19 relations: Astronomical filter, Caldwell catalogue, Crescent Nebula, Cygnus (constellation), Earth, Emission nebula, Euro, Gamma Cygni, Light-year, New General Catalogue, Red giant, Sharpless catalog, Shock wave, Soap Bubble Nebula, Stellar wind, William Herschel, Wolf–Rayet star, WR 136, X-ray.
An astronomical filter is a telescope accessory consisting of an optical filter used by amateur astronomers to simply enhance the details of celestial objects (much as with amateur photography).
The Caldwell Catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers.
The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth.
Cygnus is a northern constellation lying on the plane of the Milky Way, deriving its name from the Latinized Greek word for swan.
Earth is the third planet from the Sun and the only astronomical object known to harbor life.
An emission nebula is a nebula formed of ionized gases that emit light of various wavelengths.
The euro (sign: €; code: EUR) is the official currency of the European Union.
Gamma Cygni (γ Cygni, abbreviated Gamma Cyg, γ Cyg), also named Sadr, is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross.
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
The New General Catalogue of Nebulae and Clusters of Stars (abbreviated as NGC) is a catalogue of deep-sky objects compiled by John Louis Emil Dreyer in 1888.
A red giant is a luminous giant star of low or intermediate mass (roughly 0.3–8 solar masses) in a late phase of stellar evolution.
The Sharpless catalog is a list of 313 HII regions (emission nebulae), intended to be comprehensive north of declination −27°.
In physics, a shock wave (also spelled shockwave), or shock, is a type of propagating disturbance.
The Soap Bubble Nebula, or PN G75.5+1.7, is a planetary nebula in the constellation Cygnus, near the Crescent Nebula (NGC 6888).
A stellar wind is a flow of gas ejected from the upper atmosphere of a star.
Frederick William Herschel, (Friedrich Wilhelm Herschel; 15 November 1738 – 25 August 1822) was a German-born British astronomer, composer and brother of fellow astronomer Caroline Herschel, with whom he worked.
Wolf–Rayet stars, often abbreviated as WR stars, are a rare heterogeneous set of stars with unusual spectra showing prominent broad emission lines of highly ionised helium and nitrogen or carbon.
WR 136 is a Wolf–Rayet star located in the constellation Cygnus.
X-rays make up X-radiation, a form of electromagnetic radiation.