Astr 205 Final 166 Correctly Answered Questions Latest Update

What is the diameter of the largest asteroid in our solar system, Ceres? {Ans: 940km, Ceres is also classified as a dwarf planet due to its size.}What is the most important reason why we need the ozone layer above us? {Ans: Protection from harmful UV radiation.}If there are about 6000 stars in the entire sky which can be seen by the unaided human eye, about how many stars would be seen at a particular instant on a given dark night from a single location with an uninterrupted distant horizon? {Ans: 3000}What is the Parallax method? {Ans: Used to measure the distance to nearby stars. From different vantage points the shift in the position of the star is its parallax angle. The amount of parallax depends on the distance of the star. Knowing parallax angle and baseline, you can calculate star distance.}What do cosmologists study? {Ans: The origin, structure, and evolution of the universe}What is the most important process causing a protostar to stop accreting mass? {Ans: Increasing pressure due to gas getting hotter and hotter because of gravitational compression}