If the universe is expanding... does this mean the Earth
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If the universe is expanding... does this mean the Earth

[From: ] [author: ] [Date: 12-04-09] [Hit: ]
stars, and planets. Currently gravity is strong enough of a force to hold such objects together, keeping them from expanding and flying apart. At very large scales gravity has less influence which is why galactic clusters can spread apart.-The Earth has its own disconnected,......
If the Universe is always expanding is this fair to say the Earth is always expanding as well? if so could you elaborate on your answer. Thank you!

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As of right now, only the space between galactic clusters is expanding, not the space between galaxies, stars, and planets. Currently gravity is strong enough of a force to hold such objects together, keeping them from expanding and flying apart. At very large scales gravity has less influence which is why galactic clusters can spread apart.

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The Earth has its own disconnected, independent mode of expansion. However if you mean that the Earth is expanding due to being involved in the expansion of universal space and time, then no... If it did expand in this mode, this would imply that humans are also expanding and also their modes of perception would be expanding too.
In other words all of the universe' matter, energy, space, and time would be in a co-dependent mode of expansion. In this case everything would look "normal" and no relative expansion woulf be noticeable - and indeed, not even exist.!

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No. The expansion of the universe happens in areas gravity has little influence(the vast empty spaces between galaxies). Within galaxies and solar systems there is enough gravity available to combat this expansion and hold that portion of space steady in regards to its size.

This is a bit simplified version of the total answer, but the complete answer would require a great deal of mathematics and pages of explanation.

When it's said the universe is expanding what is meant is that the fabric of space itself between galaxies is expanding.

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No, it is not. The space between objects not bound by gravity is expanding, as is the overall size.

Think of a balloon that is partially blown up, then placed in an area with lower pressure, which causes the balloon to expand. The individual molecules inside the balloon do not change in size, but the space between them does, as does the overall size of the balloon.
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