All exams GA
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Dark matter is a mysterious and invisible stuff that constitutes about 85% of the matter existing in the universe, yet is not detectable directly using current instruments. It doesn’t emit, absorb, nor reflect light (or any form of electromagnetic radiation); hence it is “dark” and cannot be viewed.
Some Key Points about Dark Matter
- Invisible Medium:
- Dark matter cannot emit, absorb, or reflect light; hence, it is invisible.
- The Majority of Universe Mass:
- Dark matter is 85% of the universe’s matter.
- Interaction through Light:
- Dark matter interacts through gravity only.
- Gravitational Outstanding features:
- Dark matter exists with one and only property, the effects that can be measured using normal visible matter.
- It cannot be detected through any current modes of detection, as it does not interact with electromagnetic forces.
- A galaxy’s rotation curve is influenced by dark matter.
- Mostly invisible:
- Dark matter is something that has been inferred through indirect evidence.
