativity, which considers the effects of acceleration and gravity on light.
454473
Depends on how fast your going.  It's 794 million miles away!  So divide that by how fast you want to go and you'll know.
911033
No.  Nothing goes faster than the speed of light.
1079436
Credit, yay! You need to travel the speed of infinity plus one. That's what this 5 year old next to me said anyway.
685470
the speed = distance/time
958242
Taking the milky-way galaxy to be approx 100 000 ly across, and travelling at a realistic speed of 5 000 km/h, it would take just under 200 000 billion earth years to traverse the galaxy end to end.
146292
11.2 km/s with the following caveats:\n\n"Due to the atmosphere it is not useful and hardly possible to give an object near the surface of the Earth a speed of 11.2 km/s, as these speeds are too far in the hypersonic regime for most practical propulsion systems and would cause most objects to burn up due to atmospheric friction. For an actual escape orbit a spacecraft is first placed in low Earth orbit and then accelerated to the escape velocity at that altitude, which is a little less, ca. 10.9 km/s. The required extra velocity, however, is less because the spacecraft has already been accelerated to about 8 km/s."
407005
I'd say 17000-19000 miles per hour.\n\nIts at a inclined geo-stationary orbit probably.
339821
93 million miles .. a few light seconds
864791
A.) 3.02891 seconds\nB.) 290.1 m/s\n\nTrust me... =)
832530
Here are the facts.\n\n1. The closest Galaxy is the Canis Major Dwarf galaxy\n2. The Canis Major Dwarf galaxy is 42,000 light years away.\n3. Traveling in a conventional space craft would take   \n    approx   4,927,184,640,000 years at 50,000 mi/hour\n4. Using light sails (a cutting edge untested technology)\n    a craft could travel as fast as 25% the speed of light.\n5. At 25% the speed of light it would take 168,000 Earth years to\n    reach the Canis Major dwarf.
984027
An ion engine will get you there the fastest. You get the biggest delta-vee per kg of exhaust. \n\nProblem is, in general you only get one encounter with a specific planet once each solar orbit, and you can only get a kick so large each time. I suppose you can hypothesize a super convenient planetary alignment that could shave off some time, but you might spend a long time waiting for that particular configuration.  A lot of really smart people spent a lot of time developing the computational tools to come up with the VEEGA and VVEJGA options.  I doubt the population here is going to come up with anything a lot better.\n\nYou can read more about the DS1 ion propulsion experimental system here:\nhttp://nmp.nasa.gov/ds1/tech/ionpropfaq.html\n\nThe first science mission using ion propulsion is the Pluto bound New Horizons.  Thanks to this tech, it will reach pluto in 10 short years and reaches Jupiter for a gravity assist in only 1 year.\n\nhttp://pluto.jhuapl.edu/mission/mission_timeline.html
426560
No, you can't. Even if you could accelerate yourself away from Earth at near the speed of light, you wouldn't experience any slow down of your local time. However, when you returned to Earth you'd find that people there had aged faster than you. They'd be older than you, but you'd still be the same biologic age as when you left.