Suppose you have a spherical or circular ball and you drilled a hole from one side till it reaches the other side. The time taken to reach the opposite side of the ball from your current position covering its circumference will be more than the time taken if you jump into the hole which you drilled previously. See the image for understanding the above point. We knew that Earth is spherical in shape. So after understanding the above point a new question arises – “Can we dig a hole into the earth’s surface from one side to another side? And if we succeed how long will it take to reach the other side if we jump in it?” – Well, scientists have been thinking about this for nearly half a century and came up with the answer as 42 minutes and 12 seconds. However, this is practically impossible as the earth is surrounded by gravitational force, it has high density, air resistance and temperature at the center of the earth is close to 6000 degree Celsius (10,800 F). This concept of drill
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