Most of the massive stars in the universe were originated in enormous star clusters. These clusters are the building blocks of galaxies, but their formation from dense molecular clouds remains obscure.

Now, astronomers have created a stunning image showing celestial fireworks in star cluster G286.21+0.17 that is located in the Carina region of our galaxy, about 8000 light-years away. The cluster was caught in the act of formation.

Astronomers created a multi-wavelength mosaic made out of more than 750 individual radio observations with the Atacama Large Millimeter/submillimeter Array (ALMA) and nine infrared images from the NASA/ESA Hubble Space Telescope.