Chapter: 15. The Solar System
Section A: Multiple Choice Questions
Section B: Fill in the Blanks
Section C: True or False
Section D: Short Answer Questions
A “living planet” is a planet that has conditions suitable for life to exist and thrive. Earth is called a living planet because it has air, water, and receives the right amount of heat and light from the Sun, all necessary for life. Stars look small to us even if they are much bigger than the Sun because they are incredibly far away from Earth. The immense distance makes them appear as tiny points of light. The two heavenly bodies that are satellites are natural satellites (like the Moon) and artificial satellites. It takes Earth $365 \frac{1}{4}$ days to complete one orbit around the Sun. Section E: Diagram-Based Questions
Question 1:
The two planets shown in the picture are Saturn (the one with prominent rings) and Jupiter (the larger, striped one with a red spot). One distinct difference visible in the image is that Saturn has a prominent system of rings made of ice crystals around it, while Jupiter does not have such rings. Jupiter is known to have the maximum number of moons among all the planets in our solar system. Question 2:
These specific patterns of stars are called constellations. The two constellations clearly highlighted by lines in the image are Orion and Ursa Major (also known as the Great Bear). Thousands of stars, like those forming these patterns, belong to a larger group called a galaxy. Our solar system itself belongs to the Milky Way galaxy. Section F: Long Answer Questions
The solar system is a vast system consisting of the Sun, which is its central star, and all the heavenly bodies that travel around it. This includes eight planets, each orbiting the Sun in a fixed path. Additionally, it comprises the natural satellites (moons) that orbit these planets, as well as various pieces of rocks, dust, and gases scattered throughout. The Sun plays a crucial role as it is the source of all heat and light in the solar system, making life possible on Earth and influencing the movements of all other celestial bodies. Stars are heavenly bodies that produce their own heat and light because they are made of hot burning gases, whereas planets are heavenly bodies that do not produce their own light but reflect light from a star as they orbit it. Many stars are actually much larger than our Sun, but they look small to us because they are incredibly far away from Earth. Planets, being much closer to us, appear larger and can be observed with more detail. Section G: Differentiate Between
A Pole Star is a specific, brightest star in the northern part of the sky that is used for navigation, helping observers easily find other directions. In contrast, other stars visible in the night sky are numerous and vary in brightness and location, but they do not serve as a fixed directional point like the Pole Star. 
Answer key