The mass of galaxies has been found by*1 pointCounting the stars it containsDetermining the gravitational force and speed of rotationEstimating the number of interstellar clouds it containsPut it on a triple beam balance and estimate to one decimal point beyond the smallest markingThere is no way to determine the mass of a galaxy... it is too big
Question
The mass of galaxies has been found by*1 pointCounting the stars it containsDetermining the gravitational force and speed of rotationEstimating the number of interstellar clouds it containsPut it on a triple beam balance and estimate to one decimal point beyond the smallest markingThere is no way to determine the mass of a galaxy... it is too big
Solution
The mass of galaxies is typically determined by observing their gravitational force and speed of rotation. This is because the gravitational force of a galaxy, which is directly related to its mass, influences the speed at which it rotates. By measuring this rotation speed, scientists can infer the mass of the galaxy. This method is more accurate and practical than counting the number of stars or estimating the number of interstellar clouds, which would be extremely difficult due to the vast size and complexity of galaxies. It is also not possible to physically weigh a galaxy on a balance due to its immense size and distance from Earth. Therefore, the best answer is "Determining the gravitational force and speed of rotation".
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