Where Do Horizontal-Branch Stars Get Their Energy

question 199

Multiple Choice

Where do horizontal-branch stars get their energy?

• A) They have run out of nuclear fuel and must rely upon the Kelvin-Helmholtz mechanism.
• B) They have hydrogen fusion in their cores.
• C) They have helium fusion in their cores only.
• D) They have both core helium fusion and shell hydrogen fusion.

---

Definitions:

Madonna of the Rocks

An iconic Renaissance painting by Leonardo da Vinci depicting the Virgin Mary with the infant Jesus, John the Baptist, and an angel in a rocky setting.

Bramante

Donato Bramante, an Italian architect who introduced Renaissance architecture to Milan and the High Renaissance style to Rome, with St. Peter’s Basilica being among his most famed works.

Saint Peter's

A renowned basilica in Vatican City, serving as one of the most significant sites of Catholic worship and pilgrimage, notable for its grand architecture.

Dome

An architectural element that resembles the upper half of a sphere, often used to cover a large space.