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EvC Forum ⇒ Science Forums ⇒ Big Bang and Cosmology ⇒

Expansion of the Universe

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Author Topic:   Expansion of the Universe
jar
Member (Idle past 425 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004

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Message 6 of 31 (605353)
02-18-2011 5:56 PM 		Reply to: Message 5 by Taq
02-18-2011 5:54 PM

Taq writes:
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Do I understand this correctly and does this mean that objects like planets are expanding dimensionally? I'm sure that the size of material objects, even stars, is so small that it would be impossible to measure but over billions of years would there be a mearurable expansion in something the size of a planet?
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You also need to factor in gravity. Yes, space is expanding everywhere, including the space within planets and stars. However, this expansion is very, very small for short distances. Over these short distances gravity is able to easily overwhelm the force of expansion. Keep in mind, this is for the current expansion rate.
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If my understanding is correct, the expansion rate is accelerating. There might very well be a time in the future when the expansion rate is high enough to overcome the gravity within a planet. This is called the "Big Rip".
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Gravity is one thing, but what about the much stronger forces that operate over even shorter differences?
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Anyone so limited that they can only spell a word one way is severely handicapped!
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jar
Member (Idle past 425 days)
Posts: 34026
From: Texas!!
Joined: 04-20-2004

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Message 9 of 31 (605376)
02-18-2011 8:33 PM 		Reply to: Message 8 by JonF
02-18-2011 8:30 PM

JonF writes:
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slevesque writes:
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And yet andromeda is 2,5 million light years away from us, and it is coming towards us
Andromeda's our next door neighbor, just a stone's throw away. To see the effects of spatial expansion you need to look at things that are far away.
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Andromeda is also part of the Local Group.
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Anyone so limited that they can only spell a word one way is severely handicapped!
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