1. Unit 2 Lesson 1 What Objects Are Part of the Solar System? Copyright © Houghton Mifflin Harcourt Publishing Company

2. Unit 2 Lesson 1 What Objects Are Part of the Solar System? Florida Benchmarks Copyright © Houghton Mifflin Harcourt Publishing Company SC.5.E.5.2 Recognize the major common characteristics of all planets and compare/contrast the properties of inner and outer planets. SC.5.E.5.3 Distinguish among the following objects of the Solar System—Sun, planets, moon, asteroids, comets — and identify Earth’s position in it.

3. Unit 2 Lesson 1 What Objects Are Part of the Solar System? The Solar System Copyright © Houghton Mifflin Harcourt Publishing Company Earth, other planets, and moons are part of a solar system. Solar systems are made up of a star and the planets and other space objects that revolve around it. Planets are large, round bodies that revolve around a star.

4. Unit 2 Lesson 1 What Objects Are Part of the Solar System? The Solar System Copyright © Houghton Mifflin Harcourt Publishing Company There are eight planets in our solar system. All planets rotate, or spin, around an axis. An axis is an imaginary line that goes through the center of the planet.

5. Unit 2 Lesson 1 What Objects Are Part of the Solar System? The Flying Objects Copyright © Houghton Mifflin Harcourt Publishing Company Moons in our solar system differ from each other. Some moons may contain a lot of ice. Some moons have many volcanoes. Moons

6. Dwarf Planets Pluto was once classified as a planet. Now it is classified as a dwarf planet. Dwarf planets are nearly round bodies whose orbits cross the orbits of other bodies. Dwarf planets are very far away and hard to study. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 1 What Objects Are Part of the Solar System?

7. Asteroids Asteroids are rock and iron objects that orbit the sun. Millions of asteroids are found in the wide region between Mars and Jupiter known as the asteroid belt. Asteroids range in size from as small as a city block to the size of an ocean. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 1 What Objects Are Part of the Solar System?

8. Meteoroids, Meteors, and Meteorites Meteoroids are pieces of rock that break off asteroids and travel through space. Meteor is a term used to describe the streak of light caused when a meteoroid burns up in Earth’s atmosphere. If a meteoroid reaches Earth’s surface, it is called a meteorite. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 1 What Objects Are Part of the Solar System?

9. Comets A chunk of frozen gases, rock, ice, and dust is known as a comet. As comets pass close to the sun, part of the frozen surface breaks away and turns into gases and dust. These particles reflect sunlight and look like long tails that always point away from the sun. Copyright © Houghton Mifflin Harcourt Publishing Company Unit 2 Lesson 1 What Objects Are Part of the Solar System?

10. Space Watch Copyright © Houghton Mifflin Harcourt Publishing Company Objects such as comets, meteoroids, and asteroids can hit the surface of other bodies in the solar system. The impact, or hit, from space objects creates impact craters. Scientists keep track of the size, position, and motion of space objects near Earth using telescopes.