Final answer:
Miracles are events that violate the laws of nature and can only be caused by a Supreme Being like God. Proving an event to be a miracle is difficult as alternative explanations need to be ruled out and convincing evidence must be presented. Many skeptics argue that unusual events can often be explained by natural factors and therefore do not qualify as miracles.
Step-by-step explanation:
A miracle is an event that violates the laws of nature and can only be caused by the author of those laws, typically believed to be a Supreme Being like God. In order for an event to be considered a miracle, it must have no present naturalistic explanation and cannot be caused by advanced technology or alien societies.
However, proving an event to be a miracle is difficult, as alternative explanations need to be ruled out and convincing evidence must be presented. Many skeptics argue that unusual events can often be explained by natural factors and therefore do not qualify as miracles.