Silver Star

From the Super Mario Wiki

Silver Stars first appeared in Super Mario 64 DS and are a new feature to the game. They are basically a weaker and silver colored Power Star. 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.

A Silver Star in a Star Sphere, in Super Mario Galaxy.

Silver Stars reappear in Super Mario Galaxy having the same role as in Super Mario 64 DS. They make the same noises as Lumas do, possibly meaning they're a different species of Luma. This time the player will not lose one if the player take damage.

Also, when the level is already defeated, instead of the usual Power Star, it is now a Silver Star, which does not gain the player any more stars in their "Star Count".

Artifacts

Courses and Mini-Stages of Super Mario 64 and Super Mario 64 DS
Bob-omb Battlefield \| Whomp's Fortress \| Jolly Roger Bay \| Cool, Cool Mountain \| Big Boo's Haunt \| Hazy Maze Cave \| Lethal Lava Land \| Shifting Sand Land \| Dire, Dire Docks \| Snowman's Land \| Wet-Dry World \| Tall, Tall Mountain \| Tiny-Huge Island \| Tick Tock Clock \| Rainbow Ride \| Tower of the Wing Cap \| Vanish Cap Under the Moat \| Cavern of the Metal Cap \| The Princess's Secret Slide \| The Secret Aquarium \| Wing Mario Over the Rainbow \| Bowser in the Dark World \| Bowser in the Fire Sea \| Bowser in the Sky \| Roof \| Sunshine Isles \| Battle Fort \| Goomboss Battle \| Big Boo Battle \| Chief Chilly Challenge
Super Mario 64 and Super Mario 64 DS Items
Power Star \| Gold Coin \| Blue Coin \| Red Coin \| Silver Star \| 1-Up Mushroom \| Mushroom \| Power Flower \| Wing Cap \| Vanish Cap \| Metal Cap
Super Mario 64 and Super Mario 64 DS Objects and Obstacles
Bill Blaster \| ! Block \| ! Switch \| ? Block \| ? Switch \| Blue Coin Block \| Crystal Tap \| Green Shell \| Cannon \| Star Marker \| Crazed Crate \| Donut Lift \| Lava \| Pushy Walls \| Pyro Box \| Spinning Heart \| Treasure Box

Stars

Hosts of the Mario Party series
Big Top \| Boo \| Brighton \| Goomba \| Koopa Kid \| Koopa Troopa \| MC Ballyhoo \| Millennium Star \| Paragoomba \| Shy Guy \| Star Spirits \| Toad \| Toadsworth \| Tumble \| Twila