Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The Solar System is composed of a central star, the Sun, and major planets orbiting it: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
Rotation refers to Earth spinning on its imaginary axis. One full rotation takes approximately hours, which creates the cycle of day and night.
Revolution is the movement of Earth around the Sun in an elliptical path called an orbit. One complete revolution takes approximately days, defining year.
Earth is tilted on its axis at an angle of approximately . This tilt, combined with the revolution around the Sun, is responsible for the changing seasons (, , , ).
The Moon is Earth's only natural satellite. It revolves around the Earth approximately every days, leading to the different lunar phases we see from Earth.
Gravity is the force of attraction that keeps planets in their orbits around the Sun and the Moon in orbit around the Earth.
📐Formulae
💡Examples
Problem 1:
If the Earth takes days to orbit the Sun once, how many days will have passed after complete orbits?
Solution:
days.
Explanation:
To find the total days, multiply the time for one revolution () by the number of orbits (). This extra day every year is why we add a 'Leap Day' to the calendar every years.
Problem 2:
Identify which movement causes day and night and how long it takes in minutes.
Solution:
minutes.
Explanation:
Day and night are caused by Earth's rotation on its axis. Since one rotation takes hours and there are minutes in an hour, the total time is minutes.
Problem 3:
Why does the Moon appear to change shape over the course of a month?
Solution:
The Moon's phases change based on its position relative to the Earth and the Sun.
Explanation:
As the Moon orbits the Earth, different portions of its sunlit side become visible to us. We call these stages phases, such as the , , , and .