A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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just because the question contains a formula!
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Imaging of astronomical objects or large regions of the sky.
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an electrical appliance using the principles of a motor.
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concerned with temperatures below 123 K (-150 deg C), widespread usage in gas liquefaction and storage, vacuum science and supercondcutivity
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a hypothetical form of radioactive decay in which the proton decays into lighter subatomic particles. There is currently no experimental evidence that proton decay.
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an approach to spacetime focused on null (light-like) geodesics, instead of points (events).
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A set of theories that attempt to take the basics of general relativity, and extned it in such a way that it solves various problems. This applies to Milgrom's MOND proposal, but also includes such o…
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a difficult technical problem that limits the usability of renewable sources of energy to replace traditional fossil fuel sources
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a method of isolating divergencies in scattering amplitudes.