Re: Planets

Actually, the first exo-solar planets discovered were around pulsars
(neutron stars).  PSR B1257+12 is believed to have three planets, the
first was discovered in 1991.  

Distance (au's):  0.19	 0.36	0.47
Period (days):	25.34	66.54	98.22
Mass (Earth = 1):   0.019   4.3   3.6
Orbital Eccentricity:	0.0   0.018   0.026

There have been several other discoveries of planets around pulsars, but
one was disproven.  What the thought was a planet was actually the
interaction of the emissions from the pulsar and our sun.

As for gas giants in bio-zones, just wait tell the sun turns into a red
giant, because Saturn's moon Titan could be habitable...  

ias