"The number of clusters observed at the present time, the so-called 'cluster abundance,' is very sensitive to cosmological conditions and, in particular, the total amount of matter." ...

"Scientists precisely measure total amount of matter in the universe." ScienceDaily. ScienceDaily, 28 September 2020. <www.sciencedaily.com / releases / 2020 / 09 / 200928125046.htm>.

Reporting in The Astrophysical Journal, the team determined that matter makes up 31% of the total amount of matter and energy in the universe, with the remainder consisting of dark energy.