Multiple views of the galaxy NGC 4254 as seen with the VLT and ALMA

This video shows images of NGC 4254, a grand-design spiral galaxy located approximately 45 million light-years from Earth in the constellation Coma Berenices, taken at many different wavelengths of light. The observations were conducted with the Multi-Unit Spectroscopic Explorer (MUSE) instrument on ESO’s Very Large Telescope (VLT) and the Atacama Large Millimeter/submillimeter Array (ALMA), in which ESO is a partner. The first two images are from the MUSE data. The first one, revealing the distribution of young stars, fades to a combined image that includes clouds of ionised hydrogen, oxygen and sulphur gas, marking the presence of newly born stars. The next image shows the ALMA data only. ALMA was used to map cold clouds of molecular gas, which provide the raw material from which stars form. Thousands of stars can form in just one of these molecular clouds, yet these stellar nurseries are invisible to the human eye — they can only be observed via the radio waves emitted by carbon monoxide (CO)