The origin of Earth's water remains a mystery. Scientists are still determining whether it originated from comets or asteroids or was already present within the Earth during its formation.
The Moon's formation theory is a contentious one, with some suggesting a massive Earth-Mars collision, while others suggest Earth's gravity or simultaneous formation alongside Earth.
Planets like Jupiter, Saturn, Uranus, and Neptune have strong magnetic fields, but their exact mechanisms and dynamics are not fully understood.
Uranus's 98-degree axial tilt, a mystery, could be attributed to collision or gravitational pull from nearby planets.
Potential explanations include the remnants of a moon shattered by tidal pressures or debris from comet encounters. It remains uncertain.
There are some mysterious features on Mars, including seasonal variations, methane spikes, and recurrent slope lines, which may be signs of liquid water.
Objects in the Kuiper Belt, like Pluto and other dwarf planets, have varied compositions, making it challenging to understand their origins and diversity.