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How Big Are Black Holes? Black holes can be big or small. Scientists think the smallest black holes are as small as just one atom. These black holes are very tiny but have the mass of a large mountain. Mass is the amount of matter, or "stuff," in an object.
Time is the expansion of space
originally posted by: Aleister
And just to round it out, as I've said several times on ATS and elsewhere (drum roll for my pet theory with absolutely no maths to back it up), gravity and time are the same thing.
originally posted by: bobs_uruncle
a reply to: f4andHALFtoads
Using your current idea that time is produced by expansion of the universe, let's look at a couple of situations...
The first under this concept is that if expansion stops, then time stops, which means all motion stops. Motion is directly referenced to time and if this were the case, then the universe would become a static model. But would expansion stop before entropy turned the universe into a rather sparse soup of individual quarks?
The second, would be that if expansion reverses, eg contraction starts, then the arrow of time moves backwards, replaying all of existence in reverse right back to the big bang, where time I presume would move forwards again after the implosion and subsequent expansion.
Just a thought ;-)
Cheers - Dave