Australia is wider than the diameter of the Moon.
Why it is true
The distance from east to west in Australia is almost four thousand kilometers, while the lunar diameter is only three thousand four hundred kilometers.
Source: ESA
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.