Nightly news begins now. From nbc news World Headquarters in new york, this nbc nightly news with brian williams. Good evening. Im lester holt in tonight for brian. The sky is not falling, but you would be forgiven if the thought crossed your mind after kpro spectacular but apparently unrelated cosmic Close Encounters today within just hours of each other. This morning in a remote part of russia, some thought the world was ending when a tenton meteor, five stories tall, hurtled to earth and exploded, causing a lot of injuries and doing a lot of damage without actually hitting anything. Its fiery descent was captured in vivid detail by numerous cameras. And then this afternoon there was a very close call with a massive astroid that whizzed by just 17,000 miles from our planet. In sell celestial terms, thats a narrow miss. Nbcs tom costello reports. Reporter the video from russia is incredible. A massive meteor traveling at 33,000 miles per hour, trailing a brilliant quite con trail, hit