But just let's assume that some race able to traverse space visited Earth.

Against the wishes of his teacher, he repeatedly visits Earth.

I visited Earth three times, and each time they had made more progress.

You might want to visit Earth yourself, see what conditions are like firsthand.

I understand she has always wanted to visit Earth.

During this time they evidently had visited Earth, twice at the very least.

Been some three hundred years since his lordship last visited Earth.

If we don't find anything-well-we'll never have another chance to visit Earth.

He visited Earth six times and observed it from just after its creation until 1922.

One day, he told himself, he really must visit Earth again.