A Reflection Nebula Is Made Visible by

question 232

Multiple Choice

A reflection nebula is made visible by

• A) thermal energy emitted as a continuous spectrum by the very hot gas, much like that emitted by a hot body on Earth.
• B) light from embedded stars reflected over a wide range of wavelengths toward Earth by crystals of water, methane, and ammonia ices.
• C) emission lines from hydrogen, which itself has been ionized by UV light from embedded stars.
• D) blue light preferentially scattered by dust grains.

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Definitions:

Floating-Rate Bonds

Bonds with variable interest rates that adjust periodically based on a benchmark interest rate or index.

Coupon Rate

The interest payment made annually on a bond, shown in percentage terms of its face value.

Time To Maturity

The duration remaining until the final payment date of a loan, bond, or other financial instrument, at which point the principal (and usually the final interest payment) is due to be paid.

Interest Rate Risk

The risk that the value of an investment will decrease due to a change in interest rates.