this post was submitted on 30 Jul 2023
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Let's pretend that you have a basket with 100 apples. You know apples are about 100g each, because you weighed 10 of the them and all of the apples seem about the same size. You know that basket weighs 1000g. You put the whole thing on a scale and find it weighs 500,000g. You know something else is in that basket. You aren't sure what, and frankly it doesn't make sense, but trying different scales and remeasuring more individual apples gives the same result. So you decide that there must be something you can't see but must exist. That's dark matter/energy.
Why isn't it called "cold matter"?
Don't we just not see it because it's not burning?
Couldn't the unseen mass be clouds, planets and black wholes?
No, because those would also interact with other things like electromagnetic radiation, light, etc. Dark matter only interacts with normal matter via gravity.
Dark matter is admittedly a bit of a misnomer but that's what everyone's been using for years 🤷🏻♂️