Stars and The Solar System

Science Class 8 : Chapter 17

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Quick Revision : Stars and The Solar System

  • Moon: Earth's natural satellite, shows phases due to reflected sunlight, no atmosphere or water.
  • Stars: Luminous celestial bodies that produce their own light. Sun is our nearest star.
  • Light Year: Distance light travels in one year (9.46 trillion km). Used for stellar distances.
  • Constellations: Groups of stars forming recognizable patterns (Ursa Major, Orion, Cassiopeia).
  • Solar System: Sun and all celestial bodies revolving around it (planets, moons, asteroids, comets, meteors).
  • Planets: Eight planets in order: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.
  • Asteroids: Rocky objects between Mars and Jupiter (asteroid belt).
  • Comets: Icy bodies with long tails when near Sun (Halley's comet every 76 years).
  • Meteors: Shooting stars - small objects burning in atmosphere. Meteorites reach Earth's surface.
  • Artificial Satellites: Man-made objects orbiting Earth (Aryabhatta, INSAT, IRS for communication, weather).

Questions

Chapter Summary : Stars and The Solar System

What You Will Learn: This chapter covers celestial objects, moon phases, stars and constellations, solar system members (planets, asteroids, comets, meteors), artificial satellites, and astronomical concepts like light years. It explains why we see different phases of the moon, how stars appear to move, and the organization of our solar system.

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