In identifying the nature of the objects, astronomers realized they were very nearby objects, perhaps even belonging to the Local Group.

However, within months, another American astronomer, Simon Newcomb, realized that Chandler was correct and provided a plausible reason for Chandler's measurements.

But in recent years, astronomers have realized that collisions are not uncommon within dense clusters of stars.

After Sedna, the astronomers also realized that there could be more discoveries lurking in their photographs.

But the look on his face indicated that the old astronomer realized the probable accuracy of Theremon's guess.

He witnessed the story of the Reformation, then how an amateur astronomer named Copernicus realised that the earth travelled round the sun.

The most knowledgeable astronomers of the time had realized that the foreword was Osiander's doing.

But in recent years, astronomers have realized that even fixed telescopes that can point only upward are useful.

To this day, these clouds go by the confusing misnomer of planetary nebulae, even though astronomers realized that they could not be seeing planets that far away.

The earliest known photograph of Pluto was taken, although the astronomers at the Yerkes Observatory did not realize it.