More than 4,300 flights were canceled across the U.S. through Friday as a massive winter storm impacted holiday travel plans with a triple threat of heavy snow, howling winds and bitter cold. Blinding whiteouts and hazardous road conditions were already being seen as a result of a dangerous Arctic front. The bomb cyclone is sweeping across the U.S. as millions of Americans hit the highway or airways for the holiday.

WHICH AMERICANS WILL WAKE UP TO A WHITE CHRISTMAS?

Ukraine is bracing for a possible large-scale Russian missile attack before Christmas after Russia vowed to continue the war during the holidays. Russia plans to launch all available cruise missile carriers with a range of 300 miles or more, an the intelligence source said, adding the Russian military is also considering using Unmanned Aerial Vehicles in its planned airstrike against Ukraine before Christmas.

SEE RUSSIA'S OMINOUS WARNING TO UKRAINE AND THE US

Google-owned YouTube TV has signed a multi-year deal to exclusively stream the NFL's Sunday Ticket package of games in the U.S., as more content moves from traditional TV to streaming. YouTube TV will pay $2 billion a year to secure rights to the franchise. Starting next season, NFL Sunday Ticket will be available as an add-on package on YouTube TV and stand-alone a-la-carte on YouTube Primetime Channels.

HOW YOUTUBE TV TOOK THE SUNDAY TICKET FROM DIRECTV

How much were the TV rights to air the first NFL championship game?

Thursday's answer: Mars is 55.5 million light years from Earth. NASA's Mars Insight mission cost $828.8 million, or $15 per light year traveled.