Correction to what I say at 5:26 mins: The supernovae that Permutter & Riess used were not all from the same direction of the sky, but the low-redshift ones were in one direction, while the high-redshift ones were in the other direction. So, same problem (skewed sample), same conclusion (they couldn't tell) but slightly different reason. Sorry about that blunder, I misread a figure. __ Last week I told you what dark energy is and why astrophysicists believe it exists. This week I want to tell you about a recent paper that claims dark energy does not exist! Dark energy determines the ultimate fate of our universe. If dark energy is real, the universe will expand faster and faster until all eternity. If there’s no dark energy, the expansion will slow down instead and it might even reverse, in which case the universe will collapse back to a point. I don’t know about you, but I would like to know what’s going to happen with our universe. The paper I am talking about is this one https://www.aanda.org/articles/aa/abs/2019/11/aa36373-19/aa36373-19.html https://arxiv.org/abs/1808.04597 The original Nobel-Prize winning paper is here https://iopscience.iop.org/article/10.1086/300499/pdf Support me on Patreon: https://www.patreon.com/Sabine