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Very rapid time variations help establish the tiny size of many X-ray sources, showing they must be collap?

Very rapid time variations help establish the tiny size of many X-ray sources, showing they must be collapsed objects of some kind.
True or False?

True,
Rapid variations show that the source must small – smaller than the distance light travels in the time of the variation. They must be very energetic to produce X rays. Only collapsed objects of some kind like neutron stars, or a black hole (see link) could pack that much energy into a small space.

RAY NOBLE ORCHESTRA (1934): The Very Thought of You

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Steaming brook – after a very cold winter night Photo Mugs SAS-340 Steaming brook – after a very cold winter night Baden-Wuerttemberg, Germany Steffen a Alexandra Sailer Please note that prints are for personal display purposes only and may not be reproduced in any way. contact details prints ardea tel 020 8672 2067….

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