I am writing a 2nd year essay for my Physics degree, and have chosen dark energy as my topic. I've been reading papers and material for around a week now, and would like some reassurance that I am heading in the right direction and have made no major blunders or omissions. Here's the general structure of my essay ATM. Hubble's observations of red shifts Study of early universe requires old bright objects (discard Cepheids, SN 1a use) Recent study shows excessive red shift in far SN, accelerating expansion. CMB evidence discredits excessive warping of space to fill critial energy density. Universe is essentially flat. Requires antigravitational effect, re Einstein's original equation cosmological constant. Show negative pressure with classical thermodynamics (vacuum energy associated with space) Friedmann equation governs expansion, define w factor (p/rho) as important to nature of dark matter Describe various theories with w values (Cos constant, quintessence, phantom energy(?)). Evaluate evidence for each, sum up The title of my essay is to critically analyse the evidence and compare theories. Do i have things in roughly the right order, am I missing anything crucial. I haven't officially covered any of this material yet in classes, so a formal knowledge is not necessarily required to be shown in the essay.