Reasons to Believe

Using Globular Clusters to Measure Galactic Distances

TNRTB Archive - Retained for reference information

A team of astronomers has developed a new technique to measure intergalactic distance, providing a new tool to test RTB’s cosmic creation model. Globular clusters typically contain hundreds of thousands of stars—making them visible in distant galaxies. Because of their brightness, astronomers can measure the half-light radius (the radius containing half the light from the cluster) for each cluster. After accounting for differences in the galaxy environments containing the globular clusters, the team demonstrated that the average half-light radius for all clusters in a galaxy provides a standard ruler for distance estimation to the galaxy. Astronomers can now use this new tool to test scientific models of how the universe formed and developed, including RTB’s cosmic creation model.

o   Andrés Jordán et al., “The ACS Virgo Cluster Survey. X. Half-Light Radii of Globular Clusters in Early-Type Galaxies: Environmental Dependencies and a Standard Ruler for Distance Estimation,” The Astrophysical Journal 634 (2005): 1002-19.


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o   Hugh Ross, “A Beginner’s—and Expert’s—Guide to the Big Bang”

·         Product Spotlight

o   Journey Toward Creation, 2nd ed., with Hugh Ross


Subjects: Scientific Evidence for a Young Earth? , Scientific Evidence for an Old Earth

Dr. Hugh Ross

Reasons to Believe emerged from my passion to research, develop, and proclaim the most powerful new reasons to believe in Christ as Creator, Lord, and Savior and to use those new reasons to reach people for Christ. Read more about Dr. Hugh Ross.