Re: Two questions

Zdenek Jizba wrote: 
   These questions are strictly hypothetical.

   Question 1.
      If the earth expanded at the same rate as the
universe, how much would the radius increase in 1
million years?


The Hubble parameter is about 72 km/s/Mpc, which is equal to
about 2.3 * 10^(-18) 1/s. H is the relative expansion rate,
i.e. Rdot/R. If we assumed this for the Earth, we get about
Rdot = 1.5 * 10^(-14) km/s (with R = 6380 km), i.e. in
1 million years, R would increase by about 0.47 km. Not that much...


   Question 2.
       Were all planets at the same distance from the
sun 100 million years ago as they are today?


I don't think so. There are various effects which could change
the orbital distances: interactions with the other planets, with
the interplanetar medium etc.

But I have no clue how big these effects are.


Bye,
Bjoern
.

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