We use a cross, or an X, to show multiplying or 'timesing' something.

我们使用十字或 X 来表示乘法或“计时”某物。

So that's a one with 27 zeros behind it, which just means that we've taken one meter and timesed it by 10 27 times.

这是一个后面有 27 个零的 1，这意味着我们将一米乘以 10 27 次。