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.
Whatâs That Very Bright Star â Is it the Planet Jupiter? Have you seen a very bright star rising in the East every night the past few months? If youâre a night owl, you may have noticed it moves across they sky from the East into the West, shining brightly throughout the night. However this object is not a star! Itâs the planet Jupiter and it is the brightest object in the night sky at the moment, apart from the Moon. At the end of October Jupiter will be at opposition.