Life? With the present understanding of the age of the universe (acceleration and temperature), how long before the universe is cool enough to support our type of life? And If the Earth existed since the BB, how long would we see a red sky at night from the after glow of the big bang? I guess size and time would be important here. Quark star? If there is a quark star, What would the minimum mass of such a star be? Could light escape its surface?