[ 3 / biz / cgl / ck / diy / fa / ic / jp / lit / sci / vr / vt ] [ index / top / reports ] [ become a patron ] [ status ]
2023-11: Warosu is now out of extended maintenance.

/sci/ - Science & Math

View post   
File: 144 KB, 252x284, 1275438801522.gif [View same] [iqdb] [saucenao] [google]
5407974 No.5407974 [Reply] [Original]

Let's say you want to visit the Andromeda Galaxy (2.5 million light-years away). If I understand relativity correctly, it is possible to do this within your lifetime if you travel very close to the speed of light.

Is this true? If so, what would you see when you got there? Andromeda as it looks to us today from earth, or as it will appear 2.5 million years from now from earth, or as it will appear 5 million years from now from earth?

>> No.5407986

>>5407974
>or as it will appear 2.5 million years from now from earth
This

>> No.5407992

>>5407974
>as it will appear 5 million years from now from earth?
this

>> No.5408030
File: 17 KB, 413x395, grin.jpg [View same] [iqdb] [saucenao] [google]
5408030

>>5407986
>>5407992

>> No.5408057
File: 12 KB, 300x305, 1340666529113.jpg [View same] [iqdb] [saucenao] [google]
5408057

>>5407986
>>5407992

>> No.5408065

>>5407974
>very close to the speed of light
yes, if you travel "very close to the speed of light" you can get literally anywhere in the universe in your lifetime.

everyone on earth you knew will be dead, billions of years might pass while you are protected by effects of relativity, one blink of an eye of you would take so long that on earth civilizations rise and fall.

we can accellerate atoms to such speeds, there's nothing stopping us from doing it with spaceships, except money, scale and oh god all the energy.

>> No.5408066

It's 5 million years. If you traveled there it would take just over 2.5 million years form earths perspective but once you got there you would see light that would have to travel all the way to earth, which would take another 2.5 million years.

>> No.5408073

>>5408065
>here's nothing stopping us from doing it with spaceships

lol

>> No.5408079

>>5408073
i was thinking about a planet sized "particle" accellerator to shoot the spaceship out into the universe.

good luck stopping. in one piece.

>> No.5408087

>>5408065
>yes, if you travel "very close to the speed of light" you can get literally anywhere in the universe in your lifetime.

uh, OP said it was 2.5 million light-years to reach the nearest galaxy.

2.5 million years is not "in your lifetime".

/sci/ is a joke. a big fucking joke. it's either trolls, or junior-scientists who know zero.

>> No.5408094

>>5408087
are you retarded

>> No.5408100

>>5408087

I think OP was talking about relativity, time distorts at very fast speeds if im not mistaken

>> No.5408103

>>5408087
>OP said it was 2.5 million light-years to reach the nearest galaxy.
Time dilation. I really don't know how you can miss that. I think you're pretty much the bottom of the pile.

>> No.5408106
File: 563 KB, 1831x963, moonsugar.png [View same] [iqdb] [saucenao] [google]
5408106

pic related

>> No.5408107

>>5408079
Even if we could accelerate ships to such high speeds then any and all particles in its path will hit the ship at close to lightspeed and destroy it.

>> No.5408109

>>5408103

oh yeah, i forgot about "magic".

/sci/, you never fail me.

>> No.5408110

>>5408094
>>5408100
>>5408103

ok, clowns: you do agree that it takes "light" 2.5 million years to get here from the adromeda galaxy, don't you? or does relativity make it get here in a year or so?

god, i can't believe i'm discussing this.

>> No.5408111

>>5408109
>Remark at how bad /sci/ is.
>Fail at high school relativity
>Attempt to save face by calling it "magic".

This is why /sci/ is shit.

>> No.5408116

>>5408110
From the perspective of earth, it will take the spacecraft a little over 2.5 million years. From the perspective of the spacecraft it can take as little time as want as long as it's non-zero.

>> No.5408119
File: 2.30 MB, 302x187, so hard.gif [View same] [iqdb] [saucenao] [google]
5408119

Are you kidding me, /sci/?

>> No.5408165

>>5408110
>Not knowing about time dilation, arguably one of the coolest things we know about physics

Oh my God.

>> No.5408417
File: 122 KB, 256x256, Nonsymmetric_velocity_time_dilation.gif [View same] [iqdb] [saucenao] [google]
5408417

>lrn2timedilate

>> No.5408884

bump

>> No.5409201

So what is it? Anyone intelligent agrees it's possible. But would you see Andromeda as it is today, or as it is 2.5 million years into earth's future, or 5 million years into earth's future?

>> No.5409233

>>5409201
5 million.

Earth sees it as it was 2.5 million years ago, if you could instantly teleport there you would see it as Earth will see it in 2.5 million years.

It would take you an additional 2.5 million years (from Earth's frame of reference) to reach it at light speed.

You would see it as Earthw will see it 5 million years from now.

>> No.5409237

How would you keep your sanity for 2.5 million years? Wouldn't you be an incoherently babbling coprophile after such a long journey?

>> No.5409243

>>5409237
Again, time dilation. The closer to c you travel the less time passes from your frame.

If you were a photon traveling at c the concept of time would be meaningless to you

>> No.5409247

>>5408073
imagine if nasa had the budget of the whole usa's army, for 50 years

we would be in fucking alpha centauri and von neumann probes everywhere.