But how well do you really know our planetary neighbor? This quiz of 15 questions will test your knowledge of Mars' size, surface and history, as well as scientists' attempts to study it. Remember to ...
1. Beat all the ingredients for the batter in a deep bowl (except for the egg whites) until smooth. 2. Beat the egg whites until stiff and carefully add to the batter. 3. Peel and grate the apples.