• Rethinking Cosmology • Universe Expansion May Not Be Uniform 8.4.2020 • A new study using galaxy clusters examines whether the Universe is "isotropic," or the same in all directions. • Galaxy clusters are enormous structures that astronomers can use to measure important cosmological properties. • The latest result uses X-ray data from Chandra and XMM-Newton of hundreds of galaxy clusters. • The cluster observations suggest that the Universe may be different depending on which way astronomers l