From the Super Mario Wiki
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“The shadowy star in front of you is a '"Star Marker." When you collect all 8 Red Coins, the Star will appear here.”
Star Markers are types of stars found in Super Mario 64 and its remake Super Mario 64 DS. These star-shaped shadows mark the spot where a Power Star appears once Mario collects all eight Red Coins in a level. The Power Star is only obtainable once the eight red coins have been collected. Once Mario obtains all 8 red coins however, the Star Marker will still be under the Power Star.
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