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Meet Sgr A*: Zooming into the black hole at the centre of our galaxy
Credit: European Southern Observatory. A multimillion-pound research project will see some of the world's leading experts use ...
A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...
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