Which temperature scale has the highest value for the boiling point of water

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?