A galaxy can have millions of stars, and our Sun is just one star found within the entire Milky Way galaxy. The Sun is the main star in our own solar system, and our solar system is one of millions within the same Milky Way Galaxy.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.