cheap science fiction shows. basically the bubbling you are seeing is not boiling, it's sublimating the comet is now, too, losing 2 to 3 million tons of material a second today as it goes around the sun. it's hurdling around the sun 18,000 miles an hour. it's hot enough to melt steel. will it survive? >> we'll see! we'll keep our eyes to the sky. thank you very much, david dundee, for coming in, especially on thanksgiving. >> happy thanksgiving. >> we'll be right back. ♪ through 12 blizzards blowing ♪ 8 front yards blinding ♪ 6 snowballs flying ♪ 5 packages addressed by toddlers ♪ ♪ that's a q ♪ 4 lightning bolts ♪ 3 creepy gnomes ♪ 2 angry geese ♪ and a giant blow-up snowman ♪ that kind of freaks me out [ beep ] [ female announcer ] no one delivers the holidays like the u.s. postal service.