What Ionizes the Gas in a Planetary Nebula and Makes

question 85

Multiple Choice

What ionizes the gas in a planetary nebula and makes it visible?

• A) X-ray photons emitted by a pulsar
• B) ultraviolet photons emitted by a white dwarf
• C) the shock wave from a supernova
• D) hydrogen burning in the nebular gas
• E) infrared photons from a nova explosion

---

Definitions:

Synaptic Connections

The points at which neurons communicate with each other through chemical signals across the synaptic gap.

Cognitive Maps

Mental representations of physical locations, helping individuals to navigate through and understand spatial environments.

Belief Systems

A structured set of principles and expectations about the world that influence an individual's perception and actions.

Associations

Connections or links formed in the mind between ideas, concepts, or phenomena, often resulting from learning or experience.