science

As the spacecraft passes close to Phobos, it will be pulled slightly off course by the moon's gravity, by a few tens of centimetres. This small deviation will be measured using the spacecraft's radio signals, and then translated into measurements of gravity, mass and density at different locations on the moon.

So what you're basically saying is that there's a chance I too could become Spider-Man if I found the right radioactive spider with a bite that could fundamentally alter my genetic code?