<div dir="ltr"><div><div><div>> Seen galaxy collision simulations? Galaxies pass right through each
other. There is some dynamical friction, but it is very small compared
to the velocities between in-falling galaxies. You end up with two
scattered galaxies moving apart.<br><br></div>Two galaxies properly infested with the right kind of probes would collide much better than what we see in a natural collision. Stars would be decomposed to something much more suitable for a collision.<br>
<br>> Do you want the extra mass in order to reduce tidal forces at the horizon?<br><br></div>That also. But mainly as a mass/energy source for our toys.<br><br></div>P.S. This all may change a little, if we will be able to harness the dark matter also.<br>
<br>P.P.S. This all may change a lot, if we will be able to harness the dark energy also.<br><div><div><br><br><br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Dec 31, 2012 at 2:14 PM, Anders Sandberg <span dir="ltr"><<a href="mailto:anders@aleph.se" target="_blank">anders@aleph.se</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">On 2012-12-31 13:08, Tomaz Kristan wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
> We probably want to *stop* the galaxy as it arrives<br>
<br>
Don't worry! It will be stopped with the galaxy coming from the opposite<br>
direction.<br>
</blockquote>
<br></div>
Seen galaxy collision simulations? Galaxies pass right through each other. There is some dynamical friction, but it is very small compared to the velocities between in-falling galaxies. You end up with two scattered galaxies moving apart.<div class="im">
<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
In the case of the eternal inflation we should consider this very<br>
seriously. Building a hyper-massive black hole here.<br>
</blockquote>
<br></div>
Do you want the extra mass in order to reduce tidal forces at the horizon? It is not clear that extra mass is terribly useful when breeding baby universes.<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
-- <br>
Anders Sandberg<br>
Future of Humanity Institute<br>
Oxford University<br>
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