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The Speed of Light
In Our Time
The Importance of Einstein's Theory of Black Hole
Einstein's theory allowed the prediction and very detailed description of objects like this, which we now call black holes. A black hole of the sort that we suspect sits at the center of most galaxies, including our own would be a billion times heavier than our sun. And its average density is just like that of air. But big black holes are really quite benign. You could be passing across that surface of no return at this moment. And you wouldn't notice anything odd at all. It's only if you try to retrace your steps and go back to base on your distant planet that you would find yourself stubbornly trapped inside this surface.
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