Gravity is a force of nature that has intrigued humanity for centuries.
With the help of modern-day physics, we have revealed more of gravity's effects, some of which may come as a great surprise. For instance, gravity not only keeps our feet firmly planted on the ground, but shapes our perception of time and causes the ebb and flow of the tides. This rhythmic movement of the oceans results from Earth's own gravitational pull, as well as that of its neighboring planets. For this reason, we observe daily tide levels that fluctuate between extreme high and low every six hours. If the sun and moon happen to be in alignment with the Earth on a particular day, these high tides will be at their peak.