Beyond Earth Important Question Answer - Class 6 Science | Complete Learning Material PDF

Short Answer Questions:

Q1. Where do Yangdol and Dorjay live, and what do they enjoy about their surroundings?
Ans: Yangdol and Dorjay live in Nubra, a valley region in Ladakh, India. They enjoy the majestic mountain peaks and glaciers around them, the clean, thin air at high altitude and, most of all, the clear night sky filled with bright stars. They also like the quiet and peaceful feel of their neighbourhood, which makes the view of the sky even more beautiful.

Q2. Why is the night sky in Nubra so clearly visible?
Ans: The night sky in Nubra is very clear because of its high altitude and dry climate, which often results in almost cloudless weather. There is very little dust, smoke or artificial light there, so air and light pollution are minimal. This lack of haze and city lights makes faint stars and the Milky Way easy to see.

Q3. How do constellations help in navigation?
Ans: Constellations provide fixed patterns in the sky that people learned to recognise. Sailors and travellers used these patterns to find directions at night. For example, certain stars show the way to the North or help estimate the direction of East and West. In this way, constellations acted like a natural map for navigation before modern instruments were available.

Q4. What is the meaning of "constellation"?
Ans: A constellation is a group of stars that appear close together in the sky and form a recognisable shape or pattern. Different cultures gave these patterns names and connected them with myths, animals or objects, which helped people remember and use them.

Q5. How were constellations used in ancient times?
Ans: In ancient times, people used constellations mainly for navigation and time‑keeping. Sailors and travellers found directions using familiar star patterns. Farmers and communities also watched when certain constellations rose or set to know the season and the best time for sowing or harvesting. Constellations were therefore useful for both travel and daily life.

Q6. What is the Pole Star and why is it important?
Ans: The Pole Star, called Polaris, is a bright star that appears almost fixed in the northern sky. Because it stays nearly in the same position, it helps people find the North direction at night. For centuries, travellers and sailors have used Polaris as a reliable guide for orientation.

Q7. What are the Big Dipper and the Little Dipper?
Ans: The Big Dipper and the Little Dipper are two well‑known groups of stars visible in the northern sky. They are easy to spot and are used to help find other stars; for example, two stars in the bowl of the Big Dipper point towards Polaris. The Big Dipper is part of the constellation Ursa Major, while the Little Dipper is part of Ursa Minor.

Q8. What is light pollution and how does it affect our view of the night sky?
Ans: Light pollution is the brightening of the night sky caused by excessive artificial lights from street lamps, buildings and vehicles. It makes faint stars and other celestial objects hard to see, so people in towns and cities can only see a few of the brightest stars. Light pollution also affects wildlife and can disturb natural day–night cycles.

Q9. What is the Solar System, and what objects are included in it?
Ans: The Solar System consists of the Sun at its centre and all objects that orbit it. These include eight planets (Mercury to Neptune), their moons, and many smaller bodies such as asteroids, comets, dwarf planets (for example, Pluto) and countless pieces of rock and ice called meteoroids. Together these objects move around the Sun under its gravity.

Q10. What is the Milky Way Galaxy?
Ans: The Milky Way Galaxy is the vast collection of stars, gas and dust that contains our Solar System. It has billions of stars and looks like a faint, milky band across the sky when seen from a dark place. The Sun is just one of the many stars in this galaxy.

Long Answer Questions:

Q1. Explain how stars form constellations and the cultural significance of these patterns.
Ans: Constellations are patterns formed by stars as seen from Earth. Important points to note are: - Stars in a constellation may be very far apart in space, but from our view they appear close and form a shape. - People in different cultures connected these shapes with animals, heroes or objects and gave them names, which made it easier to remember the sky. - Constellations had practical uses: they helped with navigation and with knowing the seasons when certain stars rose or set. - They also held cultural and religious value, appearing in myths, stories and festivals. In this way, constellations became part of both practical life and cultural traditions.

Q2. How did people in ancient times use the stars for navigation?
Ans: Ancient people used the stars in several simple but effective ways: - They learned to recognise bright stars and familiar star patterns to find directions at night. - The Pole Star (Polaris) showed the direction of North in the northern hemisphere, which helped set a course. - Sailors used constellations to keep a steady direction across open seas and to estimate their position. - Observing which stars rose or set at certain times of the year helped people know the season and plan farming or journeys. These methods were reliable and essential before compasses, maps and modern instruments became common.

Q3. Discuss the role of the Sun in sustaining life on Earth.
Ans: The Sun is central to life on Earth for several simple reasons: - It provides light and heat, which keep the planet warm enough for living things. - Plants use sunlight to make food through photosynthesis, and this food forms the base of most food chains. - The Sun’s energy drives weather and the water cycle, such as evaporation and rain, which support plants, animals and human needs. - The changing position of the Sun during the year causes seasons, which affect when plants grow and when animals breed. Without the Sun’s steady energy, Earth would be cold and lifeless.

Q4. Describe the different types of planets in our Solar System.
Ans: Planets in our Solar System are grouped by their physical properties: - Inner planets (Mercury, Venus, Earth, Mars) are also called rocky or terrestrial planets. They are smaller, have solid surfaces and are closer to the Sun. - Outer planets (Jupiter, Saturn, Uranus, Neptune) are much larger and mostly made of gas or ices. Jupiter and Saturn are often called gas giants, while Uranus and Neptune are sometimes called ice giants. - Outer planets usually have many moons and some have visible ring systems. Each type formed under different conditions in the early Solar System, which explains their different sizes and compositions.

Q5. What are asteroids and comets, and how do they differ from planets?
Ans: Asteroids and comets are small bodies that orbit the Sun, but they differ from planets in several ways: - Asteroids are mainly made of rock and metal. Most are found in the asteroid belt between Mars and Jupiter and are irregular in shape and much smaller than planets. - Comets are made of ice, dust and frozen gases. When a comet comes close to the Sun, its ice warms and forms a bright tail of gas and dust that points away from the Sun. - Unlike planets, asteroids and comets do not clear their orbits of other debris and are not spherical in shape. Comets often come from distant regions like the Kuiper Belt or the Oort Cloud and may visit the inner Solar System only occasionally.