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Gravity is not an unproven theory. First of all, in science a theory is not an unproven conjecture (that would be a hypothesis) but is an explanation of some aspect of the natural world that is based on observations which have been verified repeatedly through experimentation.
That gravity is a real phenomenon is indisputable. What is at question is exactly how gravity works. Is it a force carried by a so far hypothetical elementary particle called a gravition, or is it the curvature of space as Einstein said? But that there is a thing which we call gravity is confirmed by the fact that everything falls down, not up.
Things that float do so because they are lighter than air. The helium in a balloon is lighter than the general gaseous makeup of our atmosphere. Planes fly because the shape of the wing as it flies though the air causes there to be less pressure above the wing than below it.
The Sun exerts gravity. But so does the Earth. There is a balance point between the two. The Earth's gravity is sufficient to keep the moon in orbit around it.
No, and no. Gravity prevents a plane from flying out into space. In order to escape the gravitational pull of the earth escape velocity has to be reached. The escape velocity from the ground is roughly 25,000 miles per hour.
They aren't perfectly level. Not even close. Because of differences in the Earth's mass, the pull of gravity varies to some extent and this causes differences in the ocean levels. I'm not referring to low and high tides, but to the fact that there are bulges and dips in the oceans. The surface of the ocean is not flat. Also, changes in air pressure as air moves from high to low pressure areas has an effect on ocean surface levels.
Quote:
Originally Posted by USMC1984
^^^^ You DO realize that no one has ever been able to duplicate the whole gravity thing holding something in it's orbit? Also, every example you think you explained is severely flawed because gravity would have to be extremely selective.
Actually it's been duplicated every time a satellite has been put into orbit around the Earth. It's observable every time you look at the moon or at the planets, or at the moons that are in orbit around those planets. And no, none of the examples which I did in fact explain is flawed. Everything I stated is testable and/or observable.
For instance, take the issue of things being able to float. Test it by taking two balloons and filling one with CO2 which heavier than air. Fill the other balloon with helium. The one filled with CO2 will sink because it's heavier than air. The balloon filled with helium will rise into the air because it is lighter than air.
That the escape velocity to escape Earth's gravity is around 25,000 mph has been proven over and over by the fact that space craft have had to reach that escape velocity to leave Earth's orbit and go into space.
Want to prove gravity for yourself. Jump into the air. What happens? You come back down.
We have very precise measuring devices capable of measuring the strength of Earth's gravity at different spots on the planet and we can measure the bulges and dips on the ocean surface.
I'm assuming you've never taken even basic science courses in school.
Last edited by Michael Way; 01-31-2018 at 03:42 PM..
I can't believe that there are people who believe that the Earth is flat. This is not even worth my time.
Its gotta be a distraction...... To take peoples minds off more important things happening.... I cant think of any other reason they all of a sudden since last year are believing this!!
I'm more comfortable with somebody who questions everything voting than somebody who votes a straight party ticket.
Questioning things is fine. It's great in fact. That's how science works. What is not fine is not being willing to accept well established answers to those questions.
It's not fine to deny that man has been in space, has gone to the moon, is right now on the ISS in orbit around the earth.
It is not fine to deny that the Earth is a sphere when it is a very observable fact that it is.
It is not fine to deny that the Earth is very old, on the order of several billion years when it has been dated as such by various methods.
It is not fine, as one poster on this thread has done, to claim that gravity is an unprovable theory. To be so scientifically ignorant is really without excuse.
Its gotta be a distraction...... To take peoples minds off more important things happening.... I cant think of any other reason they all of a sudden since last year are believing this!!
I agree. Same thing with the moon landing deniers.
Actually it's been duplicated every time a satellite has been put into orbit around the Earth. It's observable every time you look at the moon or at the planets, or at the moons that are in orbit around those planets. And no, none of the examples which I did in fact explain is flawed. Everything I stated is testable and/or observable.
For instance, take the issue of things being able to float. Test it by taking two balloons and filling one with CO2 which heavier than air. Fill the other balloon with helium. The one filled with CO2 will sink because it's heavier than air. The balloon filled with helium will rise into the air because it is lighter than air.
That the escape velocity to escape Earth's gravity is around 25,000 mph has been proven over and over by the fact that space craft have had to reach that escape velocity to leave Earth's orbit and go into space.
Want to prove gravity for yourself. Jump into the air. What happens? You come back down.
We have very precise measuring devices capable of measuring the strength of Earth's gravity at different spots on the planet and we can measure the bulges and dips on the ocean surface.
I'm assuming you've never taken even basic science courses in school.
It's never been replicated...you are citing examples of density and buoyancy...not gravity....which ironically is what the flat Earth people use! You use their explanation but mis-apply it to gravity!
Please explain how gravity from the sun can hold Jupitor in orbit yet not suck the Earth into it? Very selective in it's pull don't you think?
^^^^ You DO realize that no one has ever been able to duplicate the whole gravity thing holding something in it's orbit? Also, every example you think you explained is severely flawed because gravity would have to be extremely selective.
Quote:
Originally Posted by Mike555
Actually it's been duplicated every time a satellite has been put into orbit around the Earth. It's observable every time you look at the moon or at the planets, or at the moons that are in orbit around those planets.
Quote:
Originally Posted by USMC1984
It's never been replicated...you are citing examples of density and buoyancy...not gravity....which ironically is what the flat Earth people use! You use their explanation but mis-apply it to gravity!
Please explain how gravity from the sun can hold Jupitor in orbit yet not suck the Earth into it? Very selective in it's pull don't you think?
Satellites in orbit around the Earth are in orbit because of a balance between the earth's gravity and the momentum of the satellite around the Earth. It has nothing to do with buoyancy and density.
All of the planets are in orbit around the Sun because each orbits at its specific distance from the Sun at its own specific rate of speed. In each case the balance between the Sun's gravity and the planet's rate of speed around the Sun maintains the planet's orbit around the Sun. Momentum and gravity are in a balanced tug-of-war.
Haven't you ever bothered to look any of this up?
Addendum: Here. If you don't believe me, then believe NASA.
How Do Satellites Orbit Earth?
''Most satellites are launched into space on rockets. A satellite orbits Earth when its speed is balanced by the pull of Earth's gravity. Without this balance, the satellite would fly in a straight line off into space or fall back to Earth. Satellites orbit Earth at different heights, different speeds and along different paths.''
Satellites in orbit around the Earth are in orbit because of a balance between the earth's gravity and the momentum of the satellite around the Earth. It has nothing to do with buoyancy and density.
All of the planets are in orbit around the Sun because each orbits at its specific distance from the Sun at its own specific rate of speed. In each case the balance between the Sun's gravity and the planet's rate of speed around the Sun maintains the planet's orbit around the Sun. Momentum and gravity are in a balanced tug-of-war.
Haven't you ever bothered to look any of this up?
Addendum: Here. If you don't believe me, then believe NASA.
How Do Satellites Orbit Earth?
''Most satellites are launched into space on rockets. A satellite orbits Earth when its speed is balanced by the pull of Earth's gravity. Without this balance, the satellite would fly in a straight line off into space or fall back to Earth. Satellites orbit Earth at different heights, different speeds and along different paths.''
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