Our sun is 2.3 × 104 (light years) from the center of our milky way galaxy and is moving in a circle around that center at a speed of 250 / one light year is the distance like travels in one year. if the speed of light is 2.998 × 108 m/ how long does it take the sun to make one revolution about the galactic center? b) how many revolutions has the sun completed since it was formed about 4.5 × 109 years ago? take one year as 365 days for your calculations.

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !