English: This is a Focus movie from Stardust@home's second Virtual Microscope Focus movie Tutorial. Images are courtesy of the UC Berkeley Space Sciences Laboratory.

This is not Actual Stardust but rather

The Site says

For the following training tutorial, we have used tracks of extraterrestrial particles that were captured in the ODCE collector on the Russian space station Mir, and tracks of submicron dust particles shot into aerogel at 20 km/sec using a Van Der Graaf dust accelerator in Heidelberg, Germany. It may turn out that the tracks of real interstellar dust will look quite different. They may be deeper or shallower, wider or narrower. We will see once we have the first few examples of real interstellar dust!