UK K12 GCSE/A-Level: Year 5 KS2 Science - Earth and Space, Solar System Day and Night

Learning objectives

By the end of this topic, students will be able to:

• Explain the structure of the Solar System, including the Sun, planets, and other celestial bodies
• Describe the causes and effects of day and night, including the Earth's rotation and orbit around the Sun
• Identify and explain the differences between the day and night skies
• Use scientific vocabulary and concepts to describe the Solar System and the Earth's movements
• Apply knowledge of the Solar System and day and night to real-world contexts and scenarios

Core concepts

The Solar System is a collection of celestial bodies that orbit around the Sun, including eight planets, dwarf planets, asteroids, comets, and other smaller bodies. The planets are divided into two main categories: the inner planets (Mercury, Venus, Earth, and Mars) and the outer planets (Jupiter, Saturn, Uranus, and Neptune).

The Sun is the center of the Solar System and provides light and heat to the planets. The planets orbit around the Sun due to gravity, with the inner planets having shorter orbits and the outer planets having longer orbits.

The Earth rotates on its axis, causing day and night to occur. The Earth also orbits around the Sun, which takes approximately 365.25 days to complete one orbit. This is why we have a leap year every four years to account for the extra fraction of a day.

The day and night skies are different due to the Earth's rotation and the position of the Sun. During the day, the Sun is visible in the sky, and the stars are not visible due to the brightness of the Sun. At night, the stars are visible, and the Moon is often visible in the sky.

Worked examples

Example 1: Understanding the Solar System

Imagine you are on a spaceship traveling through the Solar System. You pass by the planet Mercury, which is closest to the Sun. You notice that Mercury is very hot and has no atmosphere. What can you conclude about Mercury's environment?

Answer: Mercury's close proximity to the Sun means it receives a lot of heat and light, making it a very hot planet. The lack of atmosphere means there is no air to protect the planet from the Sun's radiation, making it difficult for life to exist.

Example 2: Understanding day and night

Imagine you are on a hill watching the Sun set. You notice that the Sun appears to move slowly across the sky and eventually disappears below the horizon. What can you conclude about the Earth's movement?

Answer: The Earth's rotation causes the Sun to appear to move across the sky. As the Earth rotates, different parts of the planet face the Sun, causing day and night to occur.

Common misconceptions

• Many students believe that the Sun orbits around the Earth, rather than the Earth orbiting around the Sun.
• Some students think that day and night occur due to the Earth's size, rather than its rotation.
• A few students believe that the stars are visible during the day, rather than only at night.

Exam tips

• Make sure to use scientific vocabulary and concepts to describe the Solar System and the Earth's movements.
• Use diagrams and illustrations to help explain complex concepts.
• Practice answering questions that require synthesis, application, or evaluation, rather than recall alone.
• Make sure to read the question carefully and answer the question that is asked, rather than what you think the question is asking.

MCQs with explanations

Question 1: [F] What is the center of the Solar System?

A) Earth B) Sun C) Moon D) Jupiter

Answer: B) Sun

Why the distractors fail: A) Earth is a planet in the Solar System, but it is not the center. C) Moon is a natural satellite of the Earth, but it is not the center of the Solar System. D) Jupiter is a planet in the Solar System, but it is not the center.

Question 2: [H] What is the main cause of day and night?

A) The Earth's size B) The Earth's rotation C) The Sun's size D) The Moon's orbit

Answer: B) The Earth's rotation

Why the distractors fail: A) The Earth's size is not the main cause of day and night. C) The Sun's size is not the main cause of day and night. D) The Moon's orbit is not the main cause of day and night.

Question 3: [F] What is the name of the planet closest to the Sun?

A) Earth B) Mars C) Mercury D) Jupiter

Answer: C) Mercury

Why the distractors fail: A) Earth is not the closest planet to the Sun. B) Mars is not the closest planet to the Sun. D) Jupiter is not the closest planet to the Sun.

Question 4: [H] What is the name of the phenomenon that occurs when the Earth orbits around the Sun?

A) Day and night B) Tides C) Seasons D) Eclipses

Answer: C) Seasons

Why the distractors fail: A) Day and night occur due to the Earth's rotation, not its orbit around the Sun. B) Tides occur due to the gravitational pull of the Moon on the Earth's oceans. D) Eclipses occur when the Moon passes between the Earth and the Sun.

Question 5: [F] What is the name of the celestial body that orbits around the Earth?

A) Moon B) Sun C) Planet D) Star

Answer: A) Moon

Why the distractors fail: B) Sun is the center of the Solar System, not a celestial body that orbits around the Earth. C) Planet is a type of celestial body, but it is not the specific celestial body that orbits around the Earth. D) Star is a type of celestial body, but it is not the specific celestial body that orbits around the Earth.

Short-answer questions

Question 1

Describe the structure of the Solar System, including the Sun, planets, and other celestial bodies.

Answer: The Solar System is a collection of celestial bodies that orbit around the Sun, including eight planets, dwarf planets, asteroids, comets, and other smaller bodies. The planets are divided into two main categories: the inner planets (Mercury, Venus, Earth, and Mars) and the outer planets (Jupiter, Saturn, Uranus, and Neptune).

Question 2

Explain the causes and effects of day and night, including the Earth's rotation and orbit around the Sun.

Answer: The Earth's rotation causes day and night to occur. As the Earth rotates, different parts of the planet face the Sun, causing day and night to occur. The Earth also orbits around the Sun, which takes approximately 365.25 days to complete one orbit. This is why we have a leap year every four years to account for the extra fraction of a day.

Question 3

Describe the differences between the day and night skies, including the visibility of the Sun and stars.

Answer: During the day, the Sun is visible in the sky, and the stars are not visible due to the brightness of the Sun. At night, the stars are visible, and the Moon is often visible in the sky.