The trio of (L to R) Saturn, Mars and Jupiter in conjunction in the dawn twilight, taken from home in Alberta on March 26, 2020. LOS ANGELES - If you missed last month’s "Christmas star," you’ll have another chance to see a spectacular planetary phenomenon in January.For the first time since October of 2015, sky-gazers will have the chance to view a planetary trio — when three planets will be bunched together in the atmosphere.The planetary trio "presents the first of two planetary trios in the year 2021; and the first of four planetary trios in the 203rd decade or the period from January 1, 2021, to December 31, 2030," EarthSky wrote.What is a planetary trio?According to EarthSky, a planetary trio consists of three planets "fitting within.