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The prevailing theory during Copernicus's lifetime was the one that Ptolemy published in his Almagest c. 150 CE; the Earth was the stationary center of the universe. Stars were embedded in a large outer sphere that rotated rapidly, approximately daily, while each of the planets, the Sun, and the Moon were embedded in their own, smaller spheres.
He proposed the theory of the four humors and a natural origin of living things. "Blue Monkeys" Bronze Age Akrotiri. 500 BC. Xenophanes (Greek, 576–460 BC), a disciple of Pythagoras (570–497 BC), first recognized fossils as animal remains and inferred that their presence on mountains indicated the latter had once been beneath the sea. "If ...
Ernst Haeckel. Ernst Heinrich Philipp August Haeckel (German: [ɛʁnst ˈhɛkl̩]; 16 February 1834 – 9 August 1919) [1] was a German zoologist, naturalist, eugenicist, philosopher, physician, professor, marine biologist and artist. He discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms ...
Zoo hypothesis. The zoo hypothesis speculates on the assumed behavior and existence of technologically advanced extraterrestrial life and the reasons they refrain from contacting Earth. It is one of many theoretical explanations for the Fermi paradox. The hypothesis states that extraterrestrial life intentionally avoids communication with Earth ...
The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. Research published in 2015 estimates the earliest stages of the universe's existence as taking place 13.8 billion years ago, with an uncertainty of around 21 million years at the 68% confidence level.
Alfred Russel Wallace OM FRS (8 January 1823 – 7 November 1913) was an English [1] naturalist, explorer, geographer, anthropologist, biologist and illustrator. [2] He independently conceived the theory of evolution through natural selection; his 1858 paper on the subject was published that year alongside extracts from Charles Darwin's earlier writings on the topic.
Empedocles. Empedocles (/ ɛmˈpɛdəkliːz /; Greek: Ἐμπεδοκλῆς; c. 494 – c. 434 BC, fl. 444–443 BC) was a Greek pre-Socratic philosopher and a native citizen of Akragas, a Greek city in Sicily. Empedocles' philosophy is best known for originating the cosmogonic theory of the four classical elements.
This article considers the history of zoology since the theory of evolution by natural selection proposed by Charles Darwin in 1859. Charles Darwin gave new direction to morphology and physiology, by uniting them in a common biological theory: the theory of organic evolution. The result was a reconstruction of the classification of animals upon ...