Em Drive

Even if you don’t keep up with developments in space propulsion technology, you’ve still probably heard about the EmDrive.

 You’ve probably seen headlines declaring it the key to interstellar travel, and claims that it will drastically reduce travel time across our solar system, making our dreams of people walking on other planets even more of a reality. There have even been claims that this highly controversial technology is the key to creating warp drives.

Simply put, the EmDrive is a conundrum. First designed in 2001 by aerospace engineer Roger Shawyer, the technology can be summed up as a propellant less propulsion system, meaning the engine doesn’t use fuel to cause a reaction. Removing the need for fuel makes a craft substantially lighter, and therefore easier to move (and cheaper to make, theoretically). In addition, the hypothetical drive is able to reach extremely high speeds — we’re talking potentially getting humans to the outer reaches of the solar system in a matter of months.We’re talking potentially getting humans to the outer reaches of the solar system in a matter of months.The issue is, the entire concept of a reaction less drive is inconsistent with Newton’s conservation of momentum which states that within a closed system, linear and angular momentum remains constant regardless of any changes that take place within said system. More plainly: Unless an outside force is applied, an object will not move.Reaction less drives are named as such because they lack the “reaction” defined in Newton’s third law: “For every action there is an equal and opposite reaction.” But this goes against our current fundamental understanding of physics: An action (propulsion of a craft) taking place without a reaction (ignition of fuel and expulsion of mass) should be impossible. For such a thing to occur, it would mean an as-yet-undefined phenomenon is taking place — or our understanding of physics is completely wrong.
Em Drive

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