When you picÂture the giant forÂmaÂtions of gasses and space dust that make up a nebÂuÂla, maybe you see the deliÂciousÂly garÂish CGI of Guardians of the Galaxy. The look of the MarÂvel uniÂverse is, of course, inspired by eye-popÂping images of nebÂuÂlae takÂen by the HubÂble teleÂscope, images that have appeared rouÂtineÂly for the past three decades in the pages of NationÂal GeoÂgraphÂic, DisÂcovÂer, and your favorite screen savers.
Whether you’re into sci-fi superÂhero flicks or not, you’ve sureÂly stared in awe and disÂbeÂlief at these phoÂtographs: ghostÂly, glowÂing, resemÂbling the illusÂtraÂtions of outÂer space by cerÂtain pulp sci-fi illusÂtraÂtors twenÂty years before the HubÂble was launched into orbit in 1990. If these images seem too painterÂly to be real, it’s because they are, as the Vox video above explains, to a great degree, prodÂucts of phoÂtoÂgraphÂic art and imagÂiÂnaÂtion.

The HubÂble teleÂscope only takes images in black and white. The images are then colÂorized by sciÂenÂtists. Their work is not pure fanÂtaÂsy. A process called “broadÂband filÂterÂing” allows them to reaÂsonÂably estiÂmate a range of colÂors in the black and white phoÂto. Some imagÂiÂnaÂtive license must be takÂen “to show us porÂtions of the image that would nevÂer have been visÂiÂble to our eyes in the first place,” notes PetaPixÂel. “For examÂple: turnÂing cerÂtain gasses into visÂiÂble colÂor in a phoÂtoÂgraph.”
In an impresÂsive few minÂutes, the Vox explainÂer digs deep into the sciÂence of optics to explain how and why we see colÂor as comÂbiÂnaÂtions of three waveÂlengths. The sciÂence has been “the guidÂing prinÂciÂple in colÂorÂing black and white images” since the turn of the 20th cenÂtuÂry. We learn above how broadÂband filtering—the phoÂtoÂgraphÂic techÂnique bringÂing us full-colÂor galacÂtic fever dreams—originated in the earÂliÂest experÂiÂments in colÂor phoÂtogÂraÂphy.

In fact, the very first colÂor phoÂtoÂgraph ever takÂen, by physiÂcist James Clerk Maxwell in 1861, used a very earÂly verÂsion of the techÂnique HubÂble sciÂenÂtists now use to colÂorize images of space, comÂbinÂing three black and white phoÂtos of the same object, takÂen through three difÂferÂent-colÂored filÂters. GivÂen the advances in imagÂing techÂnolÂoÂgy over the past 100+ years, why doesn’t the powÂerÂful space teleÂscope just take colÂor picÂtures?
It would comÂproÂmise the Hubble’s priÂmaÂry purÂpose, to meaÂsure the intenÂsiÂty of light reflectÂing off objects in space, a meaÂsureÂment best takÂen in black and white. But the sciÂenÂtifÂic instruÂment can still be used as cosÂmic paintÂbrush, creÂatÂing jaw-dropÂping images that themÂselves serve a sciÂenÂtifÂic purÂpose. If you were disÂapÂpointÂed to learn that the phoÂtogÂraÂphy fuelÂing our our space imagÂiÂnaÂtion has been docÂtored, watch this video and see if a sense of wonÂder isn’t restored.
RelatÂed ConÂtent:
The BeauÂty of Space PhoÂtogÂraÂphy
Josh Jones is a writer and musiÂcian based in Durham, NC. FolÂlow him at @jdmagness






















