Why is Earth tilted at exactly 23.5 degrees?It is a permanent scar from a 4.5 billion yr old collision. A Mars-sized planet named Theia slammed into Earth. The impact was so violent it knocked Earth off its vertical axis & blasted enough debris into space to form the Moon.W/o the Moon acting as a gravitational anchor, Earth’s tilt would wobble wildly from 0 to 85 degrees.If we did not have that 23.5 degrees tilt locked in by the Moon, the seasons would be chaotic. 1 year the poles would melt com

Study Confirms Climate Models are Getting Future Warming Projections Right - NASA Science

Climate Change - NASA Science