[ExI] The Planck era: Imagining our infant universe

[BillK]

On Sat, 23 Apr 2022 at 00:48, William Flynn Wallace via extropy-chat
<extropy-chat at lists.extropy.org> wrote:
>
> Is dark matter still just hypothetical?  bill w
> _______________________________________________


In the sense that we don't know what it is, then yes.
We can see the gravitational effects that hold spinning galaxies
together, but we can't see any physical matter causing those
gravitational effects, so we call it 'dark matter'.


BillK