Earth is a planet, Spherical in shape; its surface appears to be flat and has no edge. It’s a perfect sphere by a centric force; its equatorial diameter is approximately 12,756 kilometres, while the polar diameter is roughly 12,714 kilometres. This difference of about 43 kilometres is much greater than the height of the mountains and the depths of the ocean trenches. To prove this scientifically, you just need to travel and observe how the sky changes, celestial navigation works. If you are in the northern hemisphere, when you travel north or south, the angle the line of sight to the pole Star makes with the level changes; when you travel east or west, it stays the same. As you approach the equator, you can look north and watch the stars rise in the east and set in the west, circling the pole star counterclockwise. You can look into the south and see the stars rise in the east and set in the west, circling the south celestial pole in a clockwise direction. There is no star in the southern hemisphere exactly where the Earth’s axis of rotation points. The Earth has only one edge, the surface. It doesn’t have edges in the horizontal direction. At the upper edge of the earth, we find the atmosphere. This layer of gases, held close to the earth by the influence of gravity, is touch everywhere we look. The density of these gases decreases as an exponential function of altitude above the Earth’s surface. This decrease is very rapid at first, with the rate of change dominated by the ambient pressure change, which is itself an exponential decrease as a function of altitude. Charged particles called the solar wind fly off our sun, or for that matter, any star. So one way to define the edge of our solar system is to look for where our solar wind contacts the solar wind from other stars. That’s a somewhat porous membrane, but the collisions between our solar wind and everyone else’s from a bubble of hydrogen around the sun. Anything in the bubble is part of our solar system, and if it isn’t, it isn't. Very difficult to see the edge, that doesn’t exist, definitely not possible, but at least very difficult to prove you have seen it. There are lots of proofs for roundness. 1. Photos from space. 2. Detailed mapping of all continents, seas, and the distances. 3. Time zones and the movement of the sun over the sky in different places all over the world, 4. Shadows from the earth, when we have a lunar eclipse. 5. Coriolis force and how this makes cyclones spin in one direction north of the equator and the opposite direction south of the equator. Coriolis force also explains the
dominating directions of use currents.
We cannot distinguish the Sharp edges because of the visionary constraints and the earth being a solid, round shaped spherical object. We would always view similar pictures from any angle and point of observation from the surface, the portion is the highest and the bulgiest top of the positioning. Nevertheless, the edges of the earth exist. Earth’s landscape
is distinctly different from the other on the face of it. As we don’t have exact knowledge about the boundaries of our universe, we are not sure, but we can go with the most satisfying theory Hubble law. Our universe is expanding, expanding with the help of energy generated during the Big Bang explosion. This is known as the Hubble law, named after Edwin Hubble.
The inner core changed the shape of the Earth.
The inner core of the Earth has changed shape in the past 20 years, according to a group of scientists.
The inner core is usually a ball-shaped structure, but its edges may actually have deformed by 100m or more in height in places, according to prof John Vidal, who led the research.
Earth’s core is the beating heart of our planet as it produces a magnetic field that protects life from burning up in the sun’s radiation. The inner core spins independently from the liquid outer core and from the rest of the planet. Without this motion, Earth would die and become more like barren Mars, which lost its magnetic field billions of years ago. The change in shape could be happening where the edge of the inner core touches the extremely hot Liquid Metal outer core.
The inside of our planet is a mysterious space; the core is about 4,000 miles from the Earth’s surface, and, despite best efforts, scientists have so far been unable to reach it.
The new analysis looked at seismic wave patterns from earthquakes that repeated in the same location between 1991 and 2023. That helped to show how the inner core is changing over time.
Prof Vidale, an earth scientist at the University of Southern California, found more evidence to back up the theory that during those years the inner core slowed down around 2010. But this team also found evidence of the inner core’s changing shape. It appears to be happening at the boundary of the inner and outer core, where the inner
core is close to the melting point, the liquid flow of the outer core, as pulled by an uneven gravity field, may cause deformation. The changes may be connected to changes in Earth’s magnetic field. The magnetic field has experienced fluctuations at various times over the past few decades, and we’d like to know if this is related to what we’re seeing at the inner core boundary. Prod Vidale has urged caution about hyping the findings into ideas that the core is going to stop rotating any time soon.:
Now, all of this is not to say the earth doesn’t have an edge. A marble or a basketball has an edge called the surface. It’s a conglomeration of all the possible points that are
approximately equidistant from the centre of the Earth, deep inside, passed through the molten outer core to the centre of the iron inner core.
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