I have asked this question and got nothing but hatred and scorn. But seriously, how do we know how far away these stars, planatery bodies and other objects are? How do we know how big they are?
They say we know because of the distance it takes for light to get to us, but what if we are wrong.
What if they aren't far away, what if they are just really really small?
Would someone care to explain this for me?
Ka$h Killa lop guest User ID: 110725 08-07-2012 05:03 PM
I have asked this question and got nothing but hatred and scorn. But seriously, how do we know how far away these stars, planatery bodies and other objects are? How do we know how big they are?
They say we know because of the distance it takes for light to get to us, but what if we are wrong.
What if they aren't far away, what if they are just really really small?
Would someone care to explain this for me?
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
LoP Guest lop guest User ID: 74123 08-07-2012 05:05 PM
I have asked this question and got nothing but hatred and scorn. But seriously, how do we know how far away these stars, planatery bodies and other objects are? How do we know how big they are?
They say we know because of the distance it takes for light to get to us, but what if we are wrong.
What if they aren't far away, what if they are just really really small?
Would someone care to explain this for me?
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
Oh so we don't even know how long it takes light to travel?
I thought they said we did.
Hmm..
Ka$h Killa lop guest User ID: 110725 08-07-2012 05:08 PM
I have asked this question and got nothing but hatred and scorn. But seriously, how do we know how far away these stars, planatery bodies and other objects are? How do we know how big they are?
They say we know because of the distance it takes for light to get to us, but what if we are wrong.
What if they aren't far away, what if they are just really really small?
Would someone care to explain this for me?
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
Oh so we don't even know how long it takes light to travel?
I thought they said we did.
Hmm..
We know the speed of light. But theres no way to tell how many years its been traveling for. You need to know that to be able to calculate distance. Same thing with a plane. You can measure speed, but if you dont know travel time, theres no way to know distance
sixten Registered User User ID: 99554 08-07-2012 05:10 PM
Posts: 710
Speed of light is 86,000 miles per second, Proxima Centuri (nearest star) is allegedly about 4 light years away. I think that would equate to about 16 trillion miles
LoP Guest lop guest User ID: 113030 08-07-2012 05:11 PM
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
This is how they do it. they can get the wavelength and magnitude of light at different points in the earths rotation around the sun and at different different amounts of atmosphere densities.
it is basically just solving a system of complex variables. you can start with our sun and moon. we know its absolute distance based on gravity equations, don't even need to use inferonomy. then you prove it for the planets. you lose the gravity baseline outside the solar system.
seasnake Registered User User ID: 67904 08-07-2012 05:11 PM
Posts: 6,450
I have asked this question and got nothing but hatred and scorn. But seriously, how do we know how far away these stars, planatery bodies and other objects are? How do we know how big they are?
They say we know because of the distance it takes for light to get to us, but what if we are wrong.
What if they aren't far away, what if they are just really really small?
Would someone care to explain this for me?
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
you are right its from red shifting, but red shifting does not explain why we observe multiple images of the same galaxies which is believed to be some sort of mirror effect (mirror effect, where they heck are these mirrors at anyways?)... I still don't believe our definition of the "second" is correct as we measure the "second" by counting X amount of waves during a duration of time and waves seem like they would be relative and fluctuate at different peaks and troughs based upon whatever they are passing through (gravity supposedly bends light right, and the rate of radioactive decay most likely is affected by something, and empty space doesn't naturally as it is impossible to ever reach absolute zero as it can only be approached)
CooterBrown Registered User User ID: 49022 08-07-2012 05:11 PM
Posts: 9,729
.
I know that, as usual, these are pearls before swine but ...
The Italian astronomer Geminiano Montanari recorded observing
variations in luminosity of the star Algol in 1667. Edmond Halley
published the first measurements of the proper motion of a pair of
nearby "fixed" stars, demonstrating that they had changed positions
from the time of the ancient Greek astronomers Ptolemy and
Hipparchus. The first direct measurement of the distance to a star (61
Cygni at 11.4 light-years) was made in 1838 by Friedrich Bessel using
the parallax technique.
