Full Text:
http://www.sciencemag.org/cgi/content/full/297/5581/523?ijkey=xGB7U7wDbeXl2&keytype=ref&siteid=sci
The second paper appeared in PASP (2003), also
with father-son team Martin & Alex Harwit. You can access
this paper here. This
goes through the arguments in the Science paper in more detail.
NASA has since announced that they will place a laser transmitter
(0.3m diameter, 5W mean power) around Mars
in 2009 beamed back to Earth. Following discussions with NASA in
Sydney during the International Astronomical
Union (July 2003), the Anglo-Australian Observatory is to take an active
part in this development, to be ratified at
meetings in Washington DC in early 2004. We have much to contribute
to this project -- for more details, see our
web site.