I am currently taking a break from philosophy and my thesis-related work to write up an astronomy essay which is due at the end of the month. In the process, I went back to the one I wrote last year, to check out some stuff I wrote there.
It seemed a waste to leave it rotting in my hard drive (especially since science-related stuff tend to age very quickly), so I reformatted it, and uploaded on Scribd. It is an introduction to the history of, and current research around, dark energy: pretty basic, but I think it is still more detailed than the average New Scientist popular article on the topic. So well, if anyone is interested, I am posting it here.
EDIT – Thanks to the comment of Grad Student below I identified a couple of mistakes in the paper. Unfortunately it turns out that the original .doc format file is now corrupted so I can’t create a new corrected .pdf to upload on Scribd. Therefore, note that the equation of state on page 14 should have w and not omega on the left side and that all the cosmological constraints presented by Vikhlinin et al., which I discuss on page 16, were determined by observations of galaxy clusters and not superclusters.