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   Why is dark matter invisible?

   • The fact that dark matter is weakly interacting with light means that this process occurs only very, very rarely (or maybe not at all!), so it appears effectively "invisible" to us when looking with light. Searching for signs of dark matter is one of the biggest research areas in modern cosmology.

   If dark matter is 'invisible,' how do we know it exists? | Space

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   How does light affect dark matter?

   • One of the ways we "'see" matter is if it makes its own light (like the sun) and if light bounces off its surface (as it does off your skin). The fact that dark matter is weakly interacting with light means that this process occurs only very, very rarely (or maybe not at all!), so it appears effectively "invisible" to us when looking with light.

   If dark matter is 'invisible,' how do we know it exists? | Space

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   Why is dark matter so difficult to detect?

   • Dark matter is a hypothetical form of matter that does not absorb, reflect, or emit electromagnetic radiation. This makes it incredibly challenging to detect directly with current technology. It’s “dark” not because it’s black or absence of light but because it does not interact with light or any other form of electromagnetic radiation.

   What Is Dark Matter? - Science Notes and Projects

   sciencenotes.org/what-is-dark-matter/

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   What do we know about dark matter?

   • Dark matter makes up over 80% of all matter in the universe, but scientists have never seen it. We only assume it exists because, without it, the behavior of stars, planets and galaxies simply wouldn't make sense. Here is what we know about it, or rather, what we think we know. Related: If dark matter is 'invisible,' how do we know it exists?

   What is dark matter? | Space

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2. www.space.com › if-dark-matter-invisible-how-do-weIf dark matter is 'invisible,' how do we know it exists?

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   May 4, 2023 · Dark matter is effectively invisible because it is "weakly interacting" with light. One of the ways we "'see" matter is if it makes its own light (like the sun) and if light bounces off its ...

3. www.astronomy.com › science › if-dark-matter-isIf dark matter is invisible, then how do we detect it?

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   Jan 22, 2024 · Dark matter neither absorbs nor gives off light, which is why astronomers have named it dark. But because dark matter has mass, it does interact with normal matter — including photons...

4. www.nationalgeographic.com › article › dark-matterDark Matter and Dark Energy | National Geographic

   www.nationalgeographic.com › article › dark-matter

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   Unlocking the Mystery. Scientists have not yet observed dark matter directly. It doesn't interact with baryonic matter and it's completely invisible to light and other forms of...

5. sciencenotes.org › what-is-dark-matterWhat Is Dark Matter? - Science Notes and Projects

   sciencenotes.org › what-is-dark-matter

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   Jun 21, 2023 · Dark matter is an invisible type of matter that exerts gravitational effects on light and regular matter. Dark matter is a hypothesized form of matter that does not interact with light or other forms of electromagnetic radiation, but exerts gravitational effects on visible matter, light, and the structure of the universe.

6. theconversation.com › we-dont-know-if-dark-matterWe don’t know if dark matter exists. So why do astronomers ...

   theconversation.com › we-dont-know-if-dark-matter

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   Aug 30, 2022 · A comparison of star-forming galaxies suggests, surprisingly, that dark matter and visible matter do interact – taking us closer to understanding what keeps the galaxies together. We don’t...

7. Videos

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8. science.nasa.gov › resource › dark-matterDark Matter - NASA Science

   science.nasa.gov › resource › dark-matter

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   Sep 30, 2020 · Scientists call it dark matter. It is scattered in an intricate web that forms the skeleton of our universe. Dark matter is invisible, only revealing its presence by pushing and pulling on objects we can see.