On Sunday morning, Jupiter and Mars were half a moon-diameter apart. Now the moon is sweeping past. Plus Mercury and Saturn are in conjunction this weekend. Photos here.
You might see a sun pillar - or light pillar - extending upward (or downward) from a bright light source. They're caused by ice crystals drifting in Earth's air.
Will 2018 give us a bright comet? There are a couple of possibilities. In the meantime, here are some photos of comets, visible through telescopes, as 2018 begins.
Sea smoke forms when very cold air moves over warmer water. Jatinkumar Thakkar braved the cold to capture this photo at Nubble Lighthouse in Maine on New Year's Day.
High tides followed Monday's supermoon, as Storm Eleanor plowed into Europe. Then a "bomb cyclone" hit the U.S. East Coast. Photos here showing winter's power and terrible beauty.