Eli5 if the universe is expanding, then why isn’t the earth, and everything in it (us) getting measurably bigger too?
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The universe is expanding, that doesn’t mean items within it grow, they just distance themselves from eachother and that we do observe.
Imagine a balloon you put some marbles into while it’s completely deflated. Now inflate the balloon. Marbles stay the same size but the space between them increases.
The speed at which the universe is expanding is not locally sufficient to overcome the gravity (and other forces) keeping the Earth together.
The speed at which the universe is expanding is not locally sufficient to overcome the gravity (and other forces) keeping the Earth together.
The speed at which the universe is expanding is not locally sufficient to overcome the gravity (and other forces) keeping the Earth together.
The universe is expanding, that doesn’t mean items within it grow, they just distance themselves from eachother and that we do observe.
Imagine a balloon you put some marbles into while it’s completely deflated. Now inflate the balloon. Marbles stay the same size but the space between them increases.
The universe is expanding, that doesn’t mean items within it grow, they just distance themselves from eachother and that we do observe.
Imagine a balloon you put some marbles into while it’s completely deflated. Now inflate the balloon. Marbles stay the same size but the space between them increases.
Metric expansion is incredibly weak over distances smaller than galaxy clusters, so you just don’t see any local changes. Gravity can easily overwhelm metric expansion, although if metric expansion continues to accelerate indefinitely, you end up with a “Big Rip” scenario.
Metric expansion is incredibly weak over distances smaller than galaxy clusters, so you just don’t see any local changes. Gravity can easily overwhelm metric expansion, although if metric expansion continues to accelerate indefinitely, you end up with a “Big Rip” scenario.
Metric expansion is incredibly weak over distances smaller than galaxy clusters, so you just don’t see any local changes. Gravity can easily overwhelm metric expansion, although if metric expansion continues to accelerate indefinitely, you end up with a “Big Rip” scenario.
There is a very strong force holding the Earth, the sun, and the moon together known as gravity, which prevents them from separating on their own. The universe’s expansion is unnoticed from our own galaxy. It’s really on much larger scales, between galaxies, where the universe’s expansion is noticeable.
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