Galaxy clusters contain thousands of galaxies of all ages, shapes and sizes. Typically, they have a mass of about one million billion times the mass of the Sun and form over billions of years as smaller groups of galaxies slowly come together.The large mass of the galaxy cluster SDSS J0952+3434 creates the fascinating phenomenon of strong gravitational lensing.The cluster’s gravity bends light coming from behind it in a similar way to how the base of a wine glass bends light.The effects of this lensing can be clearly seen as an arc of light in the lower part of the new...