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When a log has been floating for a long time it probably absorbs so much water that it begins to lose its ability to float.

When it reaches this point does it immediately sink to the bottom...

Please explain how a siphon works?

I don't think everything was as neat and orderly as we imagine it to have been when all the loose material began to coalesce. There could have been outside forces still at work affecting the...

Are all stars locked into galaxies or are there loose stars moving through space free to travel wherever they are heading?

I have forgotten how scientists measure the distance to stars by studying nearby varible stars. Please explain.