Has Mars ever reflected Earth? I would like to begin this discussion by defining the term "mirror" as a similarity or characteristic of a mirror image. So for the propositions in this discussion I will use this definition, meaning they are a resemblance and not a direct copy of each other. Now that all the formalities are out of the way, let's move on. After spending a small portion of my life reading about the geology of Mars, I have come to the conclusion that Mars does in fact have evidence to support that it was once a mirror planet of Earth. Or better yet, Earth is a present-day mirror image of Mars in the past. In the paragraphs below, I will support this claim with evidence from research findings, articles and photographs. It will also be structured as follows: interior, magnetic field, atmosphere, plate tectonics, volcanoes and water. Mars has an interior very similar to Earth's interior. Mars has a core, a mantle and a crust, just like Earth. They are both made primarily of iron and behave quite similarly. Mars has a much smaller interior than Earth, but that makes sense when you take into account that Mars is almost half the size of Earth. The Earth's core is made up of two parts: a solid inner core and a liquid outer core. Radioactive decay in the core generates heat. This heat is lost from the core to the upper layers. Convective currents in the liquid outer core along with the Earth's rotation produce the Earth's magnetic field. This is where Earth and Mars begin to differentiate. The outer part of Mars' core may be molten, but this is unlikely because Mars has only a weak magnetic field (less than 0.01% of Earth's magnetic field). Although Mars does not currently have a strong magnetic field, it could have had a middle of paper......ideal for supporting liquid water and with the abundance of evidence, I think this is It makes sense that Earth reflects the past form of the Martian planet. Since Mars and Earth had very similar geology, I believe these two planets actually mirror each other as previously defined. They both share a magnetic field, a thick, rich atmosphere, volcanoes, plate tectonics, liquid water, and share similar interiors. The planets' orbits are in the habitable zone and Mars' post-formation conditions would also have allowed it to be a primitive Earth. I hope this discussion has been informative and interesting to read. Please comment below if you have any questions, comments or concerns. My thanks also go to NASA and others for the webinars, slides, and information on these topics that allowed me to write in the first place..