Did all of dark energy just vanish? A team of scientists have just analyzed new data and claim that we need to completely rethink its existence. This episode is supported by The Great Courses Plus. Go to http://ow.ly/EMoC304OIsh to start your free one month trial. Get your own Space Time t­shirt at http://bit.ly/1QlzoBi Tweet at us! @pbsspacetime Facebook: facebook.com/pbsspacetime Email us! pbsspacetime [at] gmail [dot] com Comment on Reddit: http://www.reddit.com/r/pbsspacetime Support us on Patreon! http://www.patreon.com/pbsspacetime Help translate our videos! null Why are we talking about dark energy again? Because another team has just announced a new analysis of updated supernova data. They claim that the data are consistent with there being NO dark energy – no accelerating expansion. They suggest that the universe may just be expanding at a constant rate – never speeding up, but also not slowing down. In this episode, Matt discusses this controversial claim, and whether or not we should throw away nearly twenty years of work on dark energy. Links to Sources Marginal Evidence for Cosmic Acceleration from Type Ia Supernovae J. T. Nielsen, A. Guffanti & S. Sarkar (2016) http://www.nature.com/articles/srep35596 Statistical hypothesis testing https://en.wikipedia.org/wiki/Statistical_hypothesis_testing Wolfram error analysis tutorial https://reference.wolfram.com/applications/eda/ExperimentalErrorsAndErrorAnalysis.html Previous Space Time Episode https://www.youtube.com/watch?v=ZY47bVu-0Bs Written and hosted by Matt O’Dowd Produced by Rusty Ward Graphics by Grayson Blackmon Made by Kornhaber Brown (www.kornhaberbrown.com) Comments Answered by Matt ThunderboltTangerine https://www.youtube.com/watch?v=dzKWfw68M5U QED https://www.youtube.com/watch?v=jowVq81AgGw Teboski78 https://www.youtube.com/watch?v=jowVq81AgGw