There are many things out there in space. We can see only some of them. There are the Sun, the Moon, and many stars. They are very large. They seem small to us because they are very far away. There are many things in space that we cannot see. We cannot see them because they are very far away. Our eyes can only see things when we get or receive light from them. A telescope is like a big eye. So, it takes in a lot more light. And it makes things that are faraway look bigger. Astronauts train long and hard to go into space. They work underwater to feel what it will be like in space.
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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.