with one estimate with one estimate with one estimate How Many Stars are in the Universe? How Many Stars are in the Universe? How Many Stars are in the Universe? with one estimate with one estimate with one estimate the observable universe with one estimate How Many Stars are in the Universe? with one estimate with one estimate How Many Stars are in the Universe? with one estimate How Many Stars are in the Universe? How Many Stars are in the Universe? with one estimate with one estimate with one estimate with one estimate two trillion galaxies How Many Stars are in the Universe? with one estimate with one estimate with one estimate with one estimate with one estimate