giant star

Thân thiện

A giant star shines brightly in the night sky.

Definition

Noun: A giant star is a star that has evolved from the main sequence and has become much larger and more luminous than it was in its main-sequence phase. It is characterized by a large diameter and a relatively low density compared to the Sun.

Examples

• Noun:
  • Betelgeuse, a red giant star, is so large that if placed at the center of our solar system, its surface would extend past the orbit of Jupiter.
  • Astronomers study the chemical composition of giant stars to understand stellar evolution.
  • The star evolved into a giant star after it exhausted the hydrogen fuel in its core.

Advanced Usage

• "Red giant star": A specific type of giant star in a late stage of stellar evolution, characterized by a cool surface temperature and a red hue.
  • In about five billion years, our Sun will become a red giant star.
• "Blue giant star": A massive, hot, and luminous giant star with a blue-white color.
  • Rigel is a famous blue giant star in the constellation Orion.

Variants and Related Words

• Giant (noun, in astronomy): Often used as a shortened, informal form of "giant star."
  • The star entered its giant phase.
• Supergiant (noun): A star that is even more massive and luminous than a giant star.
  • Supergiants represent a later or more extreme stage of stellar evolution than giants.
• Subgiant (noun): A star that is in the transitional phase between a main-sequence star and a giant star.
  • The subgiant branch is a distinct phase in a star's life cycle.

Synonyms

• Luminous giant: Emphasizes the star's high brightness.
• Evolved star: Highlights the star's advanced stage in its life cycle.

Related Phrases

• "Giant branch": Refers to the region on the Hertzsprung–Russell diagram where giant stars are located.
  • After leaving the main sequence, stars ascend the giant branch.
• "Asymptotic Giant Branch (AGB)": A specific, late phase of evolution for low- to intermediate-mass stars.
  • Stars on the asymptotic giant branch undergo thermal pulses.

Học thuật

Noun

1. a very bright star of large diameter and low density (relative to the Sun)

Từ đồng nghĩa

• giant