Q1. Fill in the blank:
The phenomenon where the Sun, Earth, and Moon align to cause a total or partial shadow is called a ______.
- (a) Eclipse
- (b) Transit
- (c) Conjunction
- (d) Revolution
Answer & solution
Answer: (a) Eclipse
An eclipse occurs when the Sun, Earth, and Moon align such that one celestial body passes into the shadow of another. A solar eclipse occurs when the Moon comes between the Sun and Earth, casting a shadow on Earth. A lunar eclipse occurs when Earth comes between the Sun and Moon, casting Earth's shadow on the Moon. Both are characterized by the alignment described in the question.
Option 2 (Transit): A transit is when a smaller body (like Mercury or Venus) passes across the face of the Sun as seen from Earth — a different phenomenon.
Option 3 (Conjunction): Conjunction refers to when two celestial objects appear close together in the sky; does not necessarily cause shadows.
Option 4 (Revolution): Revolution is the orbital movement of a body around another (e.g., Earth around the Sun); it is not a shadow-causing phenomenon.