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Why is Uranus colder than Neptune?

Hardy Newman believes that small heavenly bodies like planets also contain a small amount of rich-neutron matter at their cores and there exist some forms of back-and-forth conversion of rich-neutron matter/poor-neutron matter at the cores of the planets. These forms of matter conversion are sources of geothermal energy and the temperature of a planet is defined by not only solar energy, but also its own geothermal energy.

According to different sources from Wikipedia, Uranus and Neptune are of the same size. Neptune's axial tilt is 28^o and Uranus's axial tilt is 98^o which is also equivalent to 82^o axial tilt if it is looked upside down. The average distance from Uranus to the Sun is about 3 billion km and the average distance from Neptune to the Sun is about 4.5 billion km, which is one and half times farther from the Sun than that of Uranus. Despite Uranus is closer to the Sun than Neptune which means that Uranus receives more solar energy than Neptune, Uranus is, in fact, colder than Neptune. This mystery has been explained by Hardy Newman, a Vietnamese physics theorist, by adopting his theory of repulsion field as follow:

Hardy Newman believes that the axial tilt of a planet affects how fast the back-and-forth conversion of rich-neutron matter/poor-neutron matter, which takes place at its core, is. The internal conversion rate of matter, in turn, affects the amount of geothermal energy that the planet produces, and finally, affects its temperature.

Similar to a binary star system, rich-neutron matter at the core of a planet, even though it exists in a small amount, is repelled away from the Sun to the night side of the planet. This small amount of rich-neutron matter does not spin together with the poor-neutron matter around the axis of the planet, and therefore, the rich-neutron matter acts like a stationary mountain of rich-neutron matter in moving wind of poor-neutron matter in the surroundings. The pressure on the windward side of this mountain of rich-neutron matter is higher and that facilitates the production of rich-neutron matter. Meanwhile, the pressure on the leeward side of the mountain of rich-neutron matter is lower and that facilitates the conversion from rich-neutron matter to poor-neutron matter which produces geothermal energy.

Of the same angular speed of a planet, the speed of wind of poor-neutron matter in the surroundings of the rich-neutron matter mountain is fastest if the axial tilt is 0^o. In this case, the internal conversion of matter takes place at fastest speed, and therefore, the production rate of geothermal energy peaks.

The reverse also holds true. The speed of wind of poor-neutron matter in the surroundings of the rich-neutron matter mountain is zero if the axial tilt is 90^o. In this case, the internal conversion of matter does not take place, and therefore, the production of geothermal energy stops.

Obviously, the axial tilt affects the rate of geothermal energy production of a planet by affecting the conversion rate of matter at the core of the planet. That answers the question why Uranus is colder than Neptune.

Hardy Newman also believes that if the axial tilt of the Earth was 90^o, the Earth would be colder for the similar reasons to why Uranus is colder than Neptune.

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