Where can I find the record of the distances of other galaxies from our's over a span of few decades?

Question

Is there a place where I can find the distance of galaxies from our galaxy measured from time to time. Say distances now and distance 10,20,30 years ago.

Thanks

At least at any two different time periods to get some difference in distances. There got to be some record else how can any one say its an expanding universe?

Answer 1

The distances do not change fast enough to detect. Galaxies all move at less than the speed of light, so that in 10 or 20 years time they move less than 10 or 20 light years in distance. But the distance to them is many millions of light years, and the uncertainty in the distance measurement is usually quite large, like plus or minus a million light years.

The speed that galaxies are moving away is measured directly from the Doppler shift of the light, as measured with a spectrograph. This is exactly how police radar guns measure a car's speed. They do not measure the distance to the car at two different times, they measure the speed directly from the Doppler shift of the reflected radio signal.

Answer 2

Our estimates of the distances to other galaxies are nowhere near precise enough to show movement over such a short time scale. Think about the scales involved. The nearest large galaxy is M31, about 2.5 million light years away. If it were moving a half the speed of light (which it certainly is not), it would move 15 light years in 30 years. No way we could measure the difference between 2,500,000 and 2,500,015!

Edit: The expansion of the universe is measured by redshift. Light waves from a receding object are stretched out, and so become redder. We can tell what the original wavelength was by spectroscopy.

Answer 3

there is no such data available I know of. Probbaly the size of the movement would be too small to measure in only decades. I know some have claimed to measure a rotation of the universe and you might lookin into that?

please be aware of some points of controversy about the nature of galactic distances

there is a raging debate on the size of the univeerse. Hubbels law says that red quarks are the farthest away but Halton Arp of Max Plank institute says quarks are near and galaxies throw them out often one above and one below and they become embrionic galaxies

also be aware that the standard Big Bang which has an infinite universe is challanged by one with a finite edge and therefor time dilation. By Russ Humphreys and his Starlight in Time theory. This causes time on earth to run faster than time near the edge perhaps allowing 6 days to go by on earth while millions of years go by at the edge

also be away of the Carnelian theory of relativity for galaxies
most of the universe is postulated to be cold dark matter and energy to explain the higher rate of spin of galxies than predicted and a more creation friendly but less big bang frienly adjustment ot the theory of general relativity is proposed by Carneli where expansion of space is locally frustrated and turned into a differential rotation requiring no cold dark matter... nuthin up your sleeves eh... sir Occum would be proud... data for this has been explored very positively by Harnette from Australia

Answer 4

Since methods for determining such distances are still being worked out, any data from decades past may well be inaccurate, compared to current data, and current data may be inaccurate with future methods. The data regarding differences in distance over only decades (astronomically minute times and distances) are likely to be even more inaccurate.

In short, I don't think you can get a reliable answer to your question. Here's a paper on the subject:
http://www.gemini.edu/documentation/webdocs/preprints/gpre95.pdf

Do a search on "Extragalactic Distance Scale" to find more information.

Answer 5

you won't find that...they do not move quickly enough for measurements precise enough for distances to change in such a a short time.