<![CDATA[ Using gravitational waves as a measure of the universe's rate of expansion could solve the biggest headache in physics, the so-called "Hubble tension." ]]>
Hubble tension refers to the discrepancy between different measurements of the universe's expansion rate, known as the Hubble constant. This tension arises from the differing results obtained through observations of distant supernovae and the cosmic microwave background radiation.
Gravitational waves are ripples in spacetime caused by the acceleration of massive objects, such as merging neutron stars or black holes. They provide a new way to observe the universe and can carry information about their origins and the nature of gravity.