Are robotic missions really more efficient than human space exploration? Ian Crawford explains why planetary astronomers should support human space exploration.
What if the first stars were only 1-50 times as massive as the Sun? Would they still be able to enrich the intergalactic medium and trigger the birth of the next generation of stars?
Every 27.1 years, the ε Aurigae system gets dimmer and stays dim for two years. What is causing the dip in brightness? Have Hoard et al. uncovered the invisible monster?
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In this series of papers, the authors apply new analysis techniques to data from several galaxy redshift surveys to uncover acoustic waves from the early universe and refine measurements of cosmological parameters.