The solar system

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レッスンノート

The Solar System Overview

The solar system consists of a star (the Sun) and eight planets.
The Sun contains most of the mass of the solar system.
Gravitational forces keep the planets in orbit around the Sun.
The Sun's surface temperature is around 6000°C.

Planets in Order from the Sun

1. Mercury – smallest planet, closest to the Sun.
2. Venus – has a carbon dioxide atmosphere, hottest planet.
3. Earth – only known planet with life.
4. Mars – colder than Earth, further from the Sun.
5. Jupiter – largest planet, Great Red Spot (storm lasting >400 years).
6. Saturn – second largest, rings made of ice and rock.
7. Uranus – third largest, rotates on its side.
8. Neptune – furthest planet, lowest average temperature.

Types of Planets

Terrestrial (rocky) planets: Mercury, Venus, Earth, Mars (closest four).
Gas giants: Jupiter and Saturn.
Ice giants: Uranus and Neptune.
Pluto is a dwarf planet, beyond Neptune.

Temperature and Gravity

Planet temperature generally decreases with distance from the Sun.
Venus is an exception – its CO₂ atmosphere traps heat (greenhouse effect).
Neptune has the lowest average temperature (furthest from Sun).
Jupiter has the largest gravitational field strength (25 N/kg).

Mnemonic for Planet Order

My Very Easy Method Just Speeds Up Naming (Planets).
Corresponds to: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Diagram of the solar system showing the Sun and eight planets in order, with orbits.

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練習問題

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1.How many planets are there in the solar system?
Easy
- A8
- B7
- C9
- D10
2.Which of the following are the four terrestrial planets?
Easy
- AMercury, Venus, Earth, Mars
- BMercury, Venus, Earth, Jupiter
- CVenus, Earth, Mars, Jupiter
- DEarth, Mars, Jupiter, Saturn
3.Which planets are the gas giants?
Easy
- AJupiter and Saturn
- BUranus and Neptune
- CSaturn and Uranus
- DJupiter and Neptune
4.Which planets are the ice giants?
Easy
- AUranus and Neptune
- BJupiter and Saturn
- CSaturn and Uranus
- DNeptune and Pluto
5.What is the correct order of planets from the Sun outward?
Easy
- AMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
- BMercury, Venus, Earth, Mars, Saturn, Jupiter, Uranus, Neptune
- CVenus, Mercury, Earth, Mars, Jupiter, Saturn, Neptune, Uranus
- DMercury, Earth, Venus, Mars, Jupiter, Saturn, Uranus, Neptune
6.Which planet has the highest average surface temperature and why?
Medium
- AVenus, because of its carbon dioxide atmosphere
- BMercury, because it is closest to the Sun
- CVenus, because it is closest to the Sun
- DJupiter, because it is a gas giant
7.What object contains most of the mass in the solar system?
Easy
- AThe Sun
- BJupiter
- CEarth
- DSaturn
8.What force keeps planets in orbit around the Sun?
Easy
- AGravitational force
- BMagnetic force
- CCentrifugal force
- DNuclear force

