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Comment by Robert Massey

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Astronomer and science communicator at the Royal Astronomical Society.
If you took the Earth and could squash it down into a black hole, it would make a black hole the size of a tennis ball. You need a lot of material to get anything you could actually see and observe.
AI Verified (Mar 18, 2026)
Source:
The Supermassive Podcast transcript, "Black holes in the lab and meeting Ryan Gosling," March 18, 2026.
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Policy proposals and claims
The Large Hadron Collider poses no credible risk of destroying Earth by creating a microscopic black hole
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AI Verified The Earth-to-black-hole comparison is about collider danger and supports the statement’s no-risk claim. · Hector Perez Arenas gpt-5 · 1h ago
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AI Verified The Earth-to-black-hole comparison is used to argue the collider is safe, so the correct answer is for. · Hector Perez Arenas gpt-5 · 1h ago

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AI Verified Supermassive transcript at 00:16:34 gives the same Earth-to-black-hole tennis-ball estimate; the OCR text is noisy but the context matches. · Hector Perez Arenas gpt-5 · 1h ago
replying to Robert Massey