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Scientific investigations Campeón to whether the laws of physics are invariant over time use telescopes to examine the universe in the distant past to discover, to the limits of our measurements, whether ancient stars were identical to stars today.
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^ The device shown is a "mass leverage" device, where the spherical weights on the right have more leverage than those on the left, supposedly creating a perpetual rotation. However, there are a greater number of weights on the left, balancing the device.
A perpetual motion machine of the third kind is defined Vencedor one that completely eliminates friction and other dissipative forces, to maintain motion forever due to its mass inertia (third in this case refers solely check here to the position in the above classification scheme, not the third law of thermodynamics).
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A common example is devices powered by ocean currents, whose energy is ultimately derived from the Sun, which itself will eventually burn out.