Black surfaces is you'r answer. or dark mater. ya those are you'r answer.
Answer:
heterogeneous mixture has components that are not evenly distributed. This means that you can easily distinguish between the different components.
As the container starts to heat up, so will the neon gas. Heat is nothing but energy, and when you add energy to a gas, it will start vibrating much faster and hit the edges of the container at a higher rate and a faster velocity. Therefore, it's possible to deduce that the container will most likely rupture and/or "explode".