(As requested, eto na po 😊)
TRIVIA: EARTH AND LIFE SCIENCE
LESSON 1 and 2 about ORIGIN OF THE UNIVERSE AND THE SOLAR SYSTEM
⭐ UNIVERSE (The listed below are the summarized and shortest version of theories about the origin of the universe)
1) Brahmanda (Cosmic Egg) Universe - The Hindu Rigveda, written in India around 15th-12th century B.C., describes a cylical or oscillating universe in which a "cosmic egg", or Brahmanda, containing the whole universe (including the sun, moon, planets, and all of space) expands out of a single concentrated point called Bindu before subsequently collapsing again.
2) Atomist Universe - Later in the 5th century B.C., the Greek philosophers Leucippus and Democritus founded the school of Atomism, which helf that the universe was composed of very small, and indivisible amd indestructible building blocks known as atoms.
3) Aristotelian Universe - The Greek philosopher Aristotle, in the 4th century B.C., established a geocentric universe in which the fixed, spherical Earth is at the centre, surrounded by concentric celestial spheres of planets and stars.
4) Heliocentric Universe - The 3rd century B.C. Greek astronomer and mathematician Aristarchus of Samos was the first to present an explicit argument for a heliocentric model of the solar system, placing the sun, not the Earth at the center of the known universe.
5) Static (or Newtonian) Universe - In 1687, Sir Isaac Newton published his "Principia", which described among other things, a static, steady state, infinite universe.
6) Big Bang Model of the Universe - After Edwin Hubble's demonstration of the continuously expanding universe in 1929, some version of the Big Bang Theory has generally been the mainstream scientific view. From Georges Lemaitre (1927) to Fred Hoyle (1949).
7) Oscillating Universe - This was Einstein's favoured model after he rejected his own original model in the 1930s.The oscillating universe followed from Alexander Friedmann's model of an expanding universe based on the general relativity equations for a universe with positive curvature (spherical space) which result in the universe expanding for a tine and then contracting due to the pull of its gravity, in a perpetual cycle of Big Bang theory followed by Big Crunch.
8) Steady State Universe - This non-standard cosmology has occured in various versions since the Big Bang Theory was generally adopted by the scientific community. A popular variant of the steady state universe was proposed in 1948 by the English astronomer Fred Hoylr and the Austrians Thomas Gold and Hermann Bondi.
9) Inflationary (or Inflating) Universe - In 1980, the American physicist Alan Guth proposed a model of the universe based on the big bang, "but incorporating a short, early period of exponential cosmic inflatoon" in order to solve the horizon and flatness problems of the standard Big Bang model.
10) Multiverse - The Russian-American Physicist Andrei Linde developed inflationary universe idea further in 1983 with his chaotic inflation theory, which sees our universe as just one of many 'bubbles' that grew as part of a multiverse. The American Physicists Hugh Everett III and Bryce Dewitt had initially developed and popularized their 'many worlds' formulation of the multiverse in the 1960s and 1970s.
🌏 SOLAR SYSTEM (The listed below are the summarized and shortest version of theories about the origin of the solar system.
1) NEBULAR THEORY - In the 1700s, Emanuel Swedenborg, Immanuel Kant, and Pierre-Simon Laplace independently thought of a rotating gaseous cloud that cools and contract the middle to form the Sun and the rest into a disc that become the planets. This nebular theory failed to account for the distribution of angular momentum in the solar system.
2) ENCOUNTER HYPOTHESIS (Maraming versions ang napropose under this hypothesis)
• Buffon's (1749) Sun-comet encounter that sent matter to form planet.
• James Jean's (1917) Sun-star encounter that would have drawn from the sun matter that would condensed to planets.
• T.C Chamberlain and F.R. Moulton's (1904) planetisimal hypothesis involving a star much bigger than the sun passing by the sun and draws gaseous filaments from both out which planetisimals were formed.
• Ray Lyttletons's (1940) sun's companion star colliding with another to form proto-planet that breaks up to form Jupiter and Saturn.
• Otti Schmidt's accretion theory proposed that sun passed through a dense interstellar cloud and emerged with a dusty, gaseous envelope that eventually became the planets. However, it cannot explain how the planets and satellites were formed. The time required to form the planets exceeds the age of the solar system.
• M.M. Woolfson's capture theory (sun-star interaction) is a variation of James Jean's near collision theory.
In this scenario, the sun drags from a near proto-star, a filament of material which becomes the planets. Collisions between proto-planets close to the sun produced the terrestrial planets; condensations in the filament produced the giant planets and their satellites. Different ages for the sun and planet is predicted by this theory.
• Noble Prize winnner Harold Urey's compositional studies in meteorites in the 1950s and other scientists work on these objects led to the composition that meteorite constituents have changed very little since the solar system's early history and can give clues about their formation. The currently accepted theory on the origin of the solar system relies much on the information from meteorites.
3) PROTOPLANET HYPOTHESIS (Current Hypothesis) These are the steps or explanation of this theory:
• About 4.6 billion years ago, in the Orion arm of the milky way galaxy, a slowly-rotating gas and dust cloud dominated by hydrogen and helium starts to contract due to gravity.
• As most of the mass move to the center to eventually become a proto-sun, the remaining materials form a disc that will eventually become the planets and momentum is transfered outwards.
• Due to collisions, fragments of dust and solid matter begin sticking to each other to form larger and larger bodies from meter to kilometer in size. These proto-planets arw accretions of frozen water, ammonia, methan silicon, aluminum, iron, and other metals in rock and mineral grains eveloped in hydrogen and helium.
• High-speed collison with large objects destroys much of the mantle of Mercury puts Venus in retrograde rotation.
• Collisions of the Earth with large object produces the moon. This is supported the composition of the moon very similar to the Earth's mantle.
• When the proto-sun is established as a star, its solar wind blasts hydrogen, helium and volatiles from the inner planets to beyond Mars to form the gas giants leaving behind a system we know today.
:) So ayan guys, daming theories no. So sa tingin niyo ba, ano yung mas kapani-paniwalang theory?
