Is our model of the universe wrong?

For the past 10 years cosmologists have been left scratching their
heads over why two methods for measuring the universe’s rate of
expansion provide totally different results. There are two possible
solutions to the puzzle, known as the Hubble tension: either
something is wrong with the measurements or something is wrong with
our model of the universe. It was hoped that observations from the
James Webb space telescope might shed some light on the problem,
but instead results published last week have continued to muddy the
waters. To understand why the expansion rate of the universe
remains a mystery, and what might be needed to finally pin it down,
Madeleine Finlay speaks to Catherine Heymans, the astronomer royal
for Scotland and a professor of astrophysics at the University of
Edinburgh. Help support our independent journalism at
theguardian.com/sciencepod