1. You’d need more than a thin sheet of lead. The radiation in space can be very energetic. It can easily penetrate several cm of shielding and if it is absorbe

1. You’d need more than a thin sheet of lead. The radiation in space can be very energetic. It can easily penetrate several cm of shielding and if it is absorbed, you get secondary radiation. 2. Even a thin sheet of lead may be too heavy.