1. Post #1
    Mettrone's Avatar
    March 2012
    71 Posts
    So I was staring at my carrot today as I usually do and I had a weird itch in my eye lid (the left one) and then I thought of this brilliant idea, to send a mirror hurled through space so we can observe the mirror (through a telescope) and see us back on earth. Now if the mirror is a light year away then (theoretically speaking) we should be looking at us back in time?

    So I have already sent a thesis of this to NASA as well as a few other well known cosmological businesses. however I am still yet to hear from them I still have a great feeling about project. I have drawn up a scientific diagram for you guys to peruse and to give me feedback.

    Cheers

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  2. Post #2
    Gold Member
    Lhuth's Avatar
    July 2011
    237 Posts
    That's a pretty neat idea, but I don't really see how it's any difference to filming someone and then watching it back on TV?
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  3. Post #3
    Gold Member
    Captain Forever's Avatar
    March 2006
    725 Posts
    it'd have to be a pretty big mirror, could someone do some science to affirm how impractical and useless this is

    also if you're saying that looking at that hypothetical mirror means looking back to before the rocket was launched then you're a massive idiot
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  4. Post #4
    Mettrone's Avatar
    March 2012
    71 Posts
    That's a pretty neat idea, but I don't really see how it's any difference to filming someone and then watching it back on TV?
    We would be able to see what happen before TV it would give us a new perspective on life and our history.
    If it works we could even get a cosmological CCTV camera in the works now THAT would be neat.
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  5. Post #5
    Gold Member
    -TRASE-'s Avatar
    September 2007
    3,827 Posts
    Not new at all. In fact you never see the present.
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  6. Post #6
    Extraction Point
    Empty_Shadow's Avatar
    July 2006
    8,150 Posts
    You wouldn't be able to see any point in time before the mirror left earth at best, since it can't travel faster than light. To see light from before it was launched it would have to go faster than the speed of light and outrun the photons coming off the earth.

    Also it'd be impossible to see the reflections off it, earth would be far too small.
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  7. Post #7
    Gold Member
    RayvenQ's Avatar
    December 2004
    9,374 Posts
    Or, you know, we could send up a satellite, have a video camera on it, use it to record then play it back a year later.

    If you sent it 1 lightyear away, assuming you power the rocket all the way (impractical) then you'd only reallyafter you launched the mirror. It's not like you could use it to see far back in the past.

    Edited:

    We would be able to see what happen before TV it would give us a new perspective on life and our history.
    If it works we could even get a cosmological CCTV camera in the works now THAT would be neat.
    No you wouldn't, being a light year away doesn't mean it magically captures things that happened before it was even launched.
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  8. Post #8
    Gold Member
    Buck.'s Avatar
    February 2007
    2,142 Posts
    There is a mirror on the surface of the moon already I think. Something makes me think you would see some trippy shit on the mirror if its 1 light year away.

  9. Post #9
    Gold Member
    RayvenQ's Avatar
    December 2004
    9,374 Posts
    There is a mirror on the surface of the moon already I think. Something makes me think you would see some trippy shit on the mirror if its 1 light year away.
    If it was 1 light year away and then you looked at it, all you'd possibly see is the earth a year ago. Not even clearly since, you know, the earth only reflects light, it doesn't make it.
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  10. Post #10
    Gold Member
    Lolkork's Avatar
    December 2009
    5,408 Posts
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  11. Post #11
    Mettrone's Avatar
    March 2012
    71 Posts
    If you will notice the title, thanks

  12. Post #12
    Proudly supporting the JIDF
    Dennab
    July 2010
    22,111 Posts

    So I have already sent a thesis of this to NASA as well as a few other well known cosmological businesses.
    however I am still yet to hear from them
    Bahahahaha.
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  13. Post #13
    Gold Member
    taipan's Avatar
    September 2005
    5,538 Posts
    If a massive mirror would pop up 100 lightyears away, it would catch the light reflected by the earth 100 years ago and we will see 100 years back in to the past in a 100 years. (so 2212 people would see me typing this).
    (If you leave out the resolution or whatever aspect)

    The speed of light is: 300,000km/s and the cruise speed of the latest mars probe was around 1-4km/s (i think)

    So assuminge you live a 100 years:
    Convert to Years:
    4km*60s*60m*24h*365d*100y=1.26144*10^10km =12.303.360.000Km

    Distance devided by speed=time & convert back to hours.
    12303360000/Lightspeed=12.303.360.000/300.000=41011,2seconds=11.39200 hours.


