Astronomy

The Solar System is our cosmic neighbourhood — the Sun and the eight planets that orbit it, along with countless smaller bodies like asteroids and comets. This lesson works through the essential facts every student should be able to recall confidently: how many planets there are, the order in which they sit from the Sun, and the distinguishing feature that makes each one memorable.

You'll start with the basics — the Solar System has eight planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune), a count that was fixed in 2006 when the International Astronomical Union reclassified Pluto as a dwarf planet rather than a full planet. From there, the questions build outward: which planet is the largest (Jupiter, by a wide margin — its mass exceeds that of every other planet in the Solar System combined), why Mars looks red (iron oxide, or rust, coating its surface, not heat or atmosphere), and where Earth sits in the lineup (third from the Sun, and — as far as we know — the only planet in the Solar System that supports life).

The lesson also tests a skill that goes beyond simple recall: distinguishing the Sun and the eight true planets from the smaller bodies that share the Solar System with them, like asteroids and comets. This is a common point of confusion, since all of these objects orbit the Sun, but only eight of them meet the formal definition of a planet.

By working through these ten questions, you'll come away with a clear, ordered mental map of the Solar System — not just a list of names, but an understanding of scale, position, and the handful of standout facts (the largest planet, the red planet, the only inhabited one) that make each world distinct.

• Name all eight planets of the Solar System and recall their order outward from the Sun
• Explain why Mars appears red (iron oxide on its surface) and why it's called the 'Red Planet'
• Identify Jupiter as the largest planet in the Solar System
• State Earth's position (third from the Sun) and its unique status as the only known planet with life
• Distinguish the Sun and the eight planets from smaller Solar System bodies such as asteroids and comets

"The Solar System consists of the Sun and eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. Earth is the third planet from the Sun and the only known planet with life. Jupiter is the largest planet. Mars is called the Red Planet due to its iron oxide surface."