It's made out of the blackest black in the world: Vantablack.
SINGULARITY V3 - Our darkest ever objects
Could Vanta Black be used to gather heat/light energy to convert into power? - Quora
Blacker than Black – Exoplanet Exploration: Planets Beyond our Solar System
BACK TO THE BIENNALE. BECAUSEVENICE — Loves Art Will Travel
A window into the void: This is Vantablack, the darkest black ever created, Culture
Anish Kapoor's Material Values
I bought some of the world's blackest paint, and it makes this ping pong ball look almost flat. : r/mildlyinteresting
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How They Made It: The Marble Moon - Hodinkee