    If you are sending it there right now at 4km/s you could look back maybe half a day at the end of your lifetime. :P


    (Edit: Actually it would be more like 5,5 hours because the light will need to get there first)
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  14. Post #14
    Gold Member
    Dennab
    January 2005
    4,680 Posts
    what's so fascinating about seeing ourselves that it justifies the enormous pricetag
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  15. Post #15
    Gold Member
    Squeegy Mackoy's Avatar
    September 2005
    1,906 Posts
    If a massive mirror would pop up 100 lightyears away, it would catch the light reflected by the earth 100 years ago and we will see 100 years back in to the past in a 100 years. (so 2112 people would see me typing this).
    (If you leave out the resolution or whatever aspect)

    The speed of light is: 300,000km/s and the cruise speed of the latest mars probe was around 1-4km/s (i think)

    So assuminge you live a 100 years:
    Convert to Years:
    4km*60s*60m*24h*365d*100y=1.26144*10^10km =12.303.360.000Km

    Distance devided by speed=time & convert back to hours.
    12303360000/Lightspeed=12.303.360.000/300.000=41011,2seconds=11.39200 hours.


    If you are sending it there right now at 4km/s you could look back maybe half a day at the end of your lifetime. :P
    Now we try and find out what the most powerful optics in existance are and just how huge this monufuckingmental mirror would have to be and how on earth we get something so huge into space.

  16. Post #16
    Gold Member
    Buck.'s Avatar
    February 2007
    2,142 Posts
    If the mirror was moving at light speed, away from earth, would the image be frozen?
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  17. Post #17
    Dennab
    September 2008
    1,149 Posts
    Not new at all. In fact you never see the present.
    You see the present in the past.

  18. Post #18
    Ask me about my .gif fetish
    st0rmforce's Avatar
    February 2008
    3,594 Posts
    Just to give you some perspective, this is what the earth looks like from only 6 billion km away (taken by voyager in 1990).

    It took 23 years for voyager to get that far away, but the light that made up the image only took about 5 hours to get to it (and then the picture took roughly the same amount of time to get back via the radio link, plus time for encoding).
    After 23 years of waiting they finally succeeded in taking a picture of Earth, as it was earlier that day.
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  19. Post #19
    italian
    TerabyteS_'s Avatar
    June 2011
    2,644 Posts
    Just to give you some perspective, this is what the earth looks like from only 6 billion km away (taken by voyager in 1990).

    It took 23 years for voyager to get that far away, but the light that made up the image only took about 5 hours to get to it (and then the picture took roughly the same amount of time to get back via the radio link, plus time for encoding).
    After 23 years of waiting they finally succeeded in taking a picture of Earth, as it was earlier that day.
    Why is the Earth the only bright dot in the picture?

  20. Post #20
    PN_Redux's Avatar
    July 2010
    1,218 Posts
    Just to give you some perspective, this is what the earth looks like from only 6 billion km away (taken by voyager in 1990).

    It took 23 years for voyager to get that far away, but the light that made up the image only took about 5 hours to get to it (and then the picture took roughly the same amount of time to get back via the radio link, plus time for encoding).
    After 23 years of waiting they finally succeeded in taking a picture of Earth, as it was earlier that day.
    It really fascinates me how even though it's so far away, made with "ancient" technology, it can still communicate and reach us. and the fact that the radio waves only take 5 hours to reach us. Mindblowing

    Why is the Earth the only bright dot in the picture?
    it's probably highlighted to show where it is.
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  21. Post #21
    Falubii's Avatar
    May 2010
    3,437 Posts
    If the mirror was moving at light speed, away from earth, would the image be frozen?
    Can't break light speed bro.
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  22. Post #22
    Hello Handsome
    ForgottenKane's Avatar
    February 2010
    13,709 Posts
    If the mirror was moving at light speed, away from earth, would the image be frozen?
    According to the laws of physics, the faster you go, the more you weigh. It's said that once something with any mass (as opposed to light, which has none) reaches light speed, it's mass will become infinity; thus destroying the universe.

    So, to answer your question, no.
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  23. Post #23
    Crimptor's Avatar
    January 2012
    689 Posts
    According to the laws of physics, the faster you go, the more you weigh. It's said that once something with any mass (as opposed to light, which has none) reaches light speed, it's mass will become infinity; thus destroying the universe.

    So, to answer your question, no.
    That's not so, IIRC. It's not the mass that reaches infinity, it's the energy that it takes to keep it going. And it wouldn't destroy the universe - there are already things that have "infinite" mass. Although the mass itself isn't infinite, the density is so in a way it is infinite. I'm talking about the singularity in the center of a black hole.

    Now I'm going to sit here and wait for JohnnyMo to prove me wrong.
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  24. Post #24
    Hello Handsome
    ForgottenKane's Avatar
    February 2010
    13,709 Posts
    That's not so, IIRC. It's not the mass that reaches infinity, it's the energy that it takes to keep it going. And it wouldn't destroy the universe - there are already things that have "infinite" mass. Although the mass itself isn't infinite, the density is so in a way it is infinite. I'm talking about the singularity in the center of a black hole.

