Unit 8 Lesson 1 What Are Planets and
- Slides: 12
Unit 8 Lesson 1 What Are Planets and Stars? Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? All Systems Go! • A planet is a large ball of rock or gas that moves around the sun. • The planet we live on is Earth. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? All Systems Go! • The sun, the planets, and the planets’ moons are parts of the solar system. • The eight planets in our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. • The planets look different. They are different sizes. They are different distances from the sun. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? All Systems Go! • What are the names of these planets closest to the sun? Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? All Systems Go! • What are the names of these planets farthest from the sun? Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? All Systems Go! • You can see some parts of the solar system only at night. • During the day, the parts are still there, but you cannot see them when it is light outside. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? The Center of Attention • The sun is the center of the solar system. • Earth and the other planets move in orbits around the sun. • An orbit is the path a planet takes as it moves around the sun. • It takes one year for Earth to make one orbit around the sun. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? The Center of Attention • Planets closer to the sun take less time to make an orbit around the sun. • Planets farther away take more time to make an orbit. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? The Center of Attention • Which planet takes the longest to travel around the sun? Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? Star Bright • A star is a huge ball of hot gases. The hot gases give off light and heat. • The star closest to Earth is the sun. The sun gives Earth light and heat. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? Star Bright • You can see the sun in the daytime, but most stars can be seen only at night. • Stars look like tiny points of light because they are so far away. Copyright © Houghton Mifflin Harcourt Publishing Company
Unit 8 Lesson 1 What Are Planets and Stars? Star Bright • Some stars form constellations. • A constellation is a group of stars that forms a pattern. • Orion and Canis Major are two constellations in the nighttime sky. Copyright © Houghton Mifflin Harcourt Publishing Company
