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EARTH AND SPACE TEKS 8.8A (R), 8.8B (S), 8.8C (S), 8.8D (S) © Hedgehog Learning If we were traveling at the speed of light, it would take us _________ to reach ________. 1 second Moon 8 minutes Sun 1 hour Saturn 4.2 years Nearest Star (Proxima Centauri) 6,500 years Crab Nebulae 26,000 years Center of the Milky Way 2,500,000 years Nearest galaxy (Andromeda) 93,000,000,000 years Other side of the universe © Hedgehog Learning Our own personal star Our solar system is extremely tiny compared to the Milky Way Galaxy. © Hedgehog Learning Stars © Hedgehog Learning The stars we see at night are located “nearby” in the Milky Way galaxy. Stars in other galaxies are too far away for us to see them individually. Stars have “life cycles” similar to plants and animals. Average stars, like our Sun, are born in nebulas and die as red giants. Brighter Models, like a Hertzsprung‐Russell diagram, show us how stars change over time. Based on this diagram, what would you say about the age of our Sun compared to other stars on the main sequence? © Hedgehog Learning Hotter Cooler Galaxies © Hedgehog Learning Our galaxy, the Milky Way galaxy, is made up of BILLIONS of stars. There are BILLIONS of galaxies in the universe. Types of galaxies include: • Spiral galaxies • Barred spiral galaxies • Elliptical galaxies • Dwarf galaxies • Ring galaxies © Hedgehog Learning © Hedgehog Learning © Hedgehog Learning I C © Hedgehog Learning E G B H F D A