Search reveals eight new sources of black hole echoes

Scattered across our Milky Way galaxy are tens of millions of black holes — immensely strong gravitational wells of spacetime, from which infalling matter, and even light, can never escape. Black holes are dark by definition, except on the rare occasions when they feed. As a black hole pulls in gas and dust from an […]

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Chromostereopsis

The effect varies for different people. Take a moment and look at this. Some people don’t see anything special: just a blue pupil in a red eye. Image: CC-BY Tom Stafford 2022 For me though, there is an incredibly strong depth illusion – the blue and the red appear as if they are at different […]

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