TED-Ed: Dark matter: How does it explain a star's speed? - Don Lincoln

The video explores the beauty and stability of spiral galaxies, explaining how Newton's principles help predict star movements. However, unexpected observations of star speeds challenge traditional theories, leading to the dark matter hypothesis. Dark matter, though unseen, is believed to influence galactic gravity and star orbits, making it a crucial research topic in modern physics.

What is dark matter and why is it significant in understanding galaxies?

What ongoing efforts are scientists making to find evidence of dark matter?