Class 8 Exam > Class 8 Videos > Stars and Solar System - Class 8 Science
Stars and Solar System - Class 8 Science Video Lecture
FAQs on Stars and Solar System - Class 8 Science Video Lecture
| 1. What is a star? |  |
Ans. A star is a massive, glowing ball of gas held together by its own gravity. It emits light and heat through the process of nuclear fusion, where hydrogen nuclei combine to form helium. Stars come in various sizes, colors, and temperatures, and they play a crucial role in the formation and evolution of galaxies.
| 2. How many stars are there in the solar system? | |
Ans. The solar system consists of one star, which is the Sun. The Sun is a medium-sized star located at the center of the solar system. It provides heat, light, and energy to the planets and other celestial objects orbiting around it. Apart from the Sun, there are no other stars present within the boundaries of our solar system.
| 3. How are stars formed? | |
Ans. Stars are formed from vast clouds of gas and dust called nebulae. These nebulae collapse under gravity, causing the gas and dust particles to come together and form a dense core known as a protostar. As the protostar continues to accumulate mass, its core becomes hot and dense enough for nuclear fusion to begin. This fusion process ignites the star, and it starts emitting light and heat, becoming a fully-fledged star.
| 4. Can planets be considered as stars? | |
Ans. No, planets cannot be considered as stars. While both planets and stars are celestial objects, they have distinct characteristics. Stars are massive, self-luminous bodies that produce their own light and heat through nuclear fusion. Planets, on the other hand, are much smaller objects that do not produce their own light but reflect light from the star they orbit, such as the Sun in the case of our solar system.
| 5. How do scientists study stars and the solar system? | |
Ans. Scientists study stars and the solar system through various methods and instruments. They use telescopes to observe and analyze the light emitted or reflected by celestial objects. Different types of telescopes, such as optical telescopes, radio telescopes, and space telescopes, provide valuable data about stars, planets, galaxies, and other cosmic phenomena. Additionally, space missions and probes are sent to explore and gather information about the solar system, such as the Voyager and Mars rovers.
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Nov 15, 2024 Last updated |
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