Large Magellanic Cloud (DSS View) with Star Cluster Overlay (Hubble)

Large Magellanic Cloud (DSS View) with Star Cluster Overlay (Hubble)

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Fast Facts
News release ID: STScI-2019-25
Release Date: Apr 25, 2019
Image Use: Copyright
About this image

Astronomers Use Hubble to Tighten the Cosmic Distance Ladder

This is a ground-based telescope's view of the Large Magellanic Cloud, a satellite galaxy of our Milky Way. The inset image, taken by the Hubble Space Telescope, reveals one of many star clusters scattered throughout the dwarf galaxy.

The cluster members include a special class of pulsating star called a Cepheid variable, which brightens and dims at a predictable rate that corresponds to its intrinsic brightness. Once astronomers determine that value, they can measure the light from these stars to calculate an accurate distance to the galaxy. When the new Hubble observations are correlated with an independent distance measurement technique to the Large Magellanic Cloud (using straightforward trigonometry), the researchers were able to strengthen the foundation of the so-called "cosmic distance ladder." This "fine-tuning" has significantly improved the accuracy of the rate at which the universe is expanding, called the Hubble constant.


Tags
Annotated Observations, Galaxies, Magellanic Clouds, Star Clusters, Universe Age/Size, Variable Stars

Credits

NASA, ESA, A. Riess (STScI/JHU), and Palomar Digitized Sky Survey