The extreme difficulty of using these very long focal length telescopes led astronomers to develop alternative designs.

The unusual characteristics of the afterglow led astronomers to generate novel hypotheses to explain the event.

These have led astronomers to reappraise the age and size of the universe.

It can also refer to breaks in cloud cover, which lead astronomers into trying to make observations, only to have the cloud close in again.

This led astronomers to recognize that Newtonian mechanics did not provide the highest accuracy.

The gradual rather than sudden dimming led astronomers to conclude that the planet had an atmosphere whose thickness was comparable to the radius of the planet itself.

This led astronomers to conclude that it was a white dwarf, the second to be discovered.

Gamma-ray bursts have led astronomers on a merry chase since the 1960's, when they were accidentally discovered by satellites intended to look for nuclear tests on Earth.

But the subsequent discovery of more and more things like it in the same part of space led astronomers to dub them asteroids.

This discovery eventually led astronomers to look at radio waves along with optical waves to find things in the sky.