Hubble's deep impact has reveled galaxy cluster located at about 14 billion LY from the earth. If Galaxies are not stationary, how the distance we are measuring today could be accurate (after 14 billion years)?
2007-03-07 22:24:47 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
A favorite creationist argument is the theory by Australian Barry Setterfield that the speed of light has been slowing down exponentially from the moment of creation. Based on this theory, light from the most distant galaxies would have covered most its journey to earth in the recent past, because (according to the theory) at that time it was traveling at a velocity millions of times faster than at present. Thus, according to Setterfield's hypothesis, the light from the most distant stars actually left those stars only a few thousand years ago. This would support the creationist contention that the universe is only a few thousand years old.
However, there is a problem with this theory, independent of the appalling lack of experimental data to support it. Distances to remote galaxies are measured by correlating the observed shift of spectral lines towards longer wavelengths with measurements that can be made on closer star systems. This shift towards longer wave lengths ("red shift") is the result of the light source moving away from the observer, thus stretching the wave lengths in a manner similar to the drop in pitch of a train whistle as the train goes by. This phenomenon is known as the Doppler shift. The relationship between the receding velocity V of the galaxy and the speed of light is given by:
V = c(wavelength shift/wavelength) (1)
where: c = velocity of light
2007-03-08 00:19:44 · answer #1 · answered by smart_shailendra 2 · 0⤊ 0⤋
Measurements are very accurate.
That distance is always when it was measured, few more readings will give as trajectory and we can calculate not only distances but future locations of the galaxy cluster.
This is how we are able to predict when comet "Kahutech"(spelling?) will be seen next time by us, how close it will come to the earth..
2007-03-07 22:27:42 · answer #2 · answered by minootoo 7 · 0⤊ 0⤋
All measurements are concern to blunders, different than for the particularly trivial one in each of counting a small type of goods. blunders shop on with to measuring the dimensions of a chew of wood with a carpentry rule, to the load of sugar for a cake to boot as to measuring the area to the subsequent city or galaxy. The sign of stable length is relief of blunders and estimation of ways super they may well be or are. maximum ordinary expositions of technological awareness do no longer coach the measured or envisioned blunders. The medical guides on which the ordinary stuff is bases in many situations do coach the envisioned blunders. If issues are moving in direction of you or away this in simple terms complicates issues. If some astronomic function is measured as being 10 billion LY away, meaning that the standard length on the time of length replaced into 10 billion LY. Andromeda is approximately 2.5 million LY away. close, by skill of astronomic standards. it is probable no longer moving far off from us at as quickly as or in any respect because it is area of the interior reach team of galaxies. What wall? Is the Universe spinning? it is increasing, so they say, in each and all the instructions it may whizz. What replaced into your element lower back?
2016-11-23 14:58:46 · answer #3 · answered by ? 4 · 0⤊ 0⤋
When it reaches the edge of the universe there is a big sign there and written on the sign are the words:
STOP HERE YOU CAN GO NO FURTHER
2007-03-08 10:27:35 · answer #4 · answered by Anonymous · 0⤊ 0⤋
it is will be accurate because velocity of light is constant and cannot be changed.
2007-03-07 22:32:34 · answer #5 · answered by Nikhil 1 · 0⤊ 0⤋