Question

1. the partial or total blocking of one object in space by another is called * 1 point

umbra
penumbra
eclipse
orbit

1. during a total lunar eclipse the moon is in earth’s ... * 1 point

umbra (total shadow)
corona
orbit
penumbra (partial shadow)

1. how long does a lunar cycle last? * 1 point

1 day
1 year
27 days
15 days

Explanation:

Question 18

• Umbra: The darkest part of a shadow, not the blocking event.
• Penumbra: The partial shadow, not the blocking event.
• Eclipse: Defined as the partial or total blocking of one celestial object by another (e.g., solar or lunar eclipse).
• Orbit: The path of an object in space, not a blocking event.

• Umbra (total shadow): During a total lunar eclipse, the Moon moves into Earth’s umbra (total shadow), causing total obscuration.
• Corona: The Sun’s outer atmosphere, not related to Earth’s shadow.
• Orbit: The path of the Moon, not a shadow region.
• Penumbra (partial shadow): Causes a partial lunar eclipse, not total.

• 1 day: Too short (Earth’s rotation period).
• 1 year: Earth’s orbital period around the Sun.
• 27 days: The lunar cycle (sidereal month) is about 27 days, representing the Moon’s orbit around Earth.
• 15 days: Incorrect; the lunar cycle is ~27 days.

Answer:

C. eclipse

Question 19