Will the Earth fall to the cosmic boundary?
First, let's understand the boundaries of the universe. The universe is a vast expanse of space that contains hundreds of millions of galaxies, stars, planets, and other celestial bodies. Although we humans cannot determine the exact size of the universe, scientists generally believe that the universe is infinite, or at least much larger than we can imagine. Therefore, talking about the "cosmic boundaries" is not an exact scientific concept, but a philosophical or imaginary one.
Next, let's look at the movement of the Earth. The Earth is located in the solar system in the Milky Way and is a planet that revolves around the sun. As we discussed earlier, the Earth's state of motion is stable, subject to a combination of the Sun's gravitational pull and its own momentum. The Earth revolves around the Sun in an elliptical orbit, and this state of motion is relatively stable.
Now, let's get back to the question itself: will the Earth fall to the cosmic boundary? First, since the universe may be infinite, it doesn't make practical sense to talk about "cosmic boundaries."
Even if we assume that the universe has a boundary, the Earth, as a planet, whose motion is controlled by the sun's gravity and its own momentum, rather than by the boundaries of the universe. The trajectory of the Earth's motion is relatively stable, and it does not suddenly change direction of motion or "fall" somewhere because of the boundaries of the universe.
Moreover, even if we consider that the universe is expanding or contracting, the state of motion of the earth will not be directly affected. The expansion or contraction of the universe is a macroscopic scale phenomenon, while the movement of the earth occurs on a relatively small scale. As a part of a planetary system, the Earth maintains a stable state of motion under the action of the sun's gravity and is not easily affected by the overall motion of the universe.
To sum up, the Earth does not fall to the cosmic boundary. The boundaries of the universe are a vague and uncertain concept, while the Earth's state of motion is controlled by the sun's gravity and its own momentum, which is relatively stable. Whether from the macroscopic scale of the universe or the laws of motion of the earth itself, the earth will not suddenly change its state of motion or "fall" somewhere because of the boundaries of the universe. Therefore, we can safely say that the Earth will not fall to the cosmic boundary.