New research shows that the distribution of massive, medium and light stars vary greatly between close and distant galaxies. It looks like more distant galaxies tend to have more of the massive stars.
If confirmed, it could have implications to our understanding of galaxy evolution. Bigger number of massive stars should lead to more supernovas and more black holes than previously anticipated.
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Astronomers identified the most distant stars still belonging to our own galaxy. The variable RR Lyrae stars have a unique pulsating period related to its brightness which allows scientists to determine their distance. It was found to be 1,2 million light years away - almost half distance to our neighboring big galaxy - Andromeda.
Astronomers identified 87 new distant galaxies in data from James Webb Space Telescope’s first year of observations. All of them have a red shift higher than 11 and up to 20 which indicates great distance and age.
Scientists were able to measure the cosmic optical background (COB) thanks to the data from New Horizons space probe at the edge of the Solar system. The light is significantly brighter than what light from known sources can explain. According to a new study led Teresa Symons it is two to three times brighter.