In addition to this mysterious energy, scientists have also discovered that most of the universe is invisible . They call this dark matter , but that’s a little confusing because we can’t see it. A better way to think of this unknown substance is invisible matter due to the fact that it’s not visible to any of our instruments.
So how did we discover these strange pieces of our universe? Calculations to determine the rotation rate of our universe show that there must be more mass than we can see. In other words, the observable universe just isn’t heavy enough to cause the speed at which we are
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A Universe From Nothing - Book Summary
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