Avatar tops $500 million on domestic chart

James Cameron's Avatar continues to close in on his own box-office champ Titanic. Avatar took in $54.4 million over the four-day Martin Luther King Jr. Day weekend, raising its domestic total to $504.9 million. On the all-time domestic chart, the sci-fi blockbuster trails only The Dark Knight at $533 million and Titanic at $600 million. Worldwide, Avatar has taken in $1.6 billion, second only to Titanic at $1.8 billion.