Why is Dark Matter completely invisible to conventional telescopes despite its abundance?
Answer
It does not emit, reflect, or absorb light or any other form of electromagnetic radiation.
Dark matter earns its designation 'dark' because it lacks any interaction with the electromagnetic spectrum. Unlike normal matter, which we see because it emits (like stars) or reflects (like planets) light, dark matter does not participate in this interaction pathway. Since conventional telescopes rely exclusively on detecting electromagnetic radiation—including visible light, radio waves, and X-rays—dark matter remains fundamentally invisible to these instruments. Its presence is only inferred indirectly through its pervasive gravitational influence on visible objects.
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