These may allow us to sense primordial gravitational waves from the very young universe. (newscientist.com)
Similarly, in the 1990s the expansion rate implied too young a universe because dark energy was not then known to exist and therefore was not taken into account when calculating the universe's age. (sciencenews.org)
Reverberations in the very young universe imprinted onto that background a discernible pattern, which depends on the mix of ordinary matter to dark matter. (discovermagazine.com)