How+would+the+Earth's+seasons+be+affected+if+the+Earth's+axis+wasn't+tilted?

=**__My inquiry question, how would the Earth's seasons be affected if the Earth's axis wasn't tilted?__**= Several theories on what would happen. One theory is that the moon never would have formed and life could never have sprouted because most scientists believe that a huge asteriod crashed into Earth and knocked the Earth into it's axis and formed the moon. If the asteriod never crashed into the Earth (not tilting the axis) the moon would have never formed and our axis, without the help of the moon to stablize it, would be all over the place, and this new axis which is all over the place wouldn't have the right condictions to grow life. Which needs the axis to stablize or the sun's rays might produce all out drought. And if there wasn't a moon, asteroids and comets would bombard the Earth making it impossible to sustain life. (Have you thanked your natural satellite lately?) [] A moonless Earth.

Another theory is the theory that the Earth can sustain life without the moon but the seasons would never change. The middle part of the Earth would be completely desert area because the sun would always point in that direction and the season would always be summer. And the north and south poles would be completely ice and winter. The top middle and the bottom areas would become tropics and be the most habital place on this newly formed Earth, these seasons would be either spring or fall. Though the tropics would be small and cooler or hotter on some days on the spin of the tilt. [] As you can see our surface would be similar to Mars and the tropical areas are tiny compared to the desert and polar regions.

The second last theory is the theory of a completely waterless Earth. The world would be completely lifeless because the water evaporated and would have traveled everyday to the cool side of the Earth. And finally divide into two elements, Hydrogen and Oxygen. Then the gases would float away and end up floating into endless space. And life would have never grown. The Sun would poison the Earth with radiation and burn every living thing if life even started.

The last and final theory for my question is that the Earth would be a complete barren wasteland and with no water, no atmosphere and no life. As unreliable as these theories may be, there is a glimmer of truth in this fairytale. From what we know, our planet could have turned out like a brother to Mars. But dispite the odds, our planet created life, and from that, it created us. And if our planet wasn't tilted, we would have some life and our seasons never ending, or we could have no life at all and be a bare planet, but, no one knows for certain, for our planet has a tilt of 23.5 degrees and we may never know.