The waning Moon passes Jupiter, Venus, and Mercury before dawn, while Titan’s shadow transits Saturn in the sky this week.

The largest body in the main belt comes to a brief standstill in the sky, visible before sunrise in Cetus the Whale.

14. The Sun emits a continuous stream of plasma called the solar wind. On Earth, the most visible effect of the solar wind is the production of the northern and southern lights, the aurorae. Intense ...