For your final Gallery of 2018, here are some images of the Sun and Moon (and humanity) in perspectives you may not have seen before.
Multi-wavelength extreme ultraviolet snapshot of the Sun from the Solar Dynamics Observatory during an August, 2010 solar outburst
The International Space Station photographed transiting the full moon in January, 2018. The winter solstice in the Northern Hemisphere coincided with a full moon a few days ago.
Another manner of solstice celebration: Stonehenge
And a polar bear plunge to ring in the new year