linha escura
1. a line that appears dark in color, often used in scientific or technical contexts such as spectroscopy, astronomy, or visual representation
The dark line in the spectrum indicates the presence of hydrogen.
A linha escura no espectro indica a presença de hidrogênio.
2. a visible mark or streak that is noticeably dark compared to its surroundings
A dark line appeared on the horizon as the storm approached.
Uma linha escura apareceu no horizonte quando a tempestade se aproximava.
3. in astronomy, an absorption line in a star's spectrum caused by cooler gas
The Fraunhofer dark lines in the sun's spectrum help astronomers identify elements.
As linhas escuras de Fraunhofer no espectro do sol ajudam os astrônomos a identificar elementos.
The term 'dark line' is primarily used in scientific and technical contexts in both English-speaking and Portuguese-speaking countries. It is especially common in astronomy and physics education when discussing the Fraunhofer lines discovered by Joseph von Fraunhofer in the solar spectrum.
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