📖 Chapter 2 of 10 · Mysterious Space- Basic 1 · Class 5–6
Chapter 2: Why Does the Moon Change Its Shape?
Does the Moon make its own light?
No. The Moon does not make any light of its own. It shines because sunlight falls upon it and bounces back to our eyes, much like a mirror. When you see the Moon glowing, you are really seeing the Sun's light reflected from it.
Why does its shape seem to change?
The Moon travels around the Earth. As it moves, we see different amounts of its sunlit side — sometimes a thin curve, sometimes a half, sometimes a full circle. The Moon is not truly changing size; we are simply seeing more or less of its bright half.
A gentle note: “the Moon has its own light”
Some people say the Moon shines with its own light. It is easy to think so, because it glows so beautifully at night. But scientists have shown, and spacecraft have confirmed, that the Moon makes no light of its own — it only reflects the Sun's light. This does not make the Moon any less special. It simply helps us understand the sky a little better.
Story Time — The Growing Silver Smile
Meera · Kochi, Kerala
Meera lived beside the calm backwaters of Kochi, and she loved watching the Moon shine upon the water at night. One evening she saw a thin, curved Moon, like a silver smile, and she drew it in her notebook.
The next night the Moon looked a little wider. She drew it again. A few nights later it was half a circle, and a week after that it was a large, round, glowing full Moon. Meera looked at her drawings and wondered, “Is the Moon growing bigger and bigger?”
She went to her grandfather, who was mending his fishing net. “Appuppa, why does the Moon keep getting rounder?” He smiled kindly. “Sit, child. Let me tell you the Moon's secret.”
“The Moon has no light of its own,” he said. “It is not on fire like the Sun. It shines only because sunlight falls on it and bounces back to your eyes, like a mirror.” Meera's eyes grew wide. “A mirror in the sky?”
“Yes. And the Moon is always travelling around our Earth. Some nights we see only a thin sunlit sliver of it — that is your silver smile. Other nights we see its whole sunlit face — that is the full Moon. The Moon is not growing; you are only seeing different parts of its bright side.”
Meera looked again at her week of drawings, and at last she understood. They were not a growing Moon, but the same Moon showing her a little more of its face each night. She titled the page: “The Moon — a mirror that walks around the Earth.”
Story Time — The Sea That Listened to the Moon
Bhavesh · Puri, Odisha
Bhavesh helped his father with the fishing boat on the wide beach of Puri. He had noticed something for a long time but had never understood it. On some nights the sea crept far up the sand; on other nights it stayed low.
“Baba, why does the sea come so high tonight?” he asked, tying a rope. His father pointed to the large, round full Moon shining over the water. “Look there. When the Moon is full and bright, the sea rises higher. The Moon and the sea are old friends.”
“The Moon can move the sea?” Bhavesh asked. “In a gentle way, yes,” his father said. “The Moon is far away in space, yet it still gently pulls the water of our oceans. That is why the sea rises and falls each day. We call it the tide.”
That night Bhavesh watched the full Moon and the high, shining sea together, and it no longer seemed strange — it seemed wonderful. The same Moon that lit the sky was also gently moving the whole sea.
“So the Moon shines with the Sun's light,” Bhavesh said slowly, “and it also pulls our sea.” His father nodded. “The Moon may be far away, child, but it is a busy and useful neighbour.”
Solved Examples
Think first, then read the answer.
1. Does the Moon make its own light?
Show answer
Answer: No. The Moon shines because sunlight falls on it and bounces back to us, like a mirror.
2. Why does the Moon seem to change shape?
Show answer
Answer: As the Moon moves around the Earth, we see different amounts of its sunlit side on different nights.
3. Is the Moon really growing bigger each night?
Show answer
Answer: No. Its size stays the same. We only see more or less of its bright half.
4. What did Bhavesh learn the Moon does to the sea?
Show answer
Answer: The Moon gently pulls the ocean water, making the sea rise and fall. This is called the tide.
5. Why can we call the Moon a ‘mirror in the sky’?
Show answer
Answer: Because, like a mirror, it does not make light; it only reflects the Sun's light to us.
Check Your Understanding
A. Fill in the blanks
- The Moon shines with the _______'s light.
- The Moon travels around the _______.
- The rise and fall of the sea is called the _______.
B. Write True or False
- The Moon makes its own light. ( ___ )
- The Moon can look like a thin curve. ( ___ )
- The Moon can gently pull the sea. ( ___ )
C. Put in order (thin to full)
- Full Moon
- Thin curve
- Half Moon
D. Think and answer
- What shape was the Moon last night?
- Why is the Moon like a mirror?
- Have you ever seen the sea rise very high?
Check your understanding
Tap an answer to see if it is correct. This is just for fun — nothing is saved.
1. Why does the Moon shine?
- It is on fire
- It reflects the Sun's light
- It has a bulb
Show answer
B. It reflects the Sun's light
2. When do we usually see the Moon?
- At night
- At noon
- Never
Show answer
A. At night
3. Does the Moon really change size?
- Yes
- No, we see different sunny parts
- Only in summer
Show answer
B. No, we see different sunny parts