Astronomers at the LIGO (Laser Interferometer Gravitational-Wave Observatory), which primarily aims to measure gravitational waves, have for the second time detected waves based on the collision of two distant neutron stars. (Neutron stars are remnants of stars that are very dense, even though they are black holes.)
Scientists at LIGO have been detecting gravitational waves since last April. However, the source of these waves has yet to be determined. The two neutrons are much larger in mass than expected, so their impact / combination is significant, the statement said. This will give you a chance to learn how these new stars formed and how they may change over time.