Nutting, Darren, Sunil Mucesh, Mohammad Nahid Chowdhury, and Daniel Watters. “A6_7 Expansion of the Universe: A Darker Future”. Physics Special Topics 15, no. 1 (December 2, 2016). Accessed April 2, 2026. https://journals.le.ac.uk/index.php/pst/article/view/904.