KWE327822: Maharaja Ranjit Singh, from 'Gallery of Historical Portraits', published c.1880 (litho), English School, (19th century) / Bridgeman Images

NMG328354: The Last Judgement, 1473 (oil on panel) (detail of 144071), Memling, Hans (c.1433-94) / Bridgeman Images

XPH308494: Emperor Wilhelm I and Prince Bismarck (colour litho), German School, (19th century) / Bridgeman Images

LLM339799: Elijah rebuking Ahab, Gow, Mary L. (1851-1929) / Bridgeman Images

LLM339699: Jesus withe the one leper who returned to give thanks, Hole, William Brassey (1846-1917) / Bridgeman Images

LAL301172: Cave paintings, Jackson, Peter (1922-2003) / Bridgeman Images

PER320978: Poster advertising 'Michelin tyres are faster than rail!' (colour litho), Montaut, Ernest (1878-1909) / Bridgeman Images

CHT322520: Prince Ivan and the Firebird, illustration for the Russian Fairy Story, 'The Firebird', published in Saint Petersburg, 1901 (colour litho), Bilibin, Ivan (1876-1942) / Bridgeman Images

LAL313498: Bali Tiger, Wilson, Maurice (1914-87) / Bridgeman Images

KWE342831: Map of Central Europe showing Napoleon's Empire in 1810, from 'Historical Atlas', published by W. & A.K. Johnston Limited, 1911 (colour litho), English School, (20th century) / Bridgeman Images

BRM349519: The Black Bow, 1882-3 (conte crayon), Seurat, Georges Pierre (1859-91) / Bridgeman Images

CHT365097: Panoramic view and plan of Sevastopol and the Black Sea Coast at the time of the Crimean War, 1855 (litho), French School, (19th century) / Bridgeman Images

ANC351847: A woman with a flower (mosaic), Roman / Bridgeman Images

HLN428563: Azaleas, 1868 (oil on canvas), Moore, Albert Joseph (1841-93) / Bridgeman Images

DGC437487: Eugen Sandow, in classical ancient Greco-Roman pose, c.1894 (b/w photo), Falk, Benjamin J. (1853-1925) / Bridgeman Images

KWE387036: A phrenological map of the human brain, from 'Virtue's Household Physician', published in 1924 (lithograph), English School, (20th century) / Bridgeman Images

LLM457085: Goethe, Maclise, Daniel (1806-70) (after) / Bridgeman Images

LAL453530: Wyatt Earp and the Battle of the OK Corral, English School, (20th century) / Bridgeman Images

LLM459597: Galen assisting a gladiator, wounded in the circus of Bergamo, Planella Coromina, Josep or Jose (1804-90) / Bridgeman Images

LRI702676: A Jewish Family celebrating Passover (vellum), Italian School, (15th century) / Bridgeman Images

DGC696867: The construction of the Statue of Liberty, detail of the face, c.1876 (Sepia Photo), French Photographer, (19th century) / Bridgeman Images

BAT499374: The Crucifixion, c.1288-89 (tempera on panel) , Giotto (Giotto di Bondone) (c.1266-1337) / Bridgeman Images

MOU162521: Portrait of Lord Palmerston (1784-1865) (oil on canvas), Claxton, Marshall (1811-81) / Bridgeman Images

GBW469872: Palm Tree, 1925 (b/w photo), Modotti, Tina (1896-1942) / Bridgeman Images

LLM461671: Giordano Bruno, Scarpelli, Tancredi (1866-1937) / Bridgeman Images

PNP468353: USS Constitution and HMS Java (colour litho) / Bridgeman Images

PNP1127232: Leif Ericson sails past icebergs on his voyage to Newfoundland in c.1000 (colour litho), English School, (20th century) / Bridgeman Images

LRI4587904: Detail of the Nilotic mosaic of Preneste (Palestrina) from the shrine of the deity of Fortune Primigenia, 80 BC, Roman, (1st century BC) / Bridgeman Images

LRI4582279: Portrait of Marie de Medicis (1573 - 1642), wife of Henry IV and mother of Louis XIII Painting by Frans Pourbus Le Jeune (Francois (Franz) Porbus, 1569-1622) circa 1609. Pitti Palace, Florence., Pourbus, Frans II (1569-1622) / Bridgeman Images

JLJ4574013: Portrait of Louis XIV king of France, protector of the Royal Academy of Painting and Sculpture, with the sceptre of Charles V dit de Charlemagne, 17th century (oil on canvas), Testelin, Henri (1616-95) / Bridgeman Images

JLJ4574538: The Blue or Nude Room at the Fan, 1891 (painting), Ranson, Paul (1863-1909) / Bridgeman Images

LRI4575619: Virgin and Child and Six Angels (Virgin of the pomegranate), circa 1887 (tempera on wood), Botticelli, Sandro (Alessandro di Mariano di Vanni Filipepi) (1444/5-1510) / Bridgeman Images

LRI4594416: Saint John Evangelist. Marble Sculpture, 1412-1415, Donatello, (c.1386-1466) / Bridgeman Images

JLJ4595213: Universal suffrage: A polling station, 1889 (painting), Bramtot, Alfred-Henri (1852-94) / Bridgeman Images

JLJ4599856: Champetre dance The announcement to the shepherds, 1480 (miniature), Testard, Robinet (fl.1475-1523) / Bridgeman Images

PIX4633164: Earth at the end of Permian - Ring arcs over the Permian Earth - A ring of rocks and dust is orbiting the Earth. The massive continent below is Pangee and the ocean to the west is Panthalassa. This is what Earth was supposed to look like at the end of Permian, about 260 million years ago, before the first dinosaurs appeared. This ring around the Earth was of earthly origin, constitutes debris thrown into orbit by collision with a meteorite or comet. Over time, these debris have either fallen or fallen back to Earth in a meteorite rain. A dusty ring arc orbits four thousand miles above Earth's equator. The massive continent below is Pangea and the ocean to the west is Panthalassa. This is how the Earth may have appeared during the end of the Permian period, a time just prior to the appearance of the dinosaurs, when continental drift was pulling Pangea apart into the seven continents we know today. 260 million years ago the Earth may have been host to ring arcs similar to the incomplete rings that currently circumscribe the planet Neptune. Unlike Neptune's rings, the ring arcs around the Earth were of terrestrial origin, debris thrown into orbit by a collision with a large meteorite or comet. The debris consisted of tiny pebbles that were once molten droplets of ejecta, long since cooled in the vacuum of space. The orbit of the ring arc would eventually decay, returning the debris back to Earth as a shower of meteorites. This debris is found on Earth's surface today in the form of dark, glassy objects known as tektites / Bridgeman Images