Today, Mercury passes 2° north of Jupiter at 4 P.M. EDT. You can catch them together in the evening twilight, sinking in the west after sunset. But be quick: They are just a few degrees above the ...

This month will usher in two separate conjunctions — one between the moon and a rarely-visible Mercury, and another between the moon and Mars.

Today: You know Metis and Thebe and Adrastea and Amalthea. Io and Ganymede and Callisto and Europa.