📖 Chapter 2 of 12 · Mysterious Space- Basic 2 · Class 7
Chapter 1: The Sun's Great Family: The Solar System
What is the Solar System?
The Sun is not alone in space. It has a great family of eight planets that travel around it, along with many moons, and smaller bits of rock and ice. This whole family, held together by the Sun, is called the Solar System. Our Earth is one of these eight planets.
Meet the eight planets
In order from the Sun, the planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. The four nearest the Sun are smaller and rocky, like the Earth. The four farthest are giant balls of gas and ice. Saturn is famous for its beautiful rings, and Jupiter is the largest planet of all.
A gentle note: “Pluto is the ninth planet”
Many of us were taught that there are nine planets, with Pluto as the ninth. That is why you may still hear it. In 2006, scientists studied Pluto carefully and decided it is better called a ‘dwarf planet’, because it is very small and shares its part of space with other icy bodies. So today we count eight planets. Pluto is still there, still interesting — it simply has a new and more fitting name.
Story Time — The Family Portrait
Meera · Kochi, Kerala
Meera, who had once kept a diary of the changing Moon, now had a new project at school: to build a model of the Solar System. She spent an evening rolling balls of clay of every size, from a tiny grain for Mercury to a great fat ball for Jupiter.
As she painted them, her grandfather watched with interest. “Why are you making so many balls?” he asked. “They are the planets, Appuppa,” Meera said. “Eight of them. They all travel around the Sun, each on its own path. Together they are called the Solar System — the Sun's family.”
“And where are we?” he asked, smiling. Meera held up the third ball from the Sun, a small blue-and-green one. “This is us. This is the Earth.” Her grandfather looked at the little clay ball for a long moment. “So everything we have ever known — our home, our country, the whole sea outside — is on that one small ball?”
“Yes,” said Meera. “And the Sun is so much bigger than all of them. If the Sun were the size of a football, the Earth would be smaller than a peppercorn.” Her grandfather shook his head in wonder. “We are a very small part of a very large family.”
When Meera carried her finished model to school, her teacher hung it from the ceiling, with the Sun in the middle and the eight planets circling around. The whole class gathered beneath it, looking up, and for a moment they were not in a classroom in Kochi at all — they were standing in space, looking at the Sun's great family.
Story Time — The Planet with a Thousand Rings
Ishaan · Nagpur, Maharashtra
At a science fair in Nagpur, Ishaan waited in a long line for one thing only: a turn at the big telescope. A scientist had set it up and pointed it carefully at a bright dot in the evening sky. “What are we looking at?” Ishaan asked when his turn came.
“Look and see,” the scientist said. Ishaan closed one eye and peered in — and gasped. There, small but perfectly clear, was a golden ball with a bright ring around it. “It has a ring! A real ring!” “That is Saturn,” the scientist said. “The rings are made of countless pieces of ice and rock, all circling the planet.”
“Can I really be seeing it myself? Not a photo?” Ishaan asked. “The light in your eye right now,” the scientist said, “left Saturn more than an hour ago and travelled across space to reach you. You are seeing the real Saturn.”
Ishaan stepped back so others could look, but he could not stop smiling. He had seen, with his own eyes, a planet so far away that its light took an hour to arrive. “There are eight planets,” the scientist added. “Each one is different. Saturn has rings, Jupiter is a giant, Mars is red. Our Solar System is full of wonders.”
That night Ishaan wrote in his notebook: “Today I looked past the sky and saw another world.” He decided he would look through that telescope as often as he could, for there were seven more planets waiting.
Solved Examples
Think first, then read the answer.
1. What is the Solar System?
Show answer
Answer: It is the Sun together with its family — the eight planets, their moons, and smaller rocks and ice — all held around the Sun.
2. How many planets are there, and which is ours?
Show answer
Answer: There are eight planets. Ours is the Earth, the third from the Sun.
3. Which planet is famous for its rings?
Show answer
Answer: Saturn is famous for its beautiful rings, made of ice and rock.
4. Which is the largest planet?
Show answer
Answer: Jupiter is the largest planet in the Solar System.
5. Why did Ishaan's view of Saturn show light over an hour old?
Show answer
Answer: Because Saturn is so far away that its light takes more than an hour to travel across space to the Earth.
Check Your Understanding
A. Fill in the blanks
- The Sun and its planets are together called the _______ System.
- There are _______ planets.
- _______ is famous for its rings.
B. Write True or False
- The Earth is one of the eight planets. ( ___ )
- The Sun travels around the Earth. ( ___ )
- Jupiter is the largest planet. ( ___ )
C. Put the planets in order (from the Sun)
- Earth
- Mercury
- Venus
D. Think and answer
- Why is the Earth called a ‘rocky’ planet?
- If the Sun were a football, how big would the Earth be?
- Which planet would you most like to visit, and why?
Check your understanding
Tap an answer to see if it is correct. This is just for fun — nothing is saved.
1. What is the Solar System?
- Only the Sun
- The Sun and its family of eight planets
- A single star
Show answer
B. The Sun and its family of eight planets
2. How many planets are there?
- Eight
- Nine
- Five
Show answer
A. Eight
3. Which planet is famous for its rings?
- Mars
- Saturn
- Mercury
Show answer
B. Saturn