> is there a shield planned for the Orion spacecraft
Not sure what they are using in Orion. The general answer is that, yes, there has to be a shield. Historically that has been aluminum. Mass is a huge problem in going to space. Because of this, you can't have the shield you really want.
Over the years we have learned that thick laminated (under heat and pressure) polyethylene is a better space radiation shield than aluminum and at a significant savings in weight.
Not sure what they are using in Orion. The general answer is that, yes, there has to be a shield. Historically that has been aluminum. Mass is a huge problem in going to space. Because of this, you can't have the shield you really want.
Over the years we have learned that thick laminated (under heat and pressure) polyethylene is a better space radiation shield than aluminum and at a significant savings in weight.