Once again in May, five planets will stretch along the early morning horizon. On Friday, around 5:30 a.m., Mars stands right in the east, and as you move your gaze toward the south, you will see Venus, Uranus and Neptune (for these two, you'll need binoculars or a telescope), and then Jupiter in the southeast. At the very end of the month, Mercury joins this array, making an appearance right on the eastern horizon.