High-mass stars burn hotter & brighter because they have more _______ at their cores.

Why do high-mass stars skip the helium flash stage that low-mass stars go through before dying?

When temperatures are high enough in the core of a high-mass star, this element starts to form.

When fusion in low-mass stars form this element in its core, the helium flash stage begins.

When an ______ core is reached in a high-mass star, gravity takes over.

When an iron core is reached gravity takes over and a(n) _________ occurs.

Supernovas are one of the largest _______ in the Universe.

Almost all stars form from nebulae at about the same time in _____.

_____ stars evolve and move off the main-sequence first; then intermediate stars & so on.

The dividing line between high & low-mass stellar evolution is called the