もっと問題

9.Which planet has the lowest average surface temperature and why?
Medium
- ANeptune, because it is farthest from the Sun
- BPluto, because it is a dwarf planet
- CUranus, because it rotates on its side
- DNeptune, because it has no atmosphere
10.Name a dwarf planet in the solar system.
Easy
- APluto
- BMercury
- CNeptune
- DCeres
11.What is the surface temperature of the Sun?
Easy
- A6000°C
- B600°C
- C60,000°C
- D6000 K
12.Which planet is the second largest and has rings made of ice and rock?
Easy
- ASaturn
- BJupiter
- CUranus
- DNeptune
13.Jupiter has the largest gravitational field strength among the planets. What is its value?
Easy
- A25 N/kg
- B10 N/kg
- C9.8 N/kg
- D100 N/kg
14.Which planet rotates on its side?
Easy
- AUranus
- BNeptune
- CSaturn
- DVenus
15.The Great Red Spot on Jupiter is a storm that has lasted for over 400 years. What does this tell you about Jupiter's atmosphere?
Medium
- AIt is very stable and long-lasting.
- BIt changes rapidly every year.
- CIt has no storms.
- DIt is made of ice.
16.Venus has a carbon dioxide atmosphere. Carbon dioxide is a greenhouse gas. Which of the following best explains why Venus is the hottest planet?
Medium
- AIt is closest to the Sun.
- BIts greenhouse atmosphere traps heat.
- CIt has no atmosphere.
- DIt rotates very quickly.
17.Which planet is the third largest in the solar system?
Easy
- AUranus
- BNeptune
- CSaturn
- DJupiter
18.The surface temperature of the Sun is about 6000°C. What is this temperature in kelvin? (0°C = 273 K)
Medium
- A6273 K
- B5727 K
- C6000 K
- D273 K
19.A student claims that the temperature of planets decreases with distance from the Sun. Which planet is an exception to this rule?
Medium
- AVenus
- BMercury
- CMars
- DNeptune
20.Which of the following lists the planets in order of increasing distance from the Sun?
Easy
- AMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
- BMercury, Earth, Venus, Mars, Jupiter, Saturn, Neptune, Uranus
- CMercury, Venus, Earth, Mars, Saturn, Jupiter, Uranus, Neptune
- DVenus, Mercury, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
21.Pluto is classified as a dwarf planet. Where is it located relative to the other planets?
Easy
- AIt is further from the Sun than Neptune.
- BIt is between Mars and Jupiter.
- CIt is between Uranus and Neptune.
- DIt is closer to the Sun than Mercury.
22.The gravitational force between the Sun and a planet depends on the mass of the Sun and the planet, and the distance between them. If the distance from the Sun to a planet doubles, what happens to the gravitational force? (Assume masses remain constant.)
Hard
- AIt becomes one quarter.
- BIt becomes half.
- CIt doubles.
- DIt quadruples.
23.Which planet is the smallest in the solar system?
Easy
- AMercury
- BMars
- CVenus
- DPluto
24.Which of the following is NOT a terrestrial planet?
Easy
- AJupiter
- BMercury
- CVenus
- DMars
25.A student uses a model to represent the solar system with a lamp as the Sun and small balls as planets. Which of the following is a limitation of this model?
Medium
- AThe lamp gives off heat, but the Sun also emits light.
- BThe balls are solid, but planets are made of gas.
- CThe distances between the balls are not to scale.
- DThe lamp is much smaller than the real Sun.
26.A student investigates how the temperature of a planet depends on its distance from the Sun. They use a heat lamp and place a thermometer at different distances. Which variable should they keep constant?
Easy
- AThe distance from the lamp
- BThe type of thermometer
- CThe time the lamp is on
- DThe colour of the thermometer
27.The table shows the mean distance from the Sun and the orbital period for the four inner planets. Which planet has the longest orbital period?
Easy
- AMercury
- BVenus
- CEarth
- DMars
28.A student measures the diameter of a model of Saturn's rings using a ruler. The actual diameter of Saturn's rings is about 280,000 km. The model's diameter is 28 cm. What is the scale of the model?
Medium
- A1 cm : 10,000 km
- B1 cm : 100,000 km
- C1 cm : 1,000 km
- D1 cm : 28,000 km
29.The gravitational field strength on Jupiter is 25 N/kg. On Earth it is 10 N/kg. A spacecraft has a mass of 500 kg. What is the difference in weight of the spacecraft on Jupiter compared to on Earth?
Medium
- A5000 N
- B7500 N
- C12500 N
- D17500 N
30.A student makes a poster showing the planets in order. Which mnemonic could help them remember the order starting from Mercury?
Easy
- AMy Very Educated Mother Just Served Us Noodles
- BMy Very Easy Method Just Speeds Up Naming
- CMany Very Educated Men Just Served Us Noodles
- DMy Very Easy Method Just Speeds Up Numbers
31.A student reads that the Great Red Spot on Jupiter has lasted for over 400 years. Which of the following can be inferred from this fact?
Medium
- AJupiter's atmosphere is very thin.
- BJupiter's atmosphere is very stable and thick.
- CThe storm is moving very slowly.
- DJupiter's surface is solid.
32.Which of the following is a dwarf planet?
Easy
- AMercury
- BPluto
- CNeptune
- DUranus
33.The Sun's surface temperature is about 6000°C. What is this temperature in kelvin? (0°C = 273 K)
Medium
- A273 K
- B6000 K
- C6273 K
- D5727 K
34.Which planet is an exception to the rule that temperature decreases with distance from the Sun?
Medium
- AMercury
- BVenus
- CEarth
- DMars
35.A student claims that the gravitational force between the Sun and a planet depends on the mass of the Sun and the planet, and the distance between them. Which planet experiences the greatest gravitational force from the Sun?
Medium
- AMercury
- BJupiter
- CNeptune
- DVenus
36.Which planet is the second largest in the solar system and has rings made of ice and rock?
Easy
- ASaturn
- BJupiter
- CUranus
- DNeptune
37.Which planet has the largest gravitational field strength?
Easy
- AJupiter
- BSaturn
- CEarth
- DNeptune
38.Which planet is a dwarf planet?
Easy
- APluto
- BMercury
- CMars
- DNeptune
39.Which of the following is a gas giant?
Easy
- AJupiter
- BUranus
- CNeptune
- DEarth
40.A student models the solar system using a lamp as the Sun and small balls as planets. The lamp is placed at the center and the balls are placed at different distances. Which of the following is a limitation of this model?
Medium
- AThe model does not show the relative sizes of the planets.
- BThe model does not show the relative distances of the planets.
- CThe model does not show the gravitational force keeping planets in orbit.
- DThe model does not show the number of planets.
41.The Sun contains most of the mass of the solar system.
Easy
True or false?
42.Which planet is known for its Great Red Spot?
Easy
- ASaturn
- BMars
- CJupiter
- DNeptune
43.Venus is the hottest planet because it is closest to the Sun.
Medium
True or false?
44.Saturn is the only planet with rings.
Easy
True or false?
45.Uranus and Neptune are classified as ice giants.
Easy
True or false?
46.What keeps the planets in orbit around the Sun?
Easy
- AMagnetic forces
- BGravitational forces
- CCentrifugal forces
- DElectrostatic forces
47.Match each planet to its correct classification.
Medium
- Mercury
- Jupiter
- Uranus
- Neptune
- Terrestrial planet
- Gas giant
- Ice giant
- Ice giant
48.Arrange the following planets in order from closest to furthest from the Sun.
Easy
- Mars
- Earth
- Venus
- Mercury
49.Select all the planets that are classified as gas giants.
Medium
- AJupiter
- BSaturn
- CUranus
- DNeptune
- EMars
50.Which of the following are true about Venus? (Select all that apply.)
Medium
- AIt is the hottest planet.
- BIt has a carbon dioxide atmosphere.
- CIt is a terrestrial planet.
- DIt is the closest planet to the Sun.
51.Fill in the blank.
Easy
The four planets closest to the Sun are called the ____ planets.
52.Complete the mnemonic.
Easy
My Very Easy Method Just ____ Up Naming Planets.
53.What is the gravitational field strength on Jupiter in N/kg?
Medium
54.What is the gravitational field strength on Jupiter in N/kg?
Medium
- A31 N/kg
- B25 N/kg
- C22 N/kg
- D28 N/kg

