Science & Technology

Hubble captures a stunning Stellawar pool

Hubble Space Telescope image of the spiral galaxy NCG7329 taken with Wide Field Camera 3 (WFC3). Credits: ESA / Hubble & NASA, A. Riess et al.

This stellar vortex is a spiral galaxy named NCG7329 imaged by Hubble’s Wide Field Camera 3 (WFC3). Creating such colorful images using a telescope such as Hubble is not as easy as pointing the camera and clicking. Commercial cameras usually try to collect as much light of all visible wavelengths as possible in order to produce the most vivid images possible. In contrast, the raw images collected by Hubble are always monochromatic. Astronomers usually want to capture a very specific range of wavelengths of light at any time in order to do the best and most accurate science possible. Hubble cameras are equipped with various filters that allow only specific wavelengths of light to reach the camera’s CCD in order to control the wavelength of the light it collects (CCD is the camera’s light sensor. The phone camera also has a CCD). !! ).

Given that a raw Hubble image is monochromatic, how is a colorful Hubble image possible? This is achieved by combining multiple different observations of the same object, obtained using different filters. For example, this image was processed from Hubble observations made using four different filters. Each filter spans different regions of the light spectrum, from UV to optical and infrared. Professional image processors and artists can make informed decisions about the optical colors that best correspond to each filter they use. You can then use that filter to color the captured image as appropriate. Finally, stack the images taken with various filters and it’s done! A colorful image of a distant galaxy has been completed, using colors that represent reality as much as possible.

Hubble captures a stunning Stellawar pool Hubble captures a stunning Stellawar pool

Back to top button