Readers discuss colors, spikes and more in James Webb Space Telescope images
A stunning first photo from the James Webb Space Telescope offers the deepest, sharpest view of space yet. Lisa Grosman “Postcards from the New Space Telescope” (SN: August 13, 2022, p. 30).
JWST uses infrared, a form of light invisible to the human eye, to observe the universe. To visualize the images, the scientists color them.reader John Doman I was wondering how his coloring was done.
JWST images are colored by Joseph DePasquale, Senior Data Imaging Developer and Alyssa Pagan, Science Visuals Developer at the Space Telescope Science Institute in Baltimore. Disgusting man Say. Their rule of thumb is to paint using the wavelengths of light as a guide. say. Intermediate wavelengths are assigned the green and yellow spectrum (SN: March 17, 2018, p. 4). But there are other considerations, such as data on the chemical composition of the material in the image. How to color these elements is more of an art than a science. Disgusting man Say. “He also has subjective artistry.”
reader Stu Cantor We asked why some stars in the JWST image appear to have 8 points (6 large and 2 small points) (see “otherworldly” below).
These are called diffraction spikes, Disgusting man and these are artifacts of the optical configuration of the telescope. In JWST it has two mirrors. One is a hexagonal primary mirror and the other is a small secondary mirror in front of the primary mirror supported by three support beams. When light hits the telescope, it bends at both ends over each of the secondary mirror struts, producing six diffraction spikes. It also creates six spikes on the six edges of the primary mirror. The scientists designed the telescope so that the four tips of the secondary mirror overlap the four tips of the primary mirror. Disgusting man So there are 12 spikes, but only 8 are visible.
Diffraction spikes are not unique to the JWST. “The Hubble Space Telescope image has them too, but there are only four.” Disgusting man Say. “The 8 dots are characteristic of JWST as the signature of the artist.”
in the nose
Scientists have discovered a neural link in the dog’s brain that connects the olfactory system and vision. This may help explain why man’s best friend, the dog, has an excellent sense of smell. laura sanders “New nose and brain link identifier for dogs” (SN: August 13, 2022, p. 9).
The story made some readers reflect on the behavior of their furry friends.
“Now I know why my German Shepherd couldn’t play the simplest version of the shell game.” Ed Hughes I wrote. “Using a bit of dog food and two Dixie cups… A misalignment of the cup hiding the dog food completely confused her. I see his eyes follow the cups. She never picked up a cup of dog food, even though she could. She had pre-identified him with his nose and was completely unaware of anything his eyes detected.
reader Roy R. Ferguson Having been involved in animal search and rescue with his wife for the past 20 years, he was fascinated by the smell of dogs.
“We have learned to allow the K-9 to work as unattended as possible.” Ferguson I wrote. “They always make decisions that seem crazy at the time, but make sense once the whole story is out.”
“Our K-9 found drops of blood in the rain and decomposing humans in various vehicles. Including a wandering man and a 6-year-old child who had been out all night… The discovery of the child was remarkable due to the large amount of odor pollution in the area. Ferguson Added.
“We have no idea how these amazing creatures manage to accomplish such great feats. They go all out for nothing but compliments and toy rewards. Ferguson I wrote. “What happened [us] I mean we’re there to support them, drive and operate the radio. In return, they give the impression that they know what we are doing. “