Definition

Noun: 1. A supernova remnant: The Crab Nebula is the expanding cloud of gas and dust resulting from a supernova explosion that was observed on Earth in the year 1054 AD. It is located in the constellation Taurus. 2. A pulsar wind nebula: It is energized by a pulsar (a rapidly rotating neutron star) at its center, which emits radiation across the electromagnetic spectrum, making it a strong source of radio waves, X-rays, and gamma rays.

Usage Examples

• Astronomers study the Crab Nebula to understand the life cycle of stars.
• The Crab Nebula is one of the most famous and well-observed objects in the night sky.
• Light from the supernova that created the Crab Nebula reached Earth in 1054 AD.

Advanced Usage

• "The Crab": In astronomical contexts, it is sometimes informally referred to simply as "the Crab."
  • The Chandra telescope captured a new image of the Crab.
• As a standard candle: In astrophysics, the Crab Nebula's pulsar is used as a calibration source for measuring high-energy radiation.
  • Scientists used the Crab Nebula as a standard candle to calibrate the new X-ray detector.

Variants and Related Words

• Supernova remnant (SNR): The general term for the structure resulting from a supernova explosion. The Crab Nebula is a specific, famous example.
• Pulsar wind nebula (PWN): A type of nebula powered by the wind from a pulsar. The Crab Nebula is the prototype of this class.
• Messier 1 (M1): Its designation in the Messier Catalogue of nebulous objects.

Synonyms

• M1 (Astronomical catalog name)
• NGC 1952 (New General Catalogue designation)
• Taurus A (Radio source name)

Related Phrases

• Crab Pulsar: Refers specifically to the neutron star at the center of the Crab Nebula.
  • The Crab Pulsar rotates about 30 times per second.

Noun

1. a remnant of a supernova detected first in 1054 AD