What a dark energy discovery means for the fate of the universe

Dark energy, the mysterious force powering the expansion of the
universe, appears to be weakening over time, according to a major
cosmological survey that has thrown the laws of modern physics into
doubt. Ian Sample tells Madeleine Finlay how this new finding could
shed light on the ultimate fate of the cosmos, and Saul Perlmutter,
who won a Nobel prize for his work proving the universe is
expanding, describes how the new development could upend
assumptions about how this mysterious force operates. Help support
our independent journalism at theguardian.com/sciencepod