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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.

X-ray Laser Measures Leaping Electrons

In an experiment at SLAC's X-ray laser, scientists split molecules into two fragments using pulses of infrared light, and then used X-ray pulses to observe the transfer of electrons.

A Look Inside SLAC’s Battery Lab

Tucked in a small laboratory at the Department of Energy's SLAC National Accelerator Laboratory, a team of scientists from the Stanford Institute for Materials and Energy Sciences (SIMES) is making and testing new types of lithium-ion batteries. Their goal: create a battery five times better than the ones we use today.