Parallax is a displacement or difference in the apparent position of an
object viewed along two different lines of sight, and is measured by
the angle or semi-angle of inclination between those two lines. The
term is derived from the Greek parallaxis, meaning "alteration". Nearby
objects have a larger parallax than more distant objects when
observed from different positions, so parallax can be used to
determine distances.
Speed of light is 86,000 miles per second, Proxima Centuri (nearest star) is allegedly about 4 light years away. I think that would equate to about 16 trillion miles
186.000, or 300.000 Km per second. Or so they say..
Obi-one kenobi - Only a Sith deals in absolutes. G-w-Bush - Either you are with us or your with the terrorists.
evo Registered User User ID: 108869 08-07-2012 05:13 PM
Posts: 3,258
I have asked this question and got nothing but hatred and scorn. But seriously, how do we know how far away these stars, planatery bodies and other objects are? How do we know how big they are?
They say we know because of the distance it takes for light to get to us, but what if we are wrong.
What if they aren't far away, what if they are just really really small?
Would someone care to explain this for me?
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
Oh so we don't even know how long it takes light to travel?
I thought they said we did.
Hmm..
Oh My... we do know how fast light travels. When it comes to science advice, the biggest bit of advice I'm going to give you would be don't ask here. Too many people here will give you wrong answers and some don't believe in science unless it agrees with their preconceptions.
A common method to measure distance is to to use triangulation, it's not the only method and it's not use on all stars.
So you take a measurement at one point, wait half a year when the Earth is on the other side of the sun and take the measurement again. Because we know width of our orbit we can use that with the measurements we took to figure out how far away that star is.
Stars that are too far away for this technique to work is based on the star brightness and red/blue shift.
seasnake Registered User User ID: 67904 08-07-2012 05:14 PM
Posts: 6,450
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
This is how they do it. they can get the wavelength and magnitude of light at different points in the earths rotation around the sun and at different different amounts of atmosphere densities.
it is basically just solving a system of complex variables. you can start with our sun and moon. we know its absolute distance based on gravity equations, don't even need to use inferonomy. then you prove it for the planets. you lose the gravity baseline outside the solar system.
lol, based upon gravity equations and yet we still don't know what gravity even is, we base our measurements on it by the "second" to which we have to simply take their word upon
LoP Guest lop guest User ID: 74123 08-07-2012 05:14 PM
I have asked this question and got nothing but hatred and scorn. But seriously, how do we know how far away these stars, planatery bodies and other objects are? How do we know how big they are?
They say we know because of the distance it takes for light to get to us, but what if we are wrong.
What if they aren't far away, what if they are just really really small?
Would someone care to explain this for me?
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
you are right its from red shifting, but red shifting does not explain why we observe multiple images of the same galaxies which is believed to be some sort of mirror effect (mirror effect, where they heck are these mirrors at anyways?)... I still don't believe our definition of the "second" is correct as we measure the "second" by counting X amount of waves during a duration of time and waves seem like they would be relative and fluctuate at different peaks and troughs based upon whatever they are passing through (gravity supposedly bends light right, and the rate of radioactive decay most likely is affected by something, and empty space doesn't naturally as it is impossible to ever reach absolute zero as it can only be approached)
Unless what we are looking at is like a giant wall paper covering what's really there? Or a hologram, it just so happens that these images are repeating.
LoP Guest lop guest User ID: 74123 08-07-2012 05:16 PM
I dont get it either. I thingk they said distance can be measured by the red shift whatever that means. Something about diffraction of red light as it enters the atomsophere. You cant tell directly because theirs no way of knowing how long light takes to reach the earth.
This is how they do it. they can get the wavelength and magnitude of light at different points in the earths rotation around the sun and at different different amounts of atmosphere densities.
it is basically just solving a system of complex variables. you can start with our sun and moon. we know its absolute distance based on gravity equations, don't even need to use inferonomy. then you prove it for the planets. you lose the gravity baseline outside the solar system.
A system of complex variables, given that your constants are actually accurate.......
evo Registered User User ID: 108869 08-07-2012 05:16 PM
Posts: 3,258
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