Jupiter, Mercury, Venus, Uranus and Mars are expected to align March 28.. A spectacular celestial sight is on the horizon and you won't want to miss it. Planets Jupiter, Mercury, Venus, Uranus and Mars are expected to align in the night sky on March 28. Planetary alignments occur when the orbit of several planets coincide with each other and they appear to be lined up in the sky. Alignments typically only include two or three planets and are fairly brief, making a 5-planet alignment fairly noteworthy. This rare planetary parade will first become visible in the western sky just after...