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Has the most important downside in cosmology lastly been solved?

May 9, 2024
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Has the most important downside in cosmology lastly been solved?
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This enchanting spiral galaxy can be found in the constellation of Ursa Major (the Great Bear). Star-studded NGC 3972 lies about 65 million light-years away from Earth, meaning that the light that we see now left it 65 million years ago, just when the dinosaurs became extinct. NGC 3972 has had its fair share of dramatic events. In 2011 astronomers observed the explosion of a Type Ia supernova in the galaxy (not visible in this image). These dazzling objects all peak at the same brightness, and are brilliant enough to be seen over large distances. NGC 3972 also contains many pulsating stars called Cepheid variables. These stars change their brightness at a rate matched closely to their intrinsic luminosity, making them ideal cosmic lighthouses for measuring accurate distances to relatively nearby galaxies. Astronomers search for Cepheid variables in nearby galaxies that also contain a Type Ia supernova so they can compare the true brightness of both types of stars. That brightness information is used to calibrate the luminosity of Type Ia supernovae in far-flung galaxies so that astronomers can calculate the galaxies' distances from Earth. Once astronomers know accurate distances to galaxies near and far, they can determine and refine the expansion rate of the universe. This image was taken in 2015 with Hubble's Wide Field Camera 3, as part of a project to improve the precision of the Hubble constant ? a figure that describes the expansion rate of the universe. Text: European Space Agency

A spiral galaxy within the constellation of Ursa Main

NASA, ESA, A. Riess (STScI/JHU)

The next is an extract from our month-to-month Launchpad e-newsletter, wherein resident house skilled Leah Crane journeys via the photo voltaic system and past. You’ll be able to join Launchpad without spending a dime right here.

Cosmologists have been preventing over the Hubble fixed, a quantity that represents the speed of growth of the universe, since earlier than I used to be born. Now, it might lastly be settled.

The talk concerning the growth fee of the universe kicked off within the Seventies, when astronomer Gérard de…



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