Matter and energy can be past-eternal

[ManofYesterday]

Appeal to Authority:
"Using an authority as evidence in your argument when the authority is not really an authority on the facts relevant to the argument.  As the audience, allowing an irrelevant authority to add credibility to the claim being made."
https://www.logicallyfallacious.com/tools/lp/Bo/LogicalFallacies/21/Appeal-to-Authority

Stephen Hawking is a renowned physicist so invoking his knowledge of the big bang isn't an appeal to authority because he is an authority in physics.

Alex claims he's a physicist, without providing any evidence, and you as well as several others have invoked his knowledge to refute my knowledge of cosmology. The problem is it hasn't been established that Alex is an authority in physics. He's only claimed to be an expert.

So you're the one who is making an appeal to authority.

Game. Set. Match.

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His evidence is that he knows what he's talking about.  Instead of asking for his credentials, why don't you answer his question, and unless he's tired of your juvenile rants, he might actually teach us something about physics.

He doesn't know what he's talking about though. I've demonstrated that. He didn't know that many cosmologists see the big bang as a singularity. He didn't know what a singularity was... Etc.