Dark Energy
A theoretical study proposes that collapsing massive stars may form gravastars rather than black holes by creating miniature universes inside themselves. The model offers the first dynamic explanation for how these exotic objects could arise from ordinary stellar matter.
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The Dark Energy Spectroscopic Instrument (DESI) at Kitt Peak National Observatory has finished its five-year sky survey ahead of schedule, capturing spectra from 47 million galaxies and quasars—six times more than all previous surveys combined—plus 20 million stars. This creates the most detailed high-resolution 3D map of the universe to date, exceeding initial goals of 34 million objects and offering new insights into cosmic structure and potentially weakening dark energy.
Astronomers have found evidence that dark energy may be evolving rather than constant, challenging Einstein's longstanding cosmological model. A new study indicates that time-varying dark energy models fit observational data better, potentially altering our understanding of the universe's fate. Researchers from the University of Chicago analyzed data from major surveys to support this idea.