Class 6 Science Chapter 12 Extra Questions and Answers Beyond Earth
NCERT Class 6 Science Chapter 12 Beyond Earth Important Extra Questions and Answers
Stars and Constellations Class 6 Extra Questions
Question 1.
What is a constellation?
Answer:
A constellation is a group of stars that form a recognizable pattern in the sky.
Question 2.
What is a shooting star?
Answer:
A shooting star is actually a meteor burning up in Earth’s atmosphere, causing a streak of light in the sky.
Question 3.
Which is the closest star to the Earth?
Answer:
The Sun is the closest star to the Earth.
Question 4.
Which star is nearest to us after the Sun?
Answer:
Proxima tentauri is the star nearest to us after the Sun.
Question 5.
Which is the brightest star in the night sky?
Answer:
Sirius is the brightest star in the night sky.
Question 6.
A star is ten light years away from the earth. Suppose it brightens up suddenly today. After how much time shall we see this change?
Answer:
We will see the change seen after 10 years.
Question 7.
Which device is used to observe faint stars which are not visible to the naked eye?
Answer:
Powerful telescopes are used to observe faint stars that are not visible to the naked eye.
Question 8.
Which are the four main stars we know?
Answer:
Sun, Proxima Centauri, Alpha Centauri and Sirius.
Question 9.
What is the distance between the Sun and the Earth?
Answer:
The distance of the Sun from the Earth is about 150 million km.
Question 10.
What is Universe?
Answer:
The Universe is a large space consisting of celestial bodies like the stars, planets, galaxy, dust and gases.
Question 11.
What causes stars to rise and set?
Answer:
This occurs due to Earth’s rotation which is spinning around its own axis.
Question 12.
Identify the following constellations:
Answer:
(a) Ursa Major/Big Dipper
(b) Ursa Minor/Little Dipper
Question 13.
What are the other names of Pole Star?
Answer:
Polaris/Dhruv Tara/ North Star/ Guiding Star are the other names of Pole Star.
Question 14.
How do astronomers use constellations?
Answer:
Astronomers use constellations as a way to identify and- locate stars and other celestial objects in the night sky, aiding navigation and observation.
Question 15.
Do stars emit light only during night?
Answer:
No, they emit light all the time.
Our Solar System Class 6 Extra Questions
Question 1.
What is meant by the ‘Solar System’?
Answer:
The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids form the solar system.
Question 2.
How does a planet differ from a star?
Answer:
| Planet | Star |
| The celestial bodies which revolve around the sun in certain orbit are called planets. | Stars are the celestial bodies which can emit heat and light continuously. |
| Planets do not twinkle in the sky. | Stars twinkle in the sky. |
| They do not have their own light. | They have their own light. |
| They revolve around the sun. | They are fixed at a point. |
| Planets are small as compared to stars. | They are veiy big in size. |
Question 3.
Why is the Earth called a unique planet?
Answer:
The earth is a unique solar system planet because:
(a) Conditions favorable to supporting life are only to be found on earth.
(b) The earth is neither too hot nor too cold.
(c) There are water and air in it, which are very important for our survival.
Question 4.
Why is the Earth called a blue planet?
Answer:
From the outer space, the earth appears blue because its three- fourths surface is covered by water. It is, therefore, called a blue planet.
Question 5.
Why is the Sun important to our life?
Answer:
Sunlight is essential for plants to grow, which provide food and oxygen to animals, including humans. The Sun is responsible for climate, seasons, weather, water cycle, winds—all of which are important for sustaining life on the Earth.
Question 6.
What is revolution?
Answer:
The motion of the earth around the sun in its orbit is known as revolution.
Question 7.
Which galaxy is our solar system part of?
Answer:
Our solar system is in the Milky Way Galaxy.
Question 8.
Which planet is the hottest in our solar system?
Answer:
Venus is the hottest planet in our solar system.
Question 9.
