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CHAPTER 6: The SOlar System 

Lesson 1: The Sun 
Main Idea 5.ES.5.a
The Sun, which is made
mostly of hydrogen and
helium, is at the center of
the solar system and is the
largest object in the solar
system.
The Sun is a star and the
largest object in the solar
system.
The Sun produces energy
when hydrogen combines
to form helium and energy.
Vocabulary 
  • star
  • astronomical unit
  • fusion

Resources
Constellations 
Types of Stars 
Textbook Link 
Why does the Sun shine? 
Lesson 2: The Structure of the Solar System 
Lesson Summary:
The solar system is made
up of the Sun, the planets
and their moons, comets,
asteroids, and meteoroids.
The Sun and nine planets
and their moons make up
the solar system.
(pp. 308-309)
Many of the planets have
moons. (pp. 310-311)
Asteroids, comets, and
meteors are smaller
objects in the solar system.
(p. 312)


Vocabulary 
  • solar system
  • telescope
  • moon
  • satellite
  • asteroid
  • comet
  • meteor
Resources
All About the Solar System 
Asteroid, Comet, or Meteor
Study Jams The Moon 
Textbook Link
National Geographic Kids Space
Play Space Janitor
Windows to the Universe
Lesson 3: Gravity and Orbit 
Lesson Summary:
The force of gravity
causes the planets to
follow their particular
paths around the Sun.
The pull of gravity
depends on the masses
of two objects and the
distance between them.
(pp. 318–319)
An object stays in orbit
because the attracting pull
of gravity is balanced by
its forward motion.
(pp. 320–321)
Tides are caused by the
gravitational pull of the
Sun and the Moon on
Earth. (p. 322)
Vocabulary 
  • gravity
  • orbit
  • inertia
  • ellipse
  • tide

Resources
Gravity and Inertia Study Jams
Text Link 
Super Planet Crash 
Gravity Launch 
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