Uranus spins on its side, with some rather strange results
Most of the planets in the Solar System spin on an axis similar to the
Sun’s; slight tilts in a planet’s axis causes seasons as different parts
become slightly closer or further from the sun during their orbit. Uranus
is an exceptional planet in many ways, not least because it spins
almost completely on its side in relation to the Sun. This results in
very long seasons – each pole gets around 42 Earth years of continuous
summer sunlight, followed by a wintry 42-year period of darkness.
Uranus’s northern hemisphere enjoyed its last summer solstice in 1944
and will see in the next winter solstice in 2028.Source: http://www.lifehack.org/articles/lifestyle/20-extraordinary-and-inspiring-facts-about-the-universe.html
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