Explainer: What is mass?

When it comes to electrons, Higgs bosons or photons, they don't have much going for them. They possess spin, charge, mass and … that's about it.

Image: LISA Pathfinder electrode housing box

This photo, suggestive of an old-fashioned lift cage, in fact shows inside a much smaller enclosure: one of the electrode housing boxes that will fly on ESA's LISA Pathfinder mission, planned for launch later this year. The ...

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