Cannon and her mom looked at the stars when she was little. This is what got Cannon interested in stars. She loved the stars. Cannon was born in the US and lived there most of her life. She lived 78 years. Cannon observed and then classified about 400,000 stars. She also came up with the Harvard system. The Harvard system surveyed stars according to the color of light emission and temperature. Cannon was a great astronomer and gave us new information about the stars.