unit of length

Micro Booster Neutrino Experiment (preceded by MiniBooNE)

See may or might?

Measure of radiation dose; symbol mSv

See sievert

Mini Booster Neutrino Experiment (succeeded by MicroBooNE)

Merit-Oriented Advancement Scheme (replaced by MAPS)

Monopole and Exotics Detector At the LHC

Memorandum of understanding

Employed member of the personnel (staff/fellow/apprentice)

Use Ms for preference over Mrs or Miss (see gender neutrality)

Muon to electron conversion experiment (Fermilab)

The prefix "multi" does not take a hyphen.

multiband

multibeam

multichannel

multidimensional

multidisciplinary

multiframe

multifrequency

multilateral

multilingual

multimedia

multinational

multipath

multiplex

multipurpose

use hyphen

milliwatts

North Area experiment 61 (SHINE)

Use the full name on first mention, just the surname thereafter. Do not use titles:

John Smith is leading the particle-accelerator team. "I hope to accelerate lots of particles," says Smith.

For middle initials, add a full stop and a space after each capital letter:

E. O. Wilson is a famous evolutionary biologist.

National Aeronautics and Space Administration

Acronym doesn’t need spelling out for the CERN Courier

Use "ndashes" – like these – to separate clauses in sentences. The HTML code to use is –

Use hyphens elsewhere (compound adjectives, for example). 

The particle detector – housed in a custom-built cavern 100 metres below ground – is made up of concentric subdetectors. 

not nebulae