Cosmology studies the universe's nature, including its size, origin, and laws, with recent focus on the Hubble tension crisis and proposing new physics theories to explain the discrepancies between local universe and CMB measurements. Wendy Freedman's team used giant stars to recalibrate the distance ladder, resolving the Hubble tension by landing between CMB and cepheid measurements.
Insights
The Hubble tension crisis arises from discrepancies between local universe measurements and the CMB, potentially due to new physics, calibration errors, or cosmological model flaws.
Wendy Freedman's team successfully recalibrated the distance ladder using giant stars, resolving the Hubble tension by aligning measurements between the CMB and cepheids.
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Recent questions
What is cosmology?
The study of the universe's nature, origin, and laws.
What is the Hubble constant?
A measure of the universe's expansion rate.
What are Cepheid variables?
Pulsating stars used as standard candles for measuring distances.
What is the Hubble tension crisis?
Discrepancies between local and cosmic measurements of the universe's expansion rate.
Why are giant stars considered as standard candles?