Also, what would happen to the Earth’s tides if there were no moon? These are questions that are covered in this blog post about tides.
The Earth’s tides are results of the gravitational pull from the Sun and the Moon on Earth’s water. For starters, gravity plays an important role with both the Sun and the Moon’s tidal forces. Since the strength of gravity decreases with distance, the gravitational attraction decreases as you go from the side of the Earth facing the Moon to the side facing away from it. There are two tidal bulges as a result as the tidal force or “stretching force,” and these include one that faces the moon and one that is the opposite of the moon.
When comparing the tidal effect of the Sun to the tidal effect of the Moon, a misconception is that the Sun’s tidal force is drastically greater than the Moon’s tidal force on Earth. One may assume this is true because the Sun is more than a million times bigger in mass than the moon. However, this person would not be taking into account the fact that distance is also a factor for the strength of the tidal force. Because the sun is much farther away to Earth than the Moon, the Sun’s pull on the sides of Earth is actually small.
If there were no Moon, there would be a significant change in Earth’s tides. Scientists have estimated that without the moon, tides on Earth would be one-third of their current size. Moreover, low tides would be lower and high tides would be higher. I think that it is fascinating that the Moon plays such a significant role in our tides!