1. 1 Mercury day lasts 58.6 Earth days. Three Mercury days (1 day = 1 × 360° rotation on itself) are exactly as long as two Mercury years (1 year = 1 × 360° revolution around the Sun).

This is possible because Mercury's orbit is Very Not Round. When closest to the Sun (46M km), Mercury's distance from it is only 2/3 of its distance from the Sun when farthest from it (70M km).

2. 1 Venus day (243 Earth days) is longer than 1 Venus year (224.7 Earth days). Venus also rotates clockwise, contrary to the other planets. If one could see the Sun from Venus through the thick, opaque clouds of sulfuric acid, the Sun would rise in the west and set in the east. Slowly.

3. The tilt of Earth's axis (23.4°) is solely responsible for the change in seasons. When it is winter in the Northern Hemisphere, the Earth is also at its closest from the Sun. In fact, the Earth is closest to the Sun on January 3, and furthest on July 7.

3.5 The "dark side" of the Moon gets just as much light at the other side. It just cannot be observed from Earth. It also bears one of the largest impact craters known in the Solar System: South Pole–Aitken basin - Wikipedia

4. Mars has the highest volcano and the second highest mountain known in the Solar System, Olympus Mons. It is 21.9 km high. The highest mountain known in the Solar System is Rheasilvia, a 22.5 km high peak on the asteroid Vesta.

Mars has two potato-shaped moons, Phobos (god of fear, son of Ares) and Deimos (god of dread, twin of previous). Phobos orbits Mars so close that it revolves around Mars faster than Mars rotates.

Thus, from Mars it can be seen rising in the west, moving across the sky, set in the east, and then once more, before 1 Mars day (24 Earth hours and 39 Earth minutes) is over.

Phobo orbits Mars so close, and is getting 2 cm closer every year, than in 30 to 50 millions years, it will either fall onto Mars, or break apart and give Mars a rings system.

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