An "Ask a scientist" question & answer on the subject of the Earth's shape....
(I reccomend u read this at the originating page...)
http://www.newton.dep.anl.gov/askasci/gen99/gen99427.htmname Ann
status student
age 14
Question - Can you give one undisputable answer to:
"Is the earth round, and how do we prove it."
Because we are having a debate in my class, and the teacher kept saying
'the earth is flat' And I have to give him one undisputable answer.
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I may be wrong about this, but I think your teacher is trying to
demonstrate to you that anything and everything is open to dispute. In
fact, a rather famous theorem in the philosophy of science, the Duhem-Quine
theorem, states that it is impossible to conclusively disprove any
scientific hypothesis. That includes such hypotheses as the earth is flat,
photography steals the soul of the object being photographed, and apples
are highly toxic to humans. To hold on to such hypotheses, it may be
necessary to put forth some rather farfetched explanations of what we can
observe, but it can always be done.
In fact, science does not work by conclusively and indisputably refuting
bad hypotheses. Instead, hypotheses stand or fail on their ability to
explain known observations, and to predict the outcome of observations that
haven't been performed yet. Let's take the flat earth versus round earth
hypotheses as an example. A round earth is the most stable shape according
to gravitational theory; a flat earth would tend to collapse toward the
center, and people standing near the edges would feel a gravitational pull
toward the center of the flat surface instead of perpendicular to the
surface. Your teacher could counter that gravitational theory is wrong;
magic holds us to the earth. This may be true, but it doesn't explain why
gravitational theory works so well at explaining how things fall, and the
observed trajectories of the planets and their moons. You could tell your
teacher that photographs of the earth from space show that it is round,
just like the globe model in your classroom. He could counter that those
photographs are government fakes. Perhaps so, but we can see that other
planets and moons are round; wouldn't it make more sense to say that the
earth is round, too? Your teacher could say that the earth is special and
different. You could ask how numerous people have sailed or flown around
the earth if the earth is flat. He would have to say that every one of
these people, separated as they are in time and space, belongs to the same
great conspiracy aimed at brainwashing us into supposing that the earth is
round. You could ask him about the communications networks that are linked
by satellite - how can you have satellites orbiting a flat earth? He might
then tell you that there really aren't any satellite links - everything is
connected by wires, or a close-packed array of relay antennas.
READ THE REST...
http://www.newton.dep.anl.gov/askasci/gen99/gen99427.htm