The universe still has the ingredients to make stars, so why has star formation fallen so dramatically? Scientists uncover a cosmic puzzle

Galaxies are forming significantly fewer stars than in the past. New research indicates hydrogen fuel remains abundant in these galaxies. Star formation has declined much faster than the available neutral hydrogen. This suggests a problem in converting hydrogen into star-forming material. The universe's star-making machinery has become less efficient over time.

Raccontata daeconomictimes.indiatimes.com