An observatory is a building that holds one or many very big telescopes.

They were grouped around the big telescope on its tripod.

All that would be much too small and faint to see even with a very big telescope.

She wanted to get a view through the big telescope.

"So you don't actually see the wandering satellite at all, even with the big telescope?"

And then you still can't see it, without a big telescope, because it's so far away.

The big telescopes were no use now; the thing was too close and moving too fast for them.

He won't mind waiting six months for a bigger and better telescope.

"This is the place where all the big telescopes are, and my wife wants to be here."

"By the way," I asked, "how small a thing will the biggest telescopes show upon the moon?"