
1) It may be seen from space 2) Supernova remnant in taurus 3) Supernova remnants in taurus
Found on
https://www.crosswordclues.com/clue/crab-nebula

The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. Corresponding to a bright supernova recorded by Chinese astronomers in 1054, the nebula was observed later by English astronomer John Bevis in 1731. At an apparent magnitude of 8.4, comparable to that of the...
Found on
http://en.wikipedia.org/wiki/Crab_Nebula

Exploding remains of a supernova that was observed by Chinese astronomers in A.D
Found on
http://jot101.com/2015/05/a-z-of-science-fiction-words/

(catalog numbers NGC 1952 and M1), probably the most intensely studied bright nebula, in the constellation Taurus, about 5,000 light-years from ... [6 related articles]
Found on
http://www.britannica.com/eb/a-z/c/153
(M1, NGC 1952) Crab Nebula. This image combines 24 individual exposures obtained with the Hubble Space Telescopes's Wide Field Planetary Camera 2 in 1999 and 2000. Images were taken through different color filters, each revealing different elements. Blue indicates neutral o...
Found on
http://www.daviddarling.info/encyclopedia/C/Crab.html

[
n] - a remnant of a supernova detected first in 1054 AD
Found on
http://www.webdictionary.co.uk/definition.php?query=Crab%20Nebula
noun a remnant of a supernova detected first in 1054 AD
Found on
https://www.encyclo.co.uk/local/20974

Cloud of gas 6,000 light years from Earth, in the constellation Taurus. It is the remains of a star that, according to Chinese records, exploded as a supernova observed as a brilliant point of light on 4 July 1054. At its centre is a pulsar that flashes 30 times a second. It was named by Lord Rosse after its crablike shape
Found on
https://www.encyclo.co.uk/local/21221

the remnant of a supernova explosion, observed in 1054 a.d., in the constellation Taurus.
Found on
https://www.infoplease.com/dictionary/crab-nebula
No exact match found.