From an Observational Standpoint,what Is a Pulsar

question 107

Multiple Choice

From an observational standpoint,what is a pulsar?

• A)a star that slowly changes its brightness,getting dimmer and then brighter with a period of anywhere from a few hours to a few weeks
• B)an object that emits flashes of light several times per second or more,with near perfect regularity
• C)an object that emits random "pulses" of light that sometimes occur only a fraction of a second apart and other times stop for several days at a time
• D)a star that changes color rapidly,from blue to red and back again
• E)a star that rapidly changes size as it moves off the main sequence

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