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Originally posted by _BLiND_
Mars itself is kind of an orangy / red colour no? What if along time ago it was inhabited, now basically the planet was so overly developed with metals and technology it bascially looked like the deathstar from starwars.
a) the gravity isn't strong enough to hold a good atmosphere
b) the water evaporated long ago
c) there's no evidence it was ever anything other than a planet
d) there's WAY too much rust and it's too evenly distributed.
e) it's similar in composition to the other rocky planets in the solar system
f) it takes more than iron to make a civilization. You also need other metals, hydrocarbons, sillicas, radioactive material (Mars isn't radioactive), etc, etc.
g) the color goes all the way down. Not just one surface layer that blows around.
h) that doesn't explain the rocks (sandstones, apparently.) Metal ores are different than sandstones.
If that race died of a crazy plague or something. The tech would deteriate, and corrode, leaving the planet orange and red from the metals bein oxidized...so it's not dirt...but rust particles?
Well, if they were stuck in an iron age where they just HAD to have everything made of metal. However, metal isn't the best building material.
As tech developed, we moved out of the Iron age and into the Plastic Age. Very little is made out of pure metals these days. Ceramic and plastic and other similar materials are preferable because they're lighter and often stronger. The problem with iron is that it rusts and wears out.
I'm glossing over this; sorry I'm not going into details. Kind of in a rush today and hope that some of our other science experts will add onto this and give you better detail on planet formation, rock formation, observed formations on Mars, etc.
Evidence is mounting that the time-weathered red planet was once a warm and water-rich world. And a Mars awash with water gives rise to that globe possibly being fit for habitation in its past – and perhaps a distant dwelling for life today.
As sensor-laden orbiters circle the planet, NASA’s twin Mars rovers -- Spirit and Opportunity -- have been tooling about and carrying out exhaustive ground studies for nearly a year.
The Opportunity robot at Meridiani Planum, for instance, has found telltale signs that water came and went repeatedly within that stretch of Martian real estate. While that intermittent water at Meridiani Planum is thought to be highly acidic and salty, its ability to sustain life for some period of time cannot be ruled out.
Originally posted by Mephorium
Does Jupiter protect Mars from space debris as it does Earth?