Does Dark Matter Cause Extinctions?

The video discusses extinction events occurring every 30 million years, possibly linked to dark matter in the galactic disk affecting comet orbits and causing mass extinctions. It also explores the hypothesis that dark matter could heat Earth's core, leading to volcanic activity. Additionally, the video covers Schultz's star, which passed close to our solar system, potentially disturbing comets in the Oort cloud.

What challenges do scientists face in proving the existence and effects of dark matter?

Describe the significance of Schultz star's proximity to our solar system and its potential effects.