The 3 Hubble Diagrams

The results from the 3 Hubble diagrams vary in accuracy, this is measured by the R2 value which in other terms means the distribution of the data in relation to the fitted line of regression. The diagrams are also all measured by using apparent magnitude which is the measure of brightness as viewed from the earth and does not take into consideration distance which can mean results are not as accurate in comparison to absolute magnitude. Absolute magnitude is measured the magnitude of the star if it was at a distance of 10 parsecs which gives it a baseline. However, the great benefit of using Hubble diagrams is that the only information needed is the relative distance to a galaxy or galaxies and not an absolute distance that can be measured in light-years or miles.

In the class practical, the diagram was based on our own experiment that we performed. It measured at 76% which is too low to class as scientifically accurate. However, some of the issues are inevitable for this experiment, for example the balloon is a 2D similitude for a 3D situation. The way we approached the experiment is that everything occurs on the surface of the balloon which is flat or 2D so it stretches comparatively and equally with the 2 directions in which the balloon is getting blown up in.
On the other hand, the universe by theory …show more content…
For this very reason his approximation of the constant (H) would have been altered by the peculiar motions of the very galaxies in which he was observing. To get more accurate and better results, the galaxies used should have a distance much greater so that the cosmological redshift that is caused by the expansion of space is much more substantial than the Doppler redshift ascribed to the the induvial galaxies peculiar motions though the