Vocabulary
The solar system
Concepts
Planets 1
Planets 2
100

Mercury, Venus, Earth, and Mars are called

Terrestrial Planets

100

List two objects other than planets and the moon located with our solar system

asteroids and comets
100
Gas giants are another name for these planets

outer planets

100

Terrestrial planets are another  name for these planets

inner planets

100

Scientists use this unit because the universe is too expansive to use Earth scaled units.

astronomical unit

200

Jupiter, Saturn, Uranus, and Neptune are called

Gas Giants

200

This group of planets is made mostly of hydrogen and helium

Gas giants or outer planets

200

This group of planets are made mostly of silicon and iron

inner planets or terrestrial planets

200
A planet makes this shape with its orbit

ellipse

200

How does an ellipse affect a planet's speed?

Because an ellipse has a closest and furthest extent when a planet is furthest away in orbit it is slowest and when it approaches the closest point in orbit it is the fastest.

300

The unit equal to the average distance from Earth to the Sun

astronomical unit

300

Explain a period of revolution.

the time it takes an object or planet to go completely around the Sun

300

Explain period of rotation.

The time it takes an object or planet to spin completely around its axis once.

300

This planet is 97% Carbon dioxide in its atmosphere, has the greenhouse effect and is 80% covered in lava

Venus

300

This planet has sideways tilt. hydrogen and helium atmosphere, thick slushy layers of water and ammonium

Uranus

400

The time it takes an object to travel once around the sun

period of revolution

400

List the planets in order from closest to furthest from the sun

Mercury, venus, earth, mars, jupiter, saturn, uranus, and nepturn

400

Explain how moons form.

Objects collide into one another binding together over time. The gravitational force of planets hold them in orbit forming moons

400

Atmosphere 90% hydrogen and 10% helium, has a gas layer followed by thick liquid layer and has rings of ice

Saturn

400

Atmosphere similar to Uranus, core of frozen water and ammonia

Neptune

500

The time it takes for an object to spin once around its axis

period of rotation

500

Explain the greenhouse effect.

Gas particles are trapped within the atmosphere and absorb heat increasing a planet's temperature.

500

Why is Venus hotter than Mercury?

Mercury has no atmosphere and is not able to trap gas particles in its atmosphere to cause the greenhouse effect which exists within Venus atmosphere.
500

Temperatures form 450 degrees C to -170 degrees C, no atmosphere, surface full of craters and cracking/wrinkles

Mercury

500

95% carbon dioxide atmosphere, temperatures from 20 degrees C to -125 degrees C, month long wind storms, polar ice caps of ice and frozen CO2

Mars

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