Earth is warming.
Mars is warming.
According to R. Hoagland, the whole solar system is warming.
What is the cause of this strange phenomena?

Is it hyperdimensional energy?
If "hyper" is that which cannot be seen or detected and is synonymous with another dimension then what we see is not hyper, its called astrology or astrologic alignments. The real hyperdimension is 4D-gravity. If you want to explore the nature of gravity, see 25 Gravity

Is it warm space we are traversing? No, space is a few degrees above absolute zero.

Is it the alignment of planets called astrology? No, although these alignments might induce their astrologic influence as documented by all of history's study of astrology, it has never, ever documented nor forwarded that astrologic alignments warm planets, has it? No.

So back to the single question: What is causing the whole solar system to warm up?

The answer is quite simple and I saw it a long time ago as I have posted several times , out of the intuitive goodness of my hyperdimensional-4D-gravity-centered-heart, so you could see it.

The answer is:

Turn on a lightbulb.
Put your finger two inches away from the lightbulb.
Can you feel the heat?
Move your finger to within one inch of the lightbulb.
Do you feel more heat?
Now touch the light bulb with the tip of your finger.
Was your finger ejected away from the light bulb?

The planets are analogous to your finger moving closer and closer to the lightbulb. Your ejected finger is analogous to Mercury in the future. Simply put, the planets of our solar system are ingressing toward the Sun and each planet, in its turn, will be ejected outward called egression. As they all ingress, of course they get warmer. This is a phenomena of The Natural Theory of Planetary Ingression and Egression.