The Library of Congress can feel the power of love. On Thursday, the government body added 25 movies to its National Film Registry most notably Robert Zemeckis' 22-year-old time-travel comedy Back to the Future. Other popular selections that the Library found to be ''culturally, historically, or aesthetically significant'' were the 1968 Steve McQueen police thriller Bullitt, Steven Spielberg's 1977 sci-fi saga Close Encounters of the Third Kind, Terrence Malick's lush 1978 period epic Days of Heaven, and Kevin Costner's Oscar-winning 1990 Western Dances With Wolves. Older films inducted so as to be ''preserved for future generations to enjoy'' included 1932's Best Picture winner Grand Hotel, 1939's Wuthering Heights and The Women, 1942's Now, Voyager, 1957's 12 Angry Men, and 1962's The Man Who Shot Liberty Valance. With the addition of this year's entries, there are now 475 movies in the National Film Registry.