So it's going to be getting much better observations of Europa than we've ever had before.

因此，它对木卫二的观察质量会远远优于我们以往获得的。

But over the years better observations showed it to be far smaller than first thought; in fact it's smaller than Earth's Moon!

但多年来的观察表明，它比我们最初想象的要小得多；事实上，它比月球还小！