Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The Solar System consists of the Sun at the center and planets that revolve around it in fixed paths called orbits.
The Sun is a massive ball of burning gases, primarily and , with a surface temperature of approximately .
Planets do not have their own light; they reflect the light of the Sun. They are classified into Inner Planets (Mercury, Venus, Earth, Mars) and Outer Planets (Jupiter, Saturn, Uranus, Neptune).
Rotation is the spinning movement of a planet on its own axis. Earth's rotation takes hours and causes Day and Night.
Revolution is the movement of a planet around the Sun. Earth takes days to complete one revolution, which causes seasons.
Mercury is the closest planet to the Sun, while Neptune is the farthest. Venus is the hottest planet due to a thick atmosphere of (Carbon Dioxide) that traps heat.
Earth is known as the 'Blue Planet' because about of its surface is covered with (water).
Jupiter is the largest planet, so big that about Earths could fit inside it.
📐Formulae
💡Examples
Problem 1:
If a planet takes Earth days to complete one revolution, is it closer to or further from the Sun compared to Earth?
Solution:
It is closer to the Sun.
Explanation:
According to planetary motion, planets closer to the Sun have smaller orbits and move faster. Since , the planet (Mercury) is closer to the Sun than Earth.
Problem 2:
Why does the Sun appear much larger and brighter than other stars seen at night?
Solution:
Because of its relative distance to Earth.
Explanation:
The Sun is the nearest star to Earth, at a distance of approximately . Other stars are many light-years away, making them appear as tiny dots.
Problem 3:
Calculate the number of hours in a Leap Year.
Solution:
Explanation:
A Leap Year has days. Since , total hours = .