The rate at which the universe is expanding, known as the Hubble constant, is one of the fundamental parameters for understanding the evolution and ultimate fate of the cosmos. However, a persistent difference called the 'Hubble Tension' is seen between the value of the constant measured with a wide range of independent distance indicators and its value predicted from the big bang afterglow.
The rate at which the universe is expanding, known as the Hubble constant, is one of the fundamental parameters for understanding the evolution and ultimate fate of the cosmos. However, a persistent difference called the"Hubble Tension" is seen between the value of the constant measured with a wide range of independent distance indicators and its value predicted from the big bang afterglow.
is expanding—a number called the Hubble constant. Our sign is written into the stars in distant galaxies.
"Hubble has better visible-wavelength resolution than any ground-based telescope because it sits above the blurring effects of Earth's atmosphere. As a result, it can identify individual Cepheid variables in galaxies that are more than a hundred million light-years away and measure the time interval over which they change their brightness."
"The first step involves observing Cepheids in a galaxy with a known, geometric distance that allows us to calibrate the true luminosity of Cepheids. For our program that galaxy is NGC 4258. The second step is to observe Cepheids in the host galaxies of recent Type Ia supernovae."
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