Nova

/'nouvə/

Thân thiện

Definition

1. Noun:
   • A type of variable star: A nova is a star that experiences a sudden, dramatic increase in brightness, often becoming visible to the naked eye where none was seen before, before gradually fading over weeks or months.
   • The explosive event itself: The term also refers to the cataclysmic nuclear explosion that causes this brightening, resulting from the accretion of matter onto a white dwarf star in a binary system.

Usage Examples

• Noun:
  • Astronomers observed a nova in the constellation Cygnus last night.
  • The nova reached its peak brightness and is now slowly fading.
  • The study of a nova helps scientists understand stellar evolution.

Advanced Usage

• "Classical nova": The standard type of nova involving a white dwarf and a companion star.
  • A classical nova is not a supernova; it does not destroy the star.
• "Recurrent nova": A nova that has been observed to erupt multiple times.
  • T Coronae Borealis is a famous recurrent nova.

Variants and Related Words

• Novae (n): The traditional plural form, often used in scientific contexts.
  • The catalog lists several novae discovered this decade.
• Supernova (n): A much more powerful and destructive stellar explosion, often marking the death of a star.
  • A supernova is vastly more energetic than a nova.

Synonyms

• Cataclysmic variable star: A broader category of stars that includes novae and other eruptive types.
• Stellar explosion: A general term for which a nova is a specific, less destructive type.

Related Phrases

• Nova remnant: The expanding shell of gas ejected by the nova explosion.
  • The Hubble telescope captured an image of the nova remnant.

Học thuật

Noun

1. a star that ejects some of its material in the form of a cloud and become more luminous in the process