space December 21, 2020 1:17 pm Rare ‘Christmas Star' Will Be Visible on Monday for First Time in 800 Years NASA says the planetary conjunction known as the ‘Christmas Star,’ which is only seen once every 800 years, will be visible on Monday night. US & World Videos 2:10 Justin Bieber mentioned wanting a baby with Hailey Bieber 4 years ago 5:00 Kelly Clarkson surprises trailblazing music educator with childhood teacher 3:02 Daughter surprises mom and nana with touching letter for Mother's Day 6:00 Luis A. Miranda Jr. brought entire Puerto Rico family to cheer Lin-Manuel Miranda at Tony Awards 6:15 Parents of Harmony Montgomery's half-brother read his emotional victim impact statement: ‘I need my big sister'