What would happen if the Earth’s axis was not tilted?

If the Earth weren’t tilted on its axis, there would be no seasons. And humanity would suffer. When a Mars-size object collided with Earth 4.5 billion years ago, it knocked off a chunk that would become the moon. It also tilted Earth sideways a bit, so that our planet now orbits the sun on a slant.Click to see full answer. In this regard, what would happen if the Earth’s axis was straight?If the earth weren’t tilted, it would rotate like that as it revolved around the sun, and we wouldn’t have seasons—only areas that were colder (near the poles) and warmer (near the Equator). But the earth is tilted, and that’s why the seasons happen.Secondly, what would happen if the Earth was not tilted 23.5 but tilted at 40 degrees? The answer is really simple: If the Earth was not tilted, the sun angle would be the same year round, for example, at 45 °N the sun angle at noon would be 45 °, while the sun angle at midnight would be -45°. At 30 °N, the sun angle would be 60° at noon and -60° at midnight. In respect to this, what would happen if the Earth’s axis was tilted 90 degrees? The 23.5 degree tilt is responsible for the seasons. If the earth had no tilt there would not be seasons. If the earth was tilted by 90 degrees the seasonal changes would be at the most extreme. The Earth’s pole would point directly at the sun at a point on the track around the sun.What would happen if Earth’s axis of rotation were tilted at a greater angle?If the earth had an axis tilted at 45° degrees to its orbit of the sun the seasons would be more extreme but also mor polar centric. The sun would be closer to the northern or southern side of the sky depending on the season. Astronomy would not be so drastically different.