復習ノート

## The Solar System - The solar system consists of a star (the Sun) and eight planets. The Sun contains most of the mass, so its gravity keeps planets in orbit. - Surface temperature of the Sun: ~6000°C. ### Planets in order from the Sun: 1. **Mercury** – smallest, closest to Sun. 2. **Venus** – carbon dioxide atmosphere (greenhouse gas), hottest planet. 3. **Earth** – only known planet with life. 4. **Mars** – colder than Earth. 5. **Jupiter** – largest planet, largest gravitational field strength (25 N/kg), Great Red Spot (storm lasting >400 years). 6. **Saturn** – second largest, rings made of ice and rock. 7. **Uranus** – third largest, rotates on its side. 8. **Neptune** – furthest from Sun, lowest average temperature. - **Pluto** is a dwarf planet, beyond Neptune. - Mnemonic: **M**y **V**ery **E**asy **M**ethod **J**ust **S**peeds **U**p **N**aming (Planets). ### Types of planets: - **Terrestrial (rocky) planets**: Mercury, Venus, Earth, Mars (closest four). - **Gas giants**: Jupiter, Saturn. - **Ice giants**: Uranus, Neptune. - Generally, temperature decreases with distance from Sun, except Venus (due to greenhouse effect). **Key fact**: Gravitational force keeps planets in orbit around the Sun.

Solar system: A star (the Sun) and the eight planets that orbit it, plus other objects.
Terrestrial planets: The four rocky planets closest to the Sun: Mercury, Venus, Earth, Mars.
Gas giants: The large planets made mostly of gas: Jupiter and Saturn.
Ice giants: The planets made mostly of ice: Uranus and Neptune.
Dwarf planet: A celestial body that orbits the Sun but is not a full planet, e.g., Pluto.
Gravitational force: The force that keeps planets in orbit around the Sun.
Great Red Spot: A storm on Jupiter that has lasted for over 400 years.

フラッシュカード

How many planets are in the solar system?

There are eight planets.

What is the Sun's surface temperature?

Around 6000°C.

Which object contains most of the mass in the solar system?

The Sun.

What force keeps planets in orbit around the Sun?

Gravitational force.

List the planets in order from closest to furthest from the Sun.

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

What is the smallest planet and closest to the Sun?

Mercury.

Which planet has a carbon dioxide atmosphere and is the hottest?

Venus.

Why is Venus the hottest planet?

Its carbon dioxide atmosphere is a greenhouse gas, trapping heat.

Which planet is known to have life?

Earth.

Which planet is much colder than Earth because it is further from the Sun?

Mars.

What is the largest planet in the solar system?

Jupiter.

What is Jupiter's Great Red Spot?

A storm that has lasted for over 400 years.

What is Jupiter's gravitational field strength?

25 N/kg.

Which planet is second largest and has rings made of ice and rock?

Saturn.

Which planet rotates on its side?

Uranus.

Which planet is furthest from the Sun and has the lowest average temperature?

Neptune.

What is Pluto classified as?

A dwarf planet.

Name a mnemonic to remember the order of the planets.

My Very Easy Method Just Speeds Up Naming (Planets).

Which four planets are terrestrial (rocky)?

Mercury, Venus, Earth, Mars.

Which two planets are gas giants?

Jupiter and Saturn.

Which two planets are ice giants?

Uranus and Neptune.

How does planet temperature generally change with distance from the Sun?

Temperature generally decreases with distance from the Sun.

Which planet is an exception to the temperature-distance trend and why?

Venus, because its carbon dioxide atmosphere traps heat.

Which planet has the largest gravitational field strength?

Jupiter.

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