Because the Moon is orbiting in the same direction as the Earth rotates, it takes extra time for any point on our planet to rotate and reach exactly below the Moon. Earth’s tidal bulges don’t line up exactly with the Moon’s position.From our view on Earth, these tides coincide with certain lunar phases since they occur when the Moon reaches specific positions in its orbit. When the Sun is at a right angle to the Moon, moderate tides, called neap tides, result. Twice a month, when the Earth, Sun, and Moon line up, their gravitational power combines to make exceptionally high tides, called spring tides, as well as very low tides where the water has been displaced.The timing and heights of the tide near you will be affected by those additional elements. Of course, in reality the Earth isn’t a smooth ball, so tides are also affected by the presence of continents, the shape of the Earth, the depth of the ocean in different locations, and more. Our observer sees the tides rise when passing through the bulges, and fall when passing through the low points. The toilets on the International Space Station are designed to look and feel as similar to those on Earth as possible. NASA had to use air flow to direct urine and feces.
NO GRAVITY NASA FULL
Rising and ebbing tides happen as Earth’s landmasses rotate through the tidal bulges created by the Moon’s gravitational pull. Since there is no gravity to either hold a toilet bowl full of water in place or pull human wastes down, designing a toilet for zero-gravity was no easy task.The Moon’s gravitational pull on Earth, combined with other, tangential forces, causes Earth’s water to be redistributed, ultimately creating bulges of water on the side closest to the Moon and the side farthest from the Moon.The low points are where low tides occur. On Earth, the Moon’s gravitational pull causes the oceans to bulge out on both the side closest to the Moon and the side farthest from the Moon. The Moon and Earth exert a gravitational pull on each other.See Tides article where these animations are used. These animations help to explain the science behind how the Moon affects the tides on Earth. Astronauts orbiting the Earth in a space station experience zero gravity or weightlessness because their spacecraft continuously undergoes changes in velocity.
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