How is the moon able to block the sun if it is so much smaller?

The moon can block the sun despite being much smaller because it is much closer to Earth. During a solar eclipse, the moon passes directly between the Earth and the sun, casting a shadow on Earth. The alignment of the sun, moon, and Earth allows the moon to cover the sun's disk from certain vantage points on Earth, creating the effect of the sun being blocked. This phenomenon is a result of the relative sizes and distances of the celestial bodies involved.