What causes interstellar dust and gas to start to contract and form a protostar? 1) the shockwave from a supernova 2) nearby black hole 3) an increase in the solar wind 4) nuclear fusion

I’m pretty sure the answer is 3

The shockwave from a supernova

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.

The next element is345640