    Now I'm going to sit here and wait for JohnnyMo to prove me wrong.
    How about I prove you wrong. The mass of a black-hole is only infinite in the center, which is infinitely small. Black holes in general are a horrible example to use, since we know little to nothing on how they work.

    Then again, what I proposed is also just theory. Doubled-edged sword to this entire argument.
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  25. Post #25
    Gold Member
    Trumple's Avatar
    September 2009
    6,205 Posts
    In theory, if the mirror was 1 light year away, say (and not moving, to keep things simple) if you somehow DID manage to see the reflection in the mirror, it would be a reflection of the earth 2 years ago.
    Pointless, and impractical!
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  26. Post #26
    DestructoTron's Avatar
    March 2012
    43 Posts
    If the mirror was moving at light speed, away from earth, would the image be frozen?
    A similar thought is what inspired Einstein to formulate his theory of relativity.

    He wondered what a clock tower would look like if the cab he was in was moving away from it at the speed of light.

    Fun fact!
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  27. Post #27

    March 2012
    13 Posts
    You guys are completely missing the point. If the mirror is 100000000 light years away, we could watch the earth form, the dinosaurs, cavemen evolving etc.

    I'm sure in the vastness of space there are anomalies consisting of matter reflective enough for us to see ourselves if our telescopes are powerful enough.

    Be open minded people!
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  28. Post #28
    someguywithagun's Avatar
    January 2010
    428 Posts
    Well, assuming that you have a strong enough telescope and a good size mirror that is resistant to space dust as well as being able to move faster than light, you could actually do this. It, however, is completely impractical, better you have good record keeping.

    Carl Sagan's pale blue dot:
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  29. Post #29
    AeroSinthetic's Avatar
    August 2010
    1,496 Posts
    You guys are completely missing the point. If the mirror is 100000000 light years away, we could watch the earth form, the dinosaurs, cavemen evolving etc.

    I'm sure in the vastness of space there are anomalies consisting of matter reflective enough for us to see ourselves if our telescopes are powerful enough.

    Be open minded people!
    If every hypothetical you have made is true, then yes, that could possibly happen.

  30. Post #30
    Gold Member
    squids_eye's Avatar
    July 2006
    5,616 Posts
    Maybe if we discover an alien species thousands of light years away who happen to have built a giant mirror facing us for no real reason we could do this. The chances are pretty slim though.
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  31. Post #31
    someguywithagun's Avatar
    January 2010
    428 Posts
    Maybe if we discover an alien species thousands of light years away who happen to have built a giant mirror facing us for no real reason we could do this. The chances are pretty slim though.
    Why would they need the mirror? More like line of sight to us.

  32. Post #32
    Gold Member
    taipan's Avatar
    September 2005
    5,538 Posts
    According to the laws of physics, the faster you go, the more you weigh. It's said that once something with any mass (as opposed to light, which has none) reaches light speed, it's mass will become infinity; thus destroying the universe.

    So, to answer your question, no.
    Nope the energy needed to accelerate it to C is infinite.

    The mass of the object doesnt change with speed just its kinetic energy and time perception.
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  33. Post #33
    McCarthy's Avatar
    July 2010
    640 Posts
    Bro, all you'd see is the earth a couple of years ago- AKA nothing new.

    Edited:

    What i mean is you would NEVER be able to see specific details
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  34. Post #34
    Falubii's Avatar
    May 2010
    3,437 Posts
    Nope the energy needed to accelerate it to C is infinite.

    The mass of the object doesnt change with speed just its kinetic energy and time perception.
    Mass is actually relative.
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  35. Post #35
    boy i sure do love it when my title doesnt fit
    LuaChobo's Avatar
    December 2009
    6,174 Posts
    I wonder how many times people have come up with this idea.

  36. Post #36
    Falubii's Avatar
    May 2010
    3,437 Posts
    Too many.
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  37. Post #37
    boy i sure do love it when my title doesnt fit
    LuaChobo's Avatar
    December 2009
    6,174 Posts
    It's just a generally dumb idea, If he really sent it to NASA (or thinks he did) that is amazing.
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  38. Post #38
    Falubii's Avatar
    May 2010
    3,437 Posts
    At least he's trying to be involved with science.
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  39. Post #39
    Gold Member
    Croix's Avatar
    May 2008
    2,740 Posts
    dude you shouldnt have posted this here someone will steal it!

    go patent it hurry

  40. Post #40
    imasillypiggy's Avatar
    December 2009
    8,851 Posts
    I had a better scientific idea. Get a long stick (about a trillion light years long) and start poking distant planets. You will be able to transmit pokes instantly without the light barrier to stop you beating the speed of light.
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