Cepheid variables are a type of star that undergo regular pulsations. The length of a Cepheid’s pulsations is always related to its intrinsic, or absolute, brightness in a simple way: The longer its ...
Taking advantage of the very high spatial resolution provided by the Very Large Telescope Interferometer, a team of French and Swiss astronomers [1] has measured directly the change in angular ...
The question of how fast the universe is expanding just keeps getting more confusing. Our two main methods of measuring the acceleration of the universe’s expansion disagree by nine per cent.
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