Summary

Key Points Recap:

Stars and Constellations:

• Stars shine with their own light
• 88 official constellations divide the entire sky
• Pole Star helps find North direction
• Ancient navigation tool

Solar System Objects:

• Sun: Our closest star, source of energy
• 8 Planets: Mercury to Neptune in order
• Moon: Earth’s satellite, 27-day orbit
• Other objects: Asteroids, comets

Beyond Solar System:

• Milky Way Galaxy: Our home galaxy
• Universe: Contains countless galaxies
• Search for life: Ongoing on exoplanets

Navigation Tips:

• Big Dipper → Pole Star: Use cup stars to locate North
• Orion’s belt → Sirius: Follow the line eastward
• Venus: Brightest planet, visible at dawn/dusk

🧪 Important Terms

🔸 Key Definitions

• Revolution: Movement of an object around the Sun
• Astronomical Unit (AU): Distance between Sun and Earth (≈ 150 million km)
• Satellite: Objects that move around planets
• Constellation: Groups of stars forming patterns
• Light Pollution: Excessive artificial light affecting night sky visibility