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In our Universe, a black hole is bounded by a spherical surface called an event horizon. Whereas in ordinary three-dimensional space it takes a two-dimensional object (a surface) to create a boundary inside a black hole, in the bulk universe the event horizon of a 4D black hole would be a 3D object - a shape called a hypersphere. When Afshordi's team modelled the death of a 4D star, they found that the ejected material would form a 3D brane surrounding that 3D event horizon, and slowly expand. The authors postulate that the 3D Universe we live in might be just such a brane - and that we detect the brane's growth as cosmic expansion. "Astronomers measured that expansion and extrapolated back that the Universe must have begun with a Big Bang - but that is just a mirage," says Afshordi.

The event horizon telescope will only photograph the proximity to the event horizon, not the black hole itself which by definition remains invisible. If it succeeds it will be the first actual proof that black holes exist.

"Our mission at YC is to enable as much innovation as we can. Mostly this means funding startups. But startups aren't ideal for some kinds of innovation-for example, work that requires a very long time horizon, seeks to answer very open-ended questions, or develops technology that shouldn't be owned by any one company."

Chemistry labs with capable chemistry laboratory apparatus by A-grade Chemistry Lab Equipment Manufacturers broaden the horizons of experiential learning.

Chemistry labs with capable chemistry laboratory apparatus by A-grade Chemistry Lab Equipment Manufacturers broaden the horizons of experiential learning.