Why do tides form on opposite sides of Earth?
Quick Answer
Tides form on both sides because the Moon’s gravity pulls more strongly on the near side than the far side, while Earth and Moon orbit a common center of mass. That creates a bulge toward the Moon and another on the opposite side.
The Full Story
The Moon’s gravitational pull is slightly stronger on the side of Earth facing it and slightly weaker on the far side. Because Earth and Moon revolve around their shared barycenter, water is redistributed into two tidal bulges rather than one. As Earth rotates through these bulges, most coastlines experience roughly two high tides and two low tides each day. The Sun also contributes tides, but the Moon is the main driver because it is much closer.
Key Facts
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