Answer:The number of stars in the Milky Way is estimated to be 100 thousand million, which can be written as 100,000,000,000. This number has 11 significant figures.
A significant figure is a digit in a number that is used to express the precision of that number. It includes all of the digits that are known with certainty, as well as the first uncertain digit. In the number 100,000,000,000, all of the digits are known with certainty, so they are all significant figures.
In scientific notation, the number 100,000,000,000 would be written as 1.0 x 10^11. In this notation, the coefficient 1.0 has two significant figures (the 1 and the 0), and the exponent 11 does not represent a significant figure.
Step-by-step explanation: