An image believed to be that of a hole-punch cloud. Scientists say airplanes create these patterns when they fly through certain types of clouds. The water in the clouds can turn to rain or snow and fall to the ground.
H. Raab/Vesta/Wikimedia Commons
This image from April 27 shows a series of tornadoes forming over Alabama and Mississippi. Captured from a satellite orbiting located at a fixed location above Earth, images like these help track trends in weather patterns. Another set of polar-orbiting satellites are useful for long-term forecast predictions.
NASA Earth Observatory
Scientists have known for a long time that nicotine decreases appetite among smokers, but they didn't know why. A new study finds that nicotine triggers a response in certain specific brain cells known to regulate appetite.
NASA engineer Ernie Wright looks on as the first six primary mirror segments for the James Webb Space Telescope are prepped to begin final cryogenic testing at NASA's Marshall Space Flight Center. The telescope will have 18 primary mirror segments.