They believe that our major observatories will not take pictures of the landing sites because it would expose the cover-up.

Most major optical astronomical observatories are surrounded by zones of strictly-enforced restrictions on light emissions.

He even built his own major observatory in California.

Astronomers at the major North American observatories denied that they had seen it.

The innovations are especially conspicuous at three major observatories in northern Chile, all of which have made large contributions to the current supernova investigation.

These chips are rapidly finding their way into major observatories, including the three in northern Chile.

The result is that the Mount Hamilton site remains a viable location for a major working observatory.

This facility is the closest major optical observatory to the equator lying at 8 degrees and 47.51 minutes north.

It is considered one of the world's major observatories.

The process by which data are calibrated automatically is known as 'pipeline reduction', and is increasingly common at major observatories.