To an Astronomer,what Is a "Standard Candle

question 121

Multiple Choice

To an astronomer,what is a "standard candle"?

• A) A standard light source that can be placed in a telescope,to which the brightness of stars and other objects can be compared
• B) Any type of object whose absolute magnitude is known
• C) Any galaxy whose redshift has been measured accurately
• D) An accurately defined brightness scale for stars and galaxies,such as the magnitude scale

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Definitions:

Greenstick

A type of incomplete fracture in bones, most common in children, where the bone bends and cracks without completely breaking.

ACE Wrap

A brand of elastic bandage typically used to provide support and reduce swelling following an injury.

Ankle Brace

A supportive garment or device worn around the ankle to protect it or to provide stability after an injury.

Compression

To exert force against, press.