In fact, astronomers have had theories about how massive the collapsing ball has to be in order to form a star for over 50 years. (keckobservatory.org)
Cenote Yax Bacaltun — Massive collapsed top cave cenote with a rope swing. (foodfuntravel.com)
Climate change could increase or, maybe even more likely, decrease the probability of such massive collapses. (earthobservatory.nasa.gov)