BOSTON -- Yahoo! has unveiled a new feature where celebrities pose questions that you can answer for a chance to win prizes.

The new promotion is called Ask The Planet If you are not already a member of Yahoo!, you'll need to register with the site to get started.

Each day, an actor, comedian or other celebrity will ask questions on a certain topic. There's a calendar on the site so you can see which stars will be asking questions.

Stand-up comic Dane Cook wants to know what the best Web sites are and what makes them so cool? The person with the best answer will win a new laptop.

Al Gore's question about the environment will score the winner a new car. Click and Clack from NPR's "Car Talk" have a question about transportation. The winner gets free gas for a year.

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