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Transcript
1
1. The Parts of the Solar System
2
We live on the planet Earth
Vocabulary
Planet
A large, solid object that travels
around a star
3
Earth is one of nine planets circling
a star we call the sun
The sun and the nine planets
make up our solar system
4
Vocabulary
Solar system
The sun and the nine planets
5
The most common theory of how
the solar system was formed was by
circulating gases and dust
6
A chemical reaction occurred with
heat
to cause an explosion causing objects
to form during cooling
7
Video Birth of a Solar System
8
Each of the nine planets move in an
orbit around the sun
Vocabulary
Orbit
A curved path that each of the
planets moves around the sun
9
The size of a planet’s orbit
depends on the distance of the planet
from the sun
10
Planets far from the sun have large
orbits
Closer planets have smaller orbits.
Mercury
Venus
Earth
Mars
11
All the planets are held in orbit by a
force called gravity
Vocabulary
Gravity
A force that acts like a pull
between the sun and planets
12
Without gravity, the planets would
drift into space
The space shuttles sent to space by
NASA are held into orbit around the
Earth by gravity
13
Some planets have smaller objects
called moons
Vocabulary
Moons
A small object in orbit with a
planet
14
Each moon is held in orbit by the
gravity between the moon and its
planet
There are more than 50 moons
orbiting the planets of the solar
system
15
One moon orbits
Earth
16
Asteroids and comets are smaller
objects in the solar system
17
Asteroids orbit the sun in a belt
between the planets Mars & Jupiter
Vocabulary
Asteroids
An object made of rock and
metal that orbits the sun
18
A comet has a bright fiery head and a
long tail of light
Vocabulary
Comet
An object made of ice, gas, and
dust that orbits the sun
19
Comets have very large orbits and
travel to the edge of the solar system
20