If you have ever had a medical checkup, you have probably heard about the Body Mass Index (BMI) that it supposed to have an optimal value around 25. Probably you were told to take your weight in pounds, divide it by the square of your height in inches and multiply the result by 703 to find your BMI.
Well, astronomers think there are large number of stars and guess (estimate) that there are around 1 septillion stars in the Universe1. If you look at the night sky, you can see around 3,000 stars with the naked eye. A galaxy is a group of hundreds of billions of stars that are relatively close to each other.
A reader asks: âHow many stars can I see in the night skyâ? The answer: âIt dependsâ¦â. If youâre looking with your unaided eye (without binoculars or a telescope), then in a big city with a lot of light pollution, you can see a few dozen of the brightest stars in the night sky. * * * Highly Recommended * * *.