開普勒係一台太空望遠鏡 當星體喺恆星前面經過 會輕微阻擋恆星嘅光線 令恆星睇起嚟暗啲 開普勒就係量度呢啲稍為暗淡嘅光線
Kepler is a space telescope, when a star passes in front of a star, it slightly blocks the star's light, making the star appear dark, and Kepler measures these slightly fainter rays