a tour and activity plan has been submitted, if required, and activity consent forms are signed, distributed, and collected. Some of those behemoths probably exploded via a pair-instability mechanism. It made no sense. Why did our prediction come true? The results were consistent with my previous analyses: many solar masses of nickel 56 and a relative abundance of elements matching the predictions of pair-instability models. To do so, we would need to measure the location of the supernova with great precision. So instead of oxygen fusion, something else would happen: physicists call it pair production. If it was a single star, its brightness (perhaps a million times that of the sun) suggested it was massive100 times the sun's mass. We thought that Keck could help us, and we were granted a single night of observing time in November 2005. In matter that is hot enough, energetic particles such as nuclei and electrons emit very powerful lightphotons so energetic that they are in the gamma-ray spectrum.
Documents Similar To Super Science Concoctions. Three-Dimensional Super-Resolution Imaging by Stochastic Optical Reconstruction. Aaas login provides access to Science for aaas members, and access to other journals.
Shrinivas Kulkarni of the California Institute of Technology urged young Caltech researchersmyself among themto apply for observing time. When I did a first, rough analysis, I could not believe what I saw. We analyzed its spectra in detail and how its light evolved in time. Confirm plans with families, including place, time, and transportation. That evening of observing set me on a research path that ultimately helped to overturn long-standing views of how large stars can become and how these giants die. The core then crosses successive thresholds toward the fusion of increasingly heavy elementsfirst helium to carbon, then carbon to oxygen, and.
Then, the first stars might have been massive enough to explode as pair-instability supernovae. Each stage between thresholds may last thousands to billions of years, depending on how fast the star's nuclear burning affects its core temperature and pressure. I was thinking of stellar explosions of an entirely different kindthose called gamma-ray burstswhen a chance event in 2006 led to another surprising finding, which suggested not only that giant stars might go supernova but also that they could do so in a startling way. This time, however, the gods seemed much less kind: the weather was terrible.