It's very very big. Frighteningly (or excitingly) so. We covered it in this post (and that was only the 400 thousand galaxies next to ours - out of the 100 BILLION galaxies in the known Universe).
Let's dial it back a notch. Let's see the distances involved in the Solar System, shall we? This amazing infography shows the distances that we are talking about.
|Relevant, and I had to include it. Best. Headline. Evah.|
For me, the most amazing part is that Voyager I is 18 billion kilometres away! That is absolutely amazing. And yet, it's so, so small compared to the vastness of the Universe (only 11 light-hours from us, compared to 100 light-YEARS of the Galaxy alone).