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# Stellar Properties ## 2. Color and Temperature * **c.** Absolute Brightness: Brightness if all stars were the same distance from Earth. * **a.** Star color ranges from red (coolest) to blue (hottest). * **b.** Examples: * i. Sun: Yellow (5,700°C). * ii. Proxima Centauri: Red (2,300°C)....

# Stellar Properties ## 2. Color and Temperature * **c.** Absolute Brightness: Brightness if all stars were the same distance from Earth. * **a.** Star color ranges from red (coolest) to blue (hottest). * **b.** Examples: * i. Sun: Yellow (5,700°C). * ii. Proxima Centauri: Red (2,300°C). * iii. Vega: White (9,800°C). * iv. Alnilam: Blue (27,000°C). ## 3. Size * **a.** Many stars are medium-sized, like the Sun. * **b.** White Dwarf Stars: Size of Earth. * **c.** Red Giants/Supergiants: Large enough to fill the solar system up to Jupiter. ## 4. Mass * **a.** Low Mass Stars (Small Stars): * i. Survive for billions of years. * ii. Die quietly, leaving behind a white dwarf. * **b.** High Mass Stars (Large Stars): * i. Survive for a few million years. * ii. Die in a supernova explosion, leaving behind a black hole. ## Formation of Stars Stars form from huge clouds of gas and dust called nebulae. # Constellations ## 1. Definition * **a.** Constellations are imaginary patterns of stars that appear close together from Earth. * **b.** Stars in a constellation may actually be very distant from each other. ## 2. Cultural Significance * **a.** Many constellations have names traced back to early Babylonian and Greek civilizations. * **b.** Different cultures have their own names for constellations. * **c.** Example: Orion the Hunter (Greek) is called Tatlong Maria or Tres Marias in Filipino culture.