The formation of stars is a complex and fascinating process that has been studied by astronomers for centuries. One important question is why some stars are much bigger than others. A new study of starless cloud cores, the dense regions where stars form, has shed some light on this question.

The study, led by astronomer Stella Offner of the University of Texas at Austin, used data from the Atacama Large Millimeter/Submillimeter Array (ALMA) to observe 20 starless cloud cores in the Orion A molecular cloud complex. ALMA is a powerful telescope that can detect the faint light emitted by cold gas and dust in space.

The observations revealed that the starless cloud cores that are more massive are also more filamentary. Filaments are long, thin clouds of gas and dust that are thought to be the birthplaces of stars. The more massive starless cloud cores are also more likely to have multiple filaments.

Offner and her team believe that the filaments in starless cloud cores play a key role in determining the size of the stars that form in them. The filaments act as channels for gas and dust to flow into the central region of the cloud core, where the star forms. The more massive starless cloud cores have more filaments and therefore a greater supply of gas and dust, which can lead to the formation of more massive stars.

The findings of this study help to explain why some stars are much bigger than others. The mass of a star is largely determined by the amount of gas and dust available in the starless cloud core where it formed. The more massive starless cloud cores have a greater supply of gas and dust, which leads to the formation of more massive stars.