A presentation file about Stars and Galaxies

1. Stars and Galaxies
An Introduction to the Building
Blocks of the Universe

2. What Are Stars?
• • Luminous spheres of hot gas, primarily
hydrogen and helium
• • Generate energy through nuclear fusion
• • Examples: Sun, Sirius, Betelgeuse

3. Life Cycle of a Star
• • Nebula → Protostar → Main Sequence →
Red Giant/Supergiant
• • Ends as White Dwarf, Neutron Star, or Black
Hole

4. Types of Stars
• • Classified by spectral type: O, B, A, F, G, K, M
• • Differ in color, temperature, and size

5. What Are Galaxies?
• • Massive systems of stars, gas, dust, and dark
matter
• • Bound together by gravity

6. Types of Galaxies
• • Spiral (e.g., Milky Way)
• • Elliptical
• • Irregular

7. Galactic Structures
• • Galaxies contain star clusters, nebulae, and
planetary systems
• • Often found in galaxy groups or clusters