How far away is the Sun compared with the Moon?

Picture the Moon shining outside your window. The Sun shines in the sky during the day. They both look far away. How far away is the Sun compared with the Moon?

Let's make a model, a small pretend version of real things. Our model will use a path of steps. That way, you can picture space without counting enormous numbers. The path shows the gaps, not the sizes of things.

Put a little Earth at the start of our pretend path. Earth is where you live, so our measuring starts there. Every step along this path will have the same length. No giant steps and then tiny ones on this path!

Now put a little Moon one step from Earth. That step stands for the whole gap between Earth and the Moon. Our model makes that huge space small enough to step across.

To place the Sun, we need a much longer path. Make a line ten steps long. Each step matches our Earth-to-Moon step. We'll use this line to build the longer path.

Join ten of those lines, end to end. They make one long row, with no gaps between the lines. This gives us a bigger piece for measuring. How many long rows will reach our model Sun?

Four long rows, joined end to end! Put our little Sun at the very end of the last row, far beyond the first, second, and third rows. Earth to the Moon was just one step. Earth to the Sun stretches all the way along those four rows.

Model. Starting from Earth, the Moon is one model step away, and the Sun is four long rows away.

Now you can carry that great, wide space in your imagination, little sky explorer.