Sentence examples for had only been observed from inspiring English sources

As the phenomenon had only been observed once before, by Jeremiah Horrocks in 1639, let's just pause to give Halley some credit for this achievement in the first place.

It had only been observed in binary star systems where two stars dance around each other at close distances.

Before, this effect had only been observed in crystalline materials that possessed a certain symmetry.

Since 1993, physicists had predicted GRBs to be followed by a lower-energy afterglow (in wavelengths such as radio waves, x-rays, and even visible light), but until this event, GRBs had only been observed in highly luminous bursts of high-energy gamma rays (the most energetic form of electromagnetic radiation).

Mental retardation had only been observed with the KCNC3Phe448Leu mutation [11].

Sec6p and Exo70p interactions with full-length Sec10p were previously shown by qualitative pull-down binding assays using partially purified proteins [12], [15], while binding of Exo84p had only been observed in yeast two-hybrid assays [28].

They have orbital periods of more than 300 years and most have only been observed over a short observation arc of a couple years.

This character is an autapomorphy for sloths, and among other mammals has only been observed in the platypus, Ornithorynchus aculeatus (personal observation).

That capability has only been observed in higher primates and a few other animal species.

However, over-compensation has only been observed when cycles of deprivation and satiation feedings have occurred.

Until now, the consequences of these shifts have only been observed when the facilities are operating.