They haven't had time: the real reason why men from Mars don't call
Sydney Morning Herald, Jan. 18, 2007, [www.smh.com.au]

So much space, so little time: why aliens haven't found us yet
By Ian Sample, The Guardian, Jan. 18, 2007, [www.guardian.co.uk]

The paper discussed in this article is:

Bjoerk, R., 2007, Exploring the Galaxy using space probes.
Astrophysics, abstract astro-ph/0701238, [arxiv.org].

The PDF file can be downloaded from [arxiv.org].

Best Regards,

Paul H.

"The past is never dead. It's not even past."
William Faulkner, Act 1, Scene III, Requiem for a Nun (1951)