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  Polyhedra are beautiful 3-D geometrical figures that have fascinated philosophers, mathematicians and artists for millennia.On this site are more than eighty paper models available for free.   Platonic Solids  Dodecahedron  Cube and Tetrahedron  Octahedron  Icosahedron   Archimedean Solids  Cuboctahedron  Icosidodecahedron  Truncated Tetrahedron  Truncated Octahedron  Truncated Cube  Truncated Icosahedron (soccer ball)  Truncated dodecahedron  Rhombicuboctahedron  Truncated Cuboctahedron  Rhombicosidodecahedron  Truncated Icosidodecahedron  Snub Cube  Snub DodecahedronKepler-Poinsot Polyhedra Great Stellated Dodecahedron  Small Stellated Dodecahedron Great Icosahedron Great DodecahedronOther Uniform Polyhedra  TetrahemihexahedronOctahemioctahedronCubohemioctahedron Small RhombihexahedronSmall Cubicuboctahedron Small Dodecicosidodecahedron Small RhombidodecahedronSmall Dodecahemiododecahedron Small Ditrigonal IcosidodecahedronSmall Snub Icosicosidodecahedron Small IcosihemidodecahedronCompounds Stella Octangula Compound of Cube and Octahedron...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2003 January 6 Shadow Cone of a Total Solar Eclipse Credit & Copyright: Oliver Staiger (High Moon) Explanation: Sometimes, during a total eclipse of the Sun, a strange shadow of darkness can be seen stretching off into the distance. Called a shadow cone, they are visible because the Earth's atmosphere is not completely transparent, scattering sunlight and hence appearing blue during the day. Shadow cones are particularly dramatic...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 June 6 Cone Nebula Infrared Close-Up Credit: NICMOS Group (STScI, ESA), NICMOS Science Team (Univ. Arizona), NASA Explanation: After astronauts repaired NICMOS - the Near Infrared Camera and Multi-Object Spectrometer - during the latest Hubble Space Telescope servicing mission, astronomers were quick to turn the sophisticated instrument on the photogenic stellar nursery known as the Cone Nebula. This remarkable NICMOS close-up of the Cone Nebula dramatically confirms...

Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2002 May 3 Cone Nebula Close-Up Credit: ACS Science & Engineering Team, NASA Explanation: Cones, pillars, and majestic flowing shapes abound in stellar nurseries where natal clouds of gas and dust are buffeted by energetic winds from newborn stars. A well-known example, the Cone Nebula within the bright galactic star-forming region NGC 2264, was captured in this close-up view from the Hubble Space Telescope's newest camera. While the...