“Rogue planets.
There are trillions of them in the galaxy roaming interstellar space. One could just fall into the solar system at any time and completely disrupt Earth’s orbit ending life as we know it. They are completely invisible and probably wouldn’t be detected until well past the orbit of Neptune.
The good news is that space is so unimaginably huge that even that many rogue planets is basically a rounding error for the emptiness between stars.”
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Doris 2 year s ago
#7 & #8 - there is nothing "outside" the universe because the expansion of space /creates/ space itself.
#20 - besides the fact that we can directly observe which of these is true (the latter), conceptually the former cannot be true. Think of it this way: if the universe existed infinitely far back, how did we arrive at today?
#20 - besides the fact that we can directly observe which of these is true (the latter), conceptually the former cannot be true. Think of it this way: if the universe existed infinitely far back, how did we arrive at today?
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Lavonne 2 year s ago
Doris,
There is no "expansion" of space. You only fill infinite space with limited physically objects and You waste a lot of time to move from one object (say planet) to another.
There is no "expansion" of space. You only fill infinite space with limited physically objects and You waste a lot of time to move from one object (say planet) to another.
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Evan 2 year s ago
#2 False vacuum decay is part of quantum field theory, and highly improbable. We're all in a simulation, anyway, so no worries.
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Francie 2 year s ago
An objects perception of spacetime is relative to the speed of light. A photon of light experiences zero time. This means when we observe a photon from the Big Bang, it appears to us to have been traveling for ~13.7 billion years, but for the photon, the journey was instantaneous.
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Lucas 2 year s ago
#18 - Anything but metric huh ?
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Alexandria 2 year s ago
“Energy cannot be created or destroyed; it can only be changed from one form to another.”
So when you die where does the energy go? God rest his soul, maybe not
So when you die where does the energy go? God rest his soul, maybe not
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Kenj 2 year s ago
Alexandria,
what energy?
what energy?
#20 - besides the fact that we can directly observe which of these is true (the latter), conceptually the former cannot be true. Think of it this way: if the universe existed infinitely far back, how did we arrive at today?
There is no "expansion" of space. You only fill infinite space with limited physically objects and You waste a lot of time to move from one object (say planet) to another.
So when you die where does the energy go? God rest his soul, maybe not
what energy?