Silver Star

Silver Stars appeared in Super Mario 64 DS, Super Mario Galaxy, and Super Mario Galaxy 2. They are basically a weaker and silver colored Power Star.

Super Mario 64 DS
Silver Stars first appeared in Super Mario 64 DS and are a new feature to the game. In some levels the player must collect 5 to get a Power Star. They are found in almost every course and in Sunshine Isles. If a character gets damaged while holding one or more Silver Stars, he will lose one and it will scatter and bounce around the area nonstop. The player must catch it again to retrieve it. The touch screen shows the location of these stars.

Similar physics are used in the multiplayer mode of Super Mario 64 DS and the missions may have been the inspiration of the multiplayer mode or the other way around. However, in multiplayer, the Silver Stars are replaced by Power Stars.

Super Mario Galaxy
Silver Stars reappear in Super Mario Galaxy having the same role as in Super Mario 64 DS. This time the player will not lose one if they manage to take damage.

Super Mario Galaxy 2
Silver Stars are going to appear in the upcoming game Super Mario Galaxy 2