Choice of Words: Moons, smaller, and planets are all related to size and comparison. Moons are generally smaller in size compared to the planets they orbit around.
Alternative Expressions
Moons are not as big as planets.
Meaning: This sentence is saying the same thing as the first sentence, but it uses different words. It's like saying, A car is not as fast as a train.
Choice of Words:Moons are objects that orbit planets. Not as big means smaller. Planets are large objects that orbit the sun. When you put them together, "Moons are not as big as planets" means that moons are smaller than planets.
The size of moons is smaller than the size of planets.
Meaning: This sentence is saying the same thing as the first two sentences, but it uses more specific words. It's like saying, The size of a mouse is smaller than the size of a cat.
Choice of Words:Size means how big something is. Smaller means not as big. Planets are large objects that orbit the sun. When you put them together, "The size of moons is smaller than the size of planets" means that moons are not as big as planets.