Space Exploration

Are NASA's future missions and budget justified?

  • It's worth the time and expenditures

    Votes: 223 66.0%

  • Complete waste of money

    Votes: 41 12.1%

  • We need to explore, but not at the current cost

    Votes: 74 21.9%
  • Total voters
    338
#777
#777
SergeantVol said:
Gravity is what causes us to age and affects time. With a lack of a gravitational pull you would be near ageless. However, without gravity you would have medical issues with internal organs, etc.
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It's not gravity that affects time dialation as velocity increases.
 
#778
#778
W.TN.Orange Blood said:
Extra-terrestrials.....they don't come close to the State of Tennessee. This state is too boring & nothing going on for them to even check out.
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False...they park on top of the Clingman's dome tower and watch the sunrise.
 

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#782
#782
Space and time are the same thing. Time works exactly like space...like space there is no beginning or end. Space just is. Time just is. We traverse through space and we traverse through time. We don't bring future events into existence, the same way we don't bring France into existence by traveling there, we just displace ourself in time like we displace ourself in space. This is what Einstein meant by the term "space-time". The distortion of this space time fabric is what causes gravity.

And none of that is theoretical. It can experimentally demonstrated.

Faster than light travel is theoretically possible if we could artificially warp the space-time fabric around a space craft. If we could do that, than these planets would certainly be within reach.
 
#783
#783
rjd970 said:
Space and time are the same thing. Time works exactly like space...like space there is no beginning or end. Space just is. Time just is. We traverse through space and we traverse through time. We don't bring future events into existence, the same way we don't bring France into existence by traveling there, we just displace ourself in time like we displace ourself in space. This is what Einstein meant by the term "space-time". The distortion of this space time fabric is what causes gravity.

And none of that is theoretical. It can experimentally demonstrated.

Faster than light travel is theoretically possible if we could artificially warp the space-time fabric around a space craft. If we could do that, than these planets would certainly be within reach.
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I may be wrong, and i dont think science knows yet for sure, but indont think distortions in spacetime cause gravity. I think we have learned from black holes, which are super massive and therefore have huge gravity, that huge amounts of gravity distort spacetime...but not the inverse. It is proposed that huge gravity from blackholes causes distortion in spacetime, which we call wormholes.

Einstein proposed that the universe is like a piece of fabric or a sheet of paper and can be folded, thus making 2 different points very gar apart "overlap" eachother in a shortcut across our universe, much like a wormhole.

Theoretically, anything with mass that enters a blackhole is thought to be destroyed...but leaves behind its gravity. Thats how incredible amounts of gravity are concentrated in supermassive black holes...the gravity of which causes entire galaxies to orbit around the black holes in the same way that the gravity of the sun vauses earth to rotate around it. Only blackholes that are older and have had time to become supermassive from eating up stars and such are large enough to twist entire galaxies.

All of this is of course theoretical. We can only draw conclusions based on what we are now able to see since we got the hubble telescope into space. Before that we couldnt even see far enough away to guess about black holes, neutrino stars, supermassives, dark matter etc. We have come a very long way in the last 30 years or so...Theoretically.

I am just a dumb Christian that never went to college but i am fascinated by science, especially astronomy. I am certain we are not alone...probably not even alone in this galaxy. To say that a galaxy or supermassive bh is huge is like saying infinity is a bunch. Huge understatement. Night guys
 
#784
#784
marcusluvsvols said:
I may be wrong, and i dont think science knows yet for sure, but indont think distortions in spacetime cause gravity. I think we have learned from black holes, which are super massive and therefore have huge gravity, that huge amounts of gravity distort spacetime...but not the inverse. It is proposed that huge gravity from blackholes causes distortion in spacetime, which we call wormholes.

Einstein proposed that the universe is like a piece of fabric or a sheet of paper and can be folded, thus making 2 different points very gar apart "overlap" eachother in a shortcut across our universe, much like a wormhole.

Theoretically, anything with mass that enters a blackhole is thought to be destroyed...but leaves behind its gravity. Thats how incredible amounts of gravity are concentrated in supermassive black holes...the gravity of which causes entire galaxies to orbit around the black holes in the same way that the gravity of the sun vauses earth to rotate around it. Only blackholes that are older and have had time to become supermassive from eating up stars and such are large enough to twist entire galaxies.

All of this is of course theoretical. We can only draw conclusions based on what we are now able to see since we got the hubble telescope into space. Before that we couldnt even see far enough away to guess about black holes, neutrino stars, supermassives, dark matter etc. We have come a very long way in the last 30 years or so...Theoretically.

I am just a dumb Christian that never went to college but i am fascinated by science, especially astronomy. I am certain we are not alone...probably not even alone in this galaxy. To say that a galaxy or supermassive bh is huge is like saying infinity is a bunch. Huge understatement. Night guys
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Words like "proven" are rare in these cases. However it was shown in 1920 using a simple telescope that the mass of the sun caused a beam of light from a distant star to curve. That is unmistakable evidence of mass curving space (and therefore time). That is as close as one can get to demonstrating the mass of a large object distorting space causes gravity.
 
