How do astrophysicists actually know that once a cloud of gas becomes big enough, it collapses into a star? Such a process has never been observed. No one has replicated this in a lab at any scale.
>>16865958it just does chud
>>16865958>once a cloud of gas becomes big enough, it collapses into a star Inaccuracies in that statement aisde, we see nebulae at various stages in this process and can infer order on first principles.Massive objects attract other massive objects. As the mass increases, so does this attraction. Snowball effect ensues until attractive force is strong enough for fusion to occur.This is the most likely series of events based on what we see and what we know.
>>16865958idk lol
>How do astrophysicists actually know that once a cloud of gas becomes big enough, it collapses into a star?You can observe star formation at different phases. There are giant molecular clouds in the Galaxy which have not yet begun star formation, but they are far more dense than than any other gas. Their cores are also very cold, tens of Kelvin. Then you have star forming regions (like Orion) where there are both huge numbers of hot young stars and regions of cold gas. The hot young stars ionize the gas creating a huge nebula. You also find large numbers of stars which have not yet moved on to the main sequence of stellar evolution, and stars with proto-planetary disks. Star forming regions like Orion are not gravitationally bound, one can measure some of the stars moving apart. In millions of years it will resemble an open cluster like the Pleiades, which slowly move apart on even longer timescales to mix with the rest of the Galaxy.> No one has replicated this in a lab at any scale.No one has made a Moon in the lab, and yet the tides still exist. Lab experiments tell you nothing about the universe on large scales and long timelines. One needs to embrace observational evidence and combine it with theory.
