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you know how in the years of Ancient greece and stuff and how they thought the earth was flat? well didnt they also believe that the planets and the sun revolved around the earth? is it reasonable to believe that planets and the sun can revolve around a flat object? your thoughts please

2007-06-08 09:43:47 · 16 answers · asked by shotgunmerc 4 in Science & Mathematics Astronomy & Space

16 answers

Anything can orbit another object requardless of the object's shape. Its the mass that matters.

Its worth adding that an ojbject with enough mass/gravity to have something as massive as a planetet orbit it would have to be a sphere. Such a large gravitational field would curve the edges of the object inward. Thats why all massive bodys in space are nearly spherical.

2007-06-08 09:48:45 · answer #1 · answered by kennyk 4 · 0 0

The ancient, learned Greeks knew the earth was spherical and why we believe that the ancients believed the earth was flat is probably more apocryphal than true. Compare this belief to the various mythologies of the past.
The idea of the moon, planets, sun, and the stars revolving around the earth persisted for hundreds of years under the Ptolemaic system of deferents and epicycles. It wasn't until 1543 that Copernicus finally proved the much simpler sun-centred system.
The ancients were not stupid by any means and because the moon clearly revolves around the earth, wouldn't you believe that everything revolved around us? I know I would.

2007-06-08 19:54:06 · answer #2 · answered by styx 2 · 0 0

Actually, the ancient Greeks knew the earth was round. But that's besides the point--the point is, yes, any object with mass causes other objects to be gravitationally attracted to it. Thus, it would be possible for the planets and sun to revolve around a flat object of suitable mass.

However, it's unlikely that this situation would occur, because any flat object of a size suitable to cause the planets and sun to revolve around it would collapse into a sphere due to its own gravitational forces. But assuming you had a flat object that was massive enough, sure, it could happen.

2007-06-08 16:51:20 · answer #3 · answered by Anonymous · 3 0

Not knowing what we know now, it may have seemed reasonable. But if they thought the Earth was flat, they weren't really putting much thought into the question of orbital mechanics to begin with.

Lots of ancient cultures knew that the Earth was a sphere. You can see it yourself twice a year, during a lunar eclipse. The Moon passes through the shadow of the Earth cast by the Sun - and the shadow is always a circle, no matter where you are on Earth.

2007-06-08 16:50:57 · answer #4 · answered by eri 7 · 0 0

To answer your question backward it would not be illogical to believe sun orbited the earth regardless it's shape. As the size of the sun started to be comprehended then it started to become illogical that it circled the Earth. By Ancient Greece there were groups that believed Earth was round. One scientist , who's name can't remember proved it. All thinking people that watched ship sail off and saw it's masks disappear last must have questioned flat gospel. Just some thoughts.

2007-06-08 19:18:05 · answer #5 · answered by Mister2-15-2 7 · 0 0

Newton's gravitational equation: f = (m1*m2)/d^2
shows that the force between two objects is equal to the mass
of one object times the mass of the other divided by the distance between them squared.

In other words mass is what attracts mass - not the shape of the mass. Orbiting objects must have mass.

http://www.creationscience.com/onlinebook/Asteroids.html

Check this link out. The asteroid, Ida, is far from spherical yet it has a tiny rock as its orbiting moon!

http://www.iep.utm.edu/t/thales.htm#SH6b

As for the ancient Greeks click on this link and scroll down to
"b. Thales's Spherical Earth" and read the four paragraphs.

Some Greeks had several reasons to believe the earth was spherical, but some thought it was flat.

As for planets orbiting the sun, they thought they orbited the earth and that the earth was the center of the universe.

2007-06-08 17:41:20 · answer #6 · answered by jimschem 4 · 0 0

I don't think the ancient greeks thought the earth was flat. They just thought that the sun and other planets revolved around the earth.

I think flat earth is a Christian belief based off a line from the Bible.

2007-06-08 16:52:22 · answer #7 · answered by the_hilton 4 · 4 0

The ancient Greeks did not think the world was flat. They thought it was round. All educated people have known the world is round for thousands of years. The idea is not new at all. It is really kind of obvious, and was even back then, since there is no edge that any traveler has ever found and since the ocean would quickly drain away over the edge if the Earth were flat.

2007-06-08 17:02:23 · answer #8 · answered by campbelp2002 7 · 2 0

You have done no study of the great minds of ancient Greece.

Even back then, there was sufficient proof that the world was round, the Moon was round. Heraclides (330 B.C.) developed the first Solar System model, the beginnings of the geocentric (Earth-centered) theory. Aristarchus of Samos was another ancient Greek astronomer and one of the first to propose a heliocentric (Sun-centered) theory of the universe (circa 270 BC). So the debate was on and continued until Ptolemy rewrote an elegant description of a geocentric universe about 140 AD.

The Christian (Catholic) church adopted Ptolemy's writing as the "last word" on celestial structure, and enforced its creedence until Nicolaus Copernicus began re-introducing heliocentrism in 1514. Talk about "Dark Ages".

Fearing reprisal by the church, Copernicus delayed publishing copy of his extensive proof until he was on his death-bed in 1543.

But the ancient Greeks and other scientists of the day were much smarter than you give credit for. A flat Earth notion was a pagan concept and a misconception of the uneducated in the Middle Ages and Rennaisance.

To your other question, it isn't normal for gravitational accretion to support flat shapes. For purposes of brevity, it is sufficient to say that planets are generally spherical because all but the extreme forces of gravity and rotation will shape them that way.

2007-06-08 17:17:54 · answer #9 · answered by Anonymous · 1 0

the intelligent people of that day knew that the earth was a sphere - there is no such thing as a flat object -all things have 3 dimensions - a lot of people believed that all objects revolved around the earth ;but people also belived that white light was God's pure light - iassac newton was
ostracized by the church for proving via the prism that white light is the summation of all visible light be it red thru violet

2007-06-08 16:54:16 · answer #10 · answered by 55john64 1 · 0 0

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