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#785
#785
rjd970 said:
Faster than light travel is theoretically possible if we could artificially warp the space-time fabric around a space craft. If we could do that, than these planets would certainly be within reach.
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You've got a few years. But I'd suggest getting a house in Bozeman, Montana if you are willing to wait.

Watch out for those Econs though.
 
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#789
#789
rjd970 said:
Words like "proven" are rare in these cases. However it was shown in 1920 using a simple telescope that the mass of the sun caused a beam of light from a distant star to curve. That is unmistakable evidence of mass curving space (and therefore time). That is as close as one can get to demonstrating the mass of a large object distorting space causes gravity.
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That makes sense. I guess its a natural paradox? There is so much thatbwe dont know yet. Most of it I beleieve we will never know for sure unless aliens show us. I believe that the Lord will come back before we travel that far. Even if i didnt, i think we would do ourselves in before we could harness lightspeed tech. Too many ways to die...Super bug like MRSA on steroids,war, terrorism,etc.
 
#792
#792
rjd970 said:
Space and time are the same thing. Time works exactly like space...like space there is no beginning or end. Space just is. Time just is. We traverse through space and we traverse through time. We don't bring future events into existence, the same way we don't bring France into existence by traveling there, we just displace ourself in time like we displace ourself in space. This is what Einstein meant by the term "space-time". The distortion of this space time fabric is what causes gravity.

And none of that is theoretical. It can experimentally demonstrated.

Faster than light travel is theoretically possible if we could artificially warp the space-time fabric around a space craft. If we could do that, than these planets would certainly be within reach.
Click to expand...

There is a theory that says it's possible to warp space. The problem is that it would take the same amount of energy to warp space as it would to accelerate mass to light speed. You may not find it believable but the amount of energy that would be required is more than the total energy of the universe. It requires infinite energy to accelerate even the mass of one proton to the speed of light.
 
#794
#794
MT LeConte said:
There is a theory that says it's possible to warp space. The problem is that it would take the same amount of energy to warp space as it would to accelerate mass to light speed. You may not find it believable but the amount of energy that would be required is more than the total energy of the universe. It requires infinite energy to accelerate even the mass of one proton to the speed of light.
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From what i have read and watched this is true. All the energy in our galaxy is believed to not be enough to get a ship to light speed. Dont think we ever get there...
 
#797
#797
slobberknocker said:
Give me a few days to try and understand this. I'm just an old country boy from TN. I regret to this day I didn't follow my dream of being an Astronomer. Decides on politics and government service. Go figure.
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If it helps, think about it like a map. If I leave Atlanta and travel to Knoxville for a game in the fall, I have to travel Northeast. If I travel at 80 mph, some percentage of my speed is in direction of North while some other percentage is in the direction of East. Given that Knoxville is more North than East, it would probably be something like 60 mph North and 20 mph East. Together, that is 80 mph Northeast.

To switch it to physics, you have four directs: X (right-left), Y (up-down), Z (forward-backwards), time (past-future). Remember, spacetime is one, malleable entity. Additionally, everything is traveling at a constant speed through spacetime, C (speed of light). How fast one is moving through time depends on the percentage of that entity's speed (C) in the time dimension.

Like with the map analogy, if one directs their velocity in one particular direction/dimension, their will be less velocity in the other direction/dimension (given constant speed).

So, let's say you and buddy are working on a car. Y'all finish the work and your buddy drives it around the block while you wait for him to get back. Due to him redirecting some of his absolute, constant velocity (C) through the universe into the X, Y, Z plane by driving around the block, he has slowed down his time and thus aged less than you have standing there. Now, given that the redirection of his velocity is so small compared to C, it goes unnoticed by both of y'all.

Obviously, the closer one is able to reach C in the X, Y, Z planes, the more pronounced the effects on time are. It why space shuttles and satellites* are used as examples instead of your buddy driving around the block. Nevertheless, Special Relavitiy applies to both.

*If you didn't know, the atomic clocks on satellites have to constantly be updated due to time dilation because of their velocity. If not, instead of guiding you to your intended destination, it would guide you into the ocean.
 
#799
#799
SergeantVol said:
And I could be wrong on this, I am by no means a physicist, but I believe that since there is not as much gravity (relative to what we have on Earth) space travel would be easier to travel at faster speeds.
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Gravity just is.

Sure, one needs a lot energy to overcome gravity here on Earth in order to achive orbit and to a lesser extent, leave orbit. However, keep in mind that the Moon's gravity made the Applo missions possible. We used the Moon's gravity to slingshot ourselves back to Earth.

Think of gravity like a topographic map. Depending where you are on the map and where you want to go, the terrain can either benefit you or be your biggest obstacle.
 
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#800
#800
alexmanu said:
I love this topic and the discovery today is a really special one - three earth-sized planets in the habitable zone only 40 light years away. Amazing. When they are able to analyse the atmosphere of those exoplanets, and detect the levels of oxygen & methane present, then they could be able to say with some confidence that life likely exists on one or more of those exoplanets.

I hope that we have some real tangible proof that we are not alone in the Universe in the next decade.
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Not alone would imply intelligent life. Quite different than merely life. We might not have to look outside our own solar system for that.
 
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