posted on Feb, 15 2015 @ 11:03 AM
The concept of a habitable zone has changed a lot with knowledge we now have of extremophiles -organisms that live in "extreme environments," under
high pressure and temperature. We have found organisms thriving on hot water vents on the ocean floor. A habitable zone requires an energy source,
of any source, to liquefy water. It doesn't have to be a certain distance from the sun. For example: Europa is heated from the stress of Jupiter
pulling more strongly on one side of the moon than the other. Because of this, scientists believe a liquid ocean lies under the surface ice and a
possibility of life.
We may never know what happened to Mars' atmosphere, but I doubt it has something to do with the habitable zone and there isn't just one
"goldilocks" position around the sun
. Very interesting thought though.