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 3:11 Ryan Gosling skips darker film roles because of Eva Mendes and daughters 1:07 Britney Spears spotted as authorities respond to alleged hotel incident 2:15 Prince William and Kate Middleton ‘going through hell,' friend claims (report) 8:01 Lady Gaga's outfit changes, Rihanna's bold looks and more iconic Met Gala moments 2:48 Taylor Swift fans react to Jake Gyllenhaal and Sabrina Carpenter's ‘SNL' appearance