Astrophysics & Cosmology

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Symmetry: Cosmic Inflation

Cosmic inflation refers to a period of rapid, accelerated expansion that scientists think took place about 14 billion years ago.

Symmetry: How to Weigh a Galaxy Cluster

Step on a scale and you’ll get a quick measure of your weight. Weighing galaxy clusters, groups of hundreds or thousands of galaxies bound together by gravity, isn’t so easy. But scientists have many ways to do it.