Summary:
- This article discusses the discovery of an "Einstein cross" - a rare gravitational lensing effect where a single distant galaxy appears as four separate images around a closer galaxy.
- The Einstein cross was observed using the Atacama Large Millimeter/submillimeter Array (ALMA) telescope, providing new insights into the distribution of dark matter in the lensing galaxy.
- The observations suggest that the lensing galaxy contains a significant amount of dark matter, which is an invisible form of matter that makes up a large portion of the universe but is not well understood.