Protostars, When They First Form from the Interstellar Medium, Are

question 325

Multiple Choice

Protostars, when they first form from the interstellar medium, are usually

• A) very bright in ultraviolet light due to numerous flares that are hotter and brighter than solar flares.
• B) detected by emission lines in their visible spectra, emitted by gas being blown off their surfaces into space.
• C) easily detected because their light ionizes the surrounding interstellar gas, or reflection nebulae.
• D) hidden from sight by dust clouds that emit infrared radiation.

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