spectra

Stars also have distinctive spectra, determined by their temperature, size, and, to a lesser degree, their chemistry.

The result is a mosaic of spectra, covering up to 60 different regions.

The spectra of the metals of the alkaline earths are equally definite, though more complicated.

It is science when the astronomer compares the spectrum of the sun with the spectra of various metals in the laboratory.

Gamma-ray spectra are collected all day, first from a sample, then from its accompanying standard.

The two gamma-ray spectra you obtain look like those in the figure on the opposite page.

Spectra of stars, per contra, appear relatively simple, since their feeble light is insufficient to bring out faint details.