* Start with the number: 200,000,000,000
* Move the decimal point to the left until you have a number between 1 and 10: 2.00000000000
* Count the number of places you moved the decimal: 11 places
* Express the number of places moved as a power of 10: 10^11
Therefore, the scientific notation for at least 200,000,000,000 stars in Andromeda is 2 x 10^11 stars.
