What Ionizes the Gas in a Planetary Nebula and Makes

question 5

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

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Definitions:

Revocation

The act of withdrawing, cancelling, or reversing a decision, offer, or statement.

Manufacturer

A manufacturer is a person or company that makes goods for sale, often involving the use of raw materials, machinery, and labor to produce finished products.

Landscape

The visible features of an area of land, including the physical elements of landforms, water bodies, living elements, and human elements such as structures and buildings.

Revocation

The act of withdrawing, cancelling, or rescinding a right, offer, contract, or privilege.