How many planets in the solar system are made of gas? Name them.
Answer:
Four planets are made out of gas and they are also referred to as gas giants. They are Jupiter, Saturn, Uranus, and Neptune.
Question 10.
What do planets in the solar system orbit around?
Answer:
The planets orbit around the Sun.
Question 11.
Why is Moon not considered a planet?
Answer:
The Moon isn’t a planet because it orbits the Earth.
Question 12.
Which planet is known as the “Red Planet” and why?
Answer:
Mars is called the Red Planet because it appears red. This is because the soil on Mars is reddish in colour.
Question 13.
Which planet is called “morning or evening star and why?
Answer:
Venus is usually seen shining brightly at dawn and dusk, and is commonly called the Morning Star or the Evening Star, even though it is not a star,
Question 14.
What is a Dwarf Planet?
Answer:
A small sized celestial body that revolves independently around the sun is called the dwarf planet.
Question 15.
When is ‘National Space Day’ celebrated in India?
Answer:
‘National Space Day’ is celebrated on August 23rd every year.
Question 16.
Why is Jupiter called the Stormy Planet?
Answer:
Jupiter revolves around itself with a great speed; hence Jupiter is called the Stormy planet.
Question 17.
What are artificial satellites used for?
Answer:
Artificial satellites are used for weather forecasting, long distance communication and remote sensing.
Question 18.
What is the other name of inner planets and name them?
Answer:
Inner planets are also called Terrestrial planets, They are – Mercury, Venus, Earth and Mars.
Question 19.
What is the other name of outer planets and name them?
Answer:
Outer planets are also called Jovian planets. They are- Jupiter, Saturn, Uranus and Neptune.
Question 20.
Why is Venus called the Twin Planet?
Answer:
Venus is considered as ‘Earth’s-twin’ because its size and shape are very much similar to that of the earth.
Question 21.
Suppose the distance between earth and sun becomes half of its present distance.
What is likely to happen to life?
Answer:
Life as we know it would cease. Radiation hitting the earth, including sunlight would increase by a factor of 4.
Perhaps there would be a small area near the poles where some life could exist, but everywhere else would be lifeless due to the quadrupled radiation.
The Milky way Galaxy Class 6 Extra Questions
Question 1.
What is a galaxy?
Answer:
A galaxy is a huge system of billions of stars, and clouds of dust and gases.
Question 2.
What is the shape of the Milky Way Galaxy?
Answer:
Our Milky Way Galaxy is a spiral galaxy having a whitish broadand. It looks like a spinning pinwheel
when viewed from top or bottom.
Question 3.
What is the other name of Milky Way Galaxy?
Answer:
Milky Way galaxy is often known as Akash Ganga.
Question 4.
Why is our galaxy calledMilky Way?
Answer:
Our galaxy is called the Milky Way because it appears as a milky hand of light in the sky when we see it in a
really dark area.
The Universe Class 6 Extra Questions
Question 1.
Define Universe.
Answer:
The Universe is a large space consisting of celestial bodies like the stars, planets, galaxy, dust and gases.
Question 2.
Which one of the following is arranged in order from biggest to smallest?
(a) Galaxy, Universe, solar System, Star, Planet
(b) Universe, Solar System, Galaxy, Planet, Star
(c) Solar System, Universe, Galaxy, Star, Planet
(d) Universe, Galax, Solar System, Star, Planet
Answer:
(d)
Question 3.
What is the scientific study of universe called?
Answer:
The scientific study of universe is called Astronomy.
Question 4.
What Is the name of the successful mission by Indta which demonstrated end-toend capability in safe landing and roving on the lunar surface?
Answer:
Chandrayaan-3 demonstrated end-to-end capability in safe landing and roving on the lunar surface.
Question 5.
What Is the name of Chandrayaan3 mission’s lander and the rover?
Answer:
Chandrayaan 3 mission’s lander is named Vikram and the rover Pragyan.