During a solar eclipse, which object blocks sunlight from reaching Earth?

• A. The Moon
• B. The Sun
• C. The International Space Station
• D. The Earth

Answer: (A)

During a solar eclipse, the Moon moves directly between the Sun and the Earth, so it blocks the Sun’s light from reaching the Earth. The Sun is the light source, so it doesn’t block its own light in this setup; the Moon is the object that sits in the line of sight and casts a shadow on Earth. Sometimes that shadow is a full umbra, giving a total eclipse, or a partial shadow in the penumbra, giving a partial eclipse. The other options don’t fit this scenario: the Sun is what provides the light, the International Space Station is far too small and not in the right position to cast a significant shadow on Earth, and the Earth would be the receiver of light, not the blocker, in this arrangement.