If you mark some Martian surface features on Planet Four over the next few days you could win some of these fabulous stickers! The giveaway has been set up to celebrate the 10th anniversary of the launch of Mars Reconnaissance Orbiter and the HiRISE camera. All you have to do to be in with a chance of winning is submit some classifications at www.planetfour.org, so get on over there right now!

Read more about the giveaway in this blog post by the science team.