Re: What an album. Thanks.
There are a lot of theories about how they are formed, it's hard to say for sure which one is right. The Mars Polar Lander was going to land in an area covered with spiders, so we missed our chance of knowing what they are. If you want a CD of all the known spider photos (full gifs not just portions) email me your address and I'll send you one. There are about 600 MB of photos on it.