crab nebula
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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
- a remnant of a supernova detected first in 1054 AD