science & techESA/Hubble

Hubble's candyfloss clouds get their colours from scientific choices, not guesswork

the gist

This Hubble Picture of the Week shows dusty gas clouds in the Large Magellanic Cloud, a dwarf galaxy about 160,000 light-years away and the largest of the Milky Way's satellite galaxies. The image combines five filters, some capturing ultraviolet and infrared light that human eyes cannot see. Image processors assign a colour to each filter, usually blue or purple for shorter wavelengths and red for longer ones, so the colours show information beyond human vision. The wispy clouds resemble brightly coloured candyfloss, and many other colour schemes could be used to produce different images.

so what

Colour in astronomy images is a map of wavelengths, so it reveals details such as which gases are glowing. Knowing how colours are assigned helps readers judge what they are seeing. It also shows how telescopes extend our view beyond visible light.

fun fact

The Large Magellanic Cloud is visible to the naked eye from the Southern Hemisphere.

ESA/Hubble · CC BY 4.0

Image: ESA/Hubble & NASA, C. Murray