giant stars
[/ˈdʒaɪənt stɑːrz/]
nounpl: giant stars
estrelas gigantes
1. In astronomy, a class of stars with large radii and high luminosity, typically in the later stages of stellar evolution. They have expanded from their main sequence size and are cooler than main sequence stars of similar mass.
Betelgeuse and Aldebaran are examples of giant stars visible from Earth.
Betelgeuse e Aldebaran são exemplos de estrelas gigantes visíveis da Terra.
2. Stars that have exhausted the hydrogen in their cores and have begun fusing hydrogen in a shell around the core, causing them to expand significantly.
As our Sun ages, it will eventually become a giant star in approximately 5 billion years.
À medida que o nosso Sol envelhece, eventualmente se tornará uma estrela gigante em aproximadamente 5 bilhões de anos.
This is a technical astronomical term used universally in scientific contexts across English-speaking and Portuguese-speaking countries. The term is standardized in astronomy education and research worldwide. In Brazil, this vocabulary is commonly taught in high school physics and astronomy courses. The classification of giant stars is fundamental to understanding stellar evolution and is used by astronomers in both the United States and Brazil without regional variation.
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