What if Einstein is wrong about gravity?

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#61
Science is intrinsically a process building on that which came before. Theoretical physicists depend on observations made by others and on mathematicians who invent the numerical languages theories are expressed in. Maxwell was a giant but relativity was Einstein's magnum opus.
 
#65
TNT said:
Check the picture. The Moon (M) has a line in it - the end where it meets it surface is a fix point on the moon - you could stand there. Now, if the moon was to circle around Earth.. ooops it does 🙂 - what would you see of Earth as the moon takes a trip around Earth in the different M positions 1-5? This is all seen as per from the "above" i.e. looking down on E and M.

So you dont see E from pos 2 & 3 and barely from 4.

But imagine you would turn the moon so that that line in M was always pointing to the centre of E you would see E all the time. And that is what going on - M slowy rotates around its own axis to do just that. From E, it looks like M stands still i.e. not rotating. Hence, we never see the DSOM - call Pink Floyd if you don't believe it 😉

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So the issue I'm having is that if you place an object on a compass and spin it around, it's fixed and always faces the center. So is it rotating on a virtual axis? Is this a matter of geometrics?
 
#66
Skip compass - has noting to do with it.

Take an orange and a ping-pong ball. Make red mark on ping-pong ball. Place orange on table. Make pp ball go around orange. Observe the red mark on the pp ball.

Over & out you little jest-troll 😉

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#68
A compass reading has nothing to do with the movement in space of the earth or the moon.
The compass needle just aligns with the earth's static magnetic field.

If the earth stopped (either or both) rotating or revolving around the sun, or even went in reverse,
the compass needle's behavior would remain the same.
 
#69
Galu said:
Albert Einstein predicted the existence of gravitational waves in 1916 in his general theory of relativity.

The first proof of their existence didn't arrive until 1974, 20 years after his death.
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I thought the actual proof was just a couple years ago in that giant laser experiment. 74 had some observations in space that implied it.
 
#70
rayma said:
A compass reading has nothing to do with the movement in space of the earth or the moon.
The compass needle just aligns with the earth's static magnetic field.

If the earth stopped (either or both) rotating or revolving around the sun, or even went in reverse,
the compass needle's behavior would remain the same.
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But it is not static. It migrates. Details details details. As you say, it is generated by the dynamo effect of the core internally, not gravity.
 
#71
https://spaceplace.nasa.gov/gravitational-waves/en/
"In 2015, scientists detected gravitational waves for the very first time. They used a very sensitive instrument called LIGO (Laser Interferometer Gravitational-Wave Observatory). These first gravitational waves happened when two black holes crashed into one another. The collision happened 1.3 billion years ago. But, the ripples didn’t make it to Earth until 2015!"

Remember the AD 797 op amp used for the experiment?
 
#76
rayma said:
https://spaceplace.nasa.gov/gravitational-waves/en/
"In 2015, scientists detected gravitational waves for the very first time. They used a very sensitive instrument called LIGO (Laser Interferometer Gravitational-Wave Observatory). These first gravitational waves happened when two black holes crashed into one another. The collision happened 1.3 billion years ago. But, the ripples didn’t make it to Earth until 2015!"

Remember the AD 797 op amp used for the experiment?
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Sure there wasn't a wife in a kitchen involved? 🙂

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