Grand Canyon of the Yellowstone (by gfpeck)
flancher - informal; closest English translation is to falter or ‘choke’; to fail mid-way through something and be unable to finish
grogner - to grumble, groan, grunt
(un) beau gosse - hot guy (slang). Apparently, many of my students’ favourite word ever: during a class game today, the teams were ‘Les Beaux Gosses’ vs ‘Les Anti-Beaux Gosses’.
un thon - a tuna; or a really ugly guy/girl
raconter des salades - to talk crap; literally to ‘tell salads’
The term “false color” is used to describe what astronomers (and others) often do to images to make them more comprehensible. Long ago, when radio astronomers first started generating images of sources, they wound up with essentially images that were just shades of gray - ranging from pure black to pure white. Each shade represented the intensity of the radio emission from a particular part of the object. Radio astronomers took their shades-of-gray images and converted them to color ones by assigning red to the most intense radio emission and blue to the least intense emission recorded on the image. Intermediate colors (orange, yellow, and green) were assigned to the intermediate levels of radio intensity. Black was assigned to places in the image in which there appeared to be no radio emission.
This process allows astronomers to more quickly recognize features in the images. Typically, when looking at a photograph, the human eye can only distinguish about 16 shades of gray from one another. Using millions of colors, instead, we can often bring out details in an image that we might otherwise miss. These days, just about every area of astronomy creates “false color” images. Remember - electromagnetic radiation does not have “real” color except for the radiation that has a wavelength of between 400 and 700 nm. That little range is called the “visible" spectrum, since it is what we humans beings see with our eyes!
text and photos from NASA
last photo source
Human neural stem cells (shown in red), originally reprogrammed from adult skin cells, differentiate efficiently into brain cells (shown in green), after being cultured with star-shaped cells called astrocytes.
Image: Chen lab, Penn State University