It seems you are seeking to differentiate between dark matter and baryonic matter. Here’s a brief overview of each:
Dark Matter:
- Does not interact with electromagnetic radiation: Dark matter does not emit, absorb, or reflect light, making it invisible and detectable only through its gravitational effects.
- Has not been observed directly: While dark matter has not been detected directly, its presence is inferred from gravitational effects on visible matter, radiation, and the large-scale structure of the universe.
- Interacts gravitationally with baryonic matter: Dark matter does interact with baryonic matter (the 'normal' matter that makes up stars, planets, and living organisms) through gravity.
- Does not interact with baryonic matter: Dark matter is believed to have no electromagnetic interactions with baryonic matter, meaning it doesn't interact in ways that would produce detectable electromagnetic signals.
Baryonic Matter (Normal Matter):
- Interacts with electromagnetic radiation: Baryonic matter does interact with electromagnetic radiation, which is why we can see and observe it through light.
- Has been observed directly: Baryonic matter is all the matter that makes up the visible universe and can be directly observed and measured, including stars, planets, and galaxies.
- Interacts with other baryonic matter: Baryonic matter can interact with other baryonic matter via electromagnetic forces (such as chemical reactions) and gravitational forces.
In summary, dark matter is largely mysterious and non-interactive with electromagnetic radiation, while baryonic matter is the matter we can observe and measure in the universe.