Starting in the 17th century progressively more advanced telescopic observations from earth have been made.

The crew will not suspect anything, having received no radio alarm, and being too high for telescopic observation of what has happened.

The feature had been observed several times since telescopic observations began.

You've made quite a few telescopic observations since being put together, Cutie.

Five instruments are the key to the scientific interpretation of the telescopic observations.

He dedicated himself to the telescopic observation of the planets.

It is notable for employing the use of telescopic observations.

They can know only later, when telescopic observations from earth reveal that the fleet is indeed on its way.

By then we should be able to get some telescopic observations with enough definition to tell us whether there's a civilization there or not.

Something to do with telescopic observation of the Ruml area of space?