Very rapid time variations help establish the tiny size of many X-ray sources, showing theymust be collapsed objects of some kind.

Question

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Very rapid time variations in X-ray sources indicate that they are small in size, which suggests that they are likely collapsed objects such as neutron stars or black holes. Very rapid time variations in X-ray sources suggest that they are small and compact objects, possibly indicating their collapse.

Very Rapid Time Variations Help Establish the Tiny Size of Many