Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. ASCA has provided recent evidence that high energy cosmic rays are formed in the expanding gas from a supernova . During ASCA's three years of operation, it has also yielded valuable data on quasars , supernova remnants , dwarf novae , pulsars , clusters of galaxies , and the mysterious X-ray background radiation that appears to come from all directions.
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