Thijs van der Laan

Thijs van der Laan

Thijs van der Laan
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Beautiful image of light paths near a black hole...

At just the right distance from the center of a black hole, light can orbit the black hole in a circular orbit called a photon sphere. The radius of the photon sphere is times larger than the Schwarzschild radius, inside which nothing can escape.

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"The Moon's Surface - Tycho". From Charles F Blunt's book 'The Beauty of the Heavens: a Pictorial Display of the Astronomical Phenomena of the Universe", 1842. Blunt included over one hundred illustrations, employing the relatively new printing process of lithography. The book incorporated an 1836 illustrated book, 'Uranographia', by an Elizabeth Blunt (relationship to CF Blunt unknown).

humanoidhistory: “Crater Tycho on the Moon, illustrated in The Beauty of the Heavens: A Pictorial Display of the Astronomical Phenomena of the Universe, by Charles F.