1. <span>the process started with the collapse of a nebula
The universe almost certainly didn't start from the collapse of a nebula.
2. The mantle is the middle layer.</span>
The reason why the US had the nuke in Turkey was because Turkey had arrested several of the U.S citizens accused of abetting the coup ...
Answer: Probably, harder the mineral it scratches. It makes more sense.
The correct answer is - temperature.
We see the stars on the night sky in multiple colors, and the variation in the colors of the stars comes from the differences in temperature. The cooler a star is, the more reddish it appears, the hotter the star is the more blueish or whitish they appear. From cool to hot, the stars can appear in the variations of red, orange, yellow, green, blue/white colors, and it is an easy indicator of the temperature of them.