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Our Solar System
Big Idea 5: Earth in Space and TimeSC.5.E.5.1, SC.5.E.5.2, SC.5.E.5.3
Planets in Our Solar System
The inner planets are Mercury, Venus, Earth, and Mars are small and mostly solid. The outer planets are Jupiter, Saturn, Uranus, and Neptune are large and made mostly of gases.
Between the inner and outer planets is a belt of rocks called asteroids that orbit the sun.
Comets are icy gaseous objects that leave dust trails when their orbits come near the sun.
EXPLORE
Your Place In Space
Solar System
Resource Link: http://www.windows.ucar.edu/tour/link=/our_solar_system/solar_system.html
Planet Characteristics
Inner PlanetsSize: Small
Rocky and Solid
Few or no moons
Temperature: Hot to warm
. Mercury Venus Earth (one moon) Mars
Outer PlanetsSize: Large
Composed of gas and dust
Many moons
Temperature: Cool to cold
Jupiter Saturn Uranus Neptune
Sun The sun is the closest star
to Earth. The sun is a big ball of hot
gases. The sun gives off two kinds of
energy: light and heat. This is called solar energy.
All eight planets orbit, or revolve, around the sun.
The sun is so large that more than a million Earths could fit inside it.
Sun and Stars Stars come in all different sizes. Our Sun is the standard used for comparing all
other star sizes. The biggest stars are called supergiants.
Some are 500 times larger than the Sun.
Some of the smallest stars are white dwarfs. Many are 1/100 the size of the Sun -
roughly the size of Earth
Planet
A planet is a large ball of rock or gas that follows a path round the sun.
There are eight planets.
Sun Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
(My Very Educated Mother Just Showed Us Neptune!)
The solar system includes the sun and eight planets.
Earth Earth is the planet that we live on. It is the 3rd
planet from the sun. It is called a “Rocky Planet,” because it is made of rocks.
Sometimes Earth is called the “Water Planet,” because it is the only planet with the water we need to live.
Earth orbits, or circles, the sun in 365 days, or one year.
While it is orbiting the sun, it also spins like a top! It spins 1 time in 24 hours, and that is why Earth’s day lasts for 24 hours.
Earth is the only known planet where plants and animals live.
Planet Characteristics
Planet Size Length of Its Orbit Composition of Planet ( Use a reference to fill in this data)
Mercury Small
Shortest or a measurement
Rocky
No moonsVenus small Longer than Mercury
but shorter than Earth’s or a measurement
Rocky
No moons
Earth small Longer than Venus but shorter than Mar’s or a measurement
Rocky
One moon
Mars small Longer than Earth but shorter than Jupiter’s or a measurement
Rocky
No moons
Jupiter Largest Planet Longer than Mars but shorter than Neptune’s or a measurement
Gases and dust
Many moons
Saturn Large Longer than Jupiter but shorter than Uranus’s or a measurement
Gases and dust
Many moons
Uranus Large Longer than Saturn but shorter than Neptune’s or a measurement
Gases and dust
Many moons
Neptune Large Longer than Uranus but shorter than Pluto’s or a measurement
Gases and dust
Many moons
Comparing Planets in Our Solar System Planet Number of Moons Length of Year
in Earth Days
Mercury 0 88
Venus 0 224.7
Earth 1 365
Mars 2 687
Jupiter 63 4,329
Saturn 62 10,752
Uranus 27 30,660
Neptune 13 60,152
Extension/Enrichment
GIZMOS – Solar Systemwww.explorelearning.com
Interactive Notebook Reflection• Draw a model of the solar system and label planets.• Describe planet characteristics.
