George Clark, astrophysicist who led discoveries of celestial gamma-ray sources, dies aged 94

An X-ray look at the heart of powerful quasars

Stars die much brighter than they live. This can be seen in the new picture of "James Webb", who caught the rare star Wolf - Raye before her death. Soon it will explode as a supernova, and for now you can observe a bright nebula from the shells thrown off by the star around

Among those who've experienced emotional trauma, PTSD symptoms may be triggered through the same neurobiological pathways activated by physical trauma, including functional or structural alterations of the hippocampus and prefrontal cortex, epigenetic modifications, and HPA axis dysfunction.