The popular Jupiter Shield theory proposes that the planet acts like a giant space shield due to its huge mass causing it to suck in or deflect dangerous debris. However, this shield theory is slowly falling out of favor and one of the leading critics is space expert Kevin Grazier. [Kevin R. Grazier, Ph.D.] He's published several papers explaining why he thinks Jupiter is a "sniper rather than a shield". Recently, he's been aiming to prove how this 'sniper-like' process works. Grazier's extensive work could put the Jupiter Shield theory in jeopardy. He told Gizmodo: "Actually, I wouldn't say that...