M
- MACHOs
- MERLIN
- Mach's Principle
- Magellanic Clouds
- Magellanic Stream
- Magnetar
- Main Asteroid Belt
- Main Sequence Lifetime
- Mars
- Masers
- Mass
- Megaparsec
- Mercury
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- Meridian Transit
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- Milky Way
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- Mirror
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- Molecular Hydrogen
- Molecule
- Moment of Inertia
- Momentum
- Monolithic Collapse
- Moon
- Mopra Telescope
- Morgan-Keenan Luminosity Class
- Morphological Peculiarities
- Morphology Density Relation
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