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  2. Fifth planet (hypothetical) - Wikipedia

    en.wikipedia.org/wiki/Fifth_planet_(hypothetical)

    The disruption hypothesis suggests that a planet which was positioned between Mars and Jupiter was destroyed, creating the asteroid belt between these planets. First proposed by astronomer Heinrich Wilhelm Matthias Olbers, scientists in the 20th century dubbed this hypothetical planet "Phaeton".

  3. Phaeton complex - Wikipedia

    en.wikipedia.org/wiki/Phaeton_complex

    Hugh Berrington expanded on the theory in 1974, finding sufferers of the Phaeton complex to be less sociable, flexible or tolerant, instead being ambitious, vain, sensitive, lonely and shy. [3] Micha Popper , though, disputes that an unhappy childhood always leads to obsessive urges, citing Winston Churchill as an example where childhood ...

  4. Phaeton (hypothetical planet) - Wikipedia

    en.wikipedia.org/wiki/Phaeton_(hypothetical_planet)

    Phaeton (alternatively Phaethon / ˈ f eɪ. ə θ ən / or Phaëton / ˈ f eɪ. ə t ən /; from Ancient Greek: Φαέθων, romanized: Phaéthōn, pronounced [pʰa.é.tʰɔːn]) is a hypothetical planet hypothesized by the Titius–Bode law to have existed between the orbits of Mars and Jupiter, the destruction of which supposedly led to the formation of the asteroid belt (including the ...

  5. Phaethon - Wikipedia

    en.wikipedia.org/wiki/Phaethon

    Phaethon (/ ˈ f eɪ. ə θ ən /; Ancient Greek: Φαέθων, romanized: Phaéthōn, lit. 'shiner', pronounced [pʰa.é.tʰɔːn]), also spelled Phaëthon, is the son of the Oceanid Clymene and the sun god Helios in Greek mythology.

  6. Theia (planet) - Wikipedia

    en.wikipedia.org/wiki/Theia_(planet)

    Theia (/ ˈ θ iː ə /) is a hypothesized ancient planet in the early Solar System which, according to the giant-impact hypothesis, collided with the early Earth around 4.5 billion years ago, with some of the resulting ejected debris coalescing to form the Moon.

  7. Development theory - Wikipedia

    en.wikipedia.org/wiki/Development_theory

    Human development theory is a theory which uses ideas from different origins, such as ecology, sustainable development, feminism and welfare economics. It wants to avoid normative politics and is focused on how social capital and instructional capital can be deployed to optimize the overall value of human capital in an economy.

  8. Developmental stage theories - Wikipedia

    en.wikipedia.org/wiki/Developmental_stage_theories

    Neo-Piagetian theories criticize and build on Piaget's work. Juan Pascaual-Leone was the first to propose a neo-Piagetian stage theory. Since that time several neo-Piagetian theories of cognitive development have been proposed. [12] These include the theories of Robbie Case, Grame Halford, Andreas Demetriou and Kurt W. Fischer.

  9. Developmental psychology - Wikipedia

    en.wikipedia.org/wiki/Developmental_psychology

    Specifically, the neo-Piagetian theories of cognitive development showed that the successive levels or stages of cognitive development are associated with increasing processing efficiency and working memory capacity. These increases explain differences between stages, progression to higher stages, and individual differences of children who are ...