theories of origin of earth


http://liftoff.msfc.nasa.gov/academy/space/atmosphere.html, "The Earth's Layers." Even today volcanic activity, especially at the midocean ridges, releases large amounts of carbon dioxide, water vapor, and other gases into the atmosphere. While religions have relied on creation stories to explain how life on Earth began, scientists have tried to hypothesize possible ways that inorganic molecules (the building blocks of life) joined together to form living cells. In fact, all of the galaxies (clusters of billions of stars) are moving away from our own Milky Way Galaxy and from one another, and the farther away they are the faster they are moving away from us. In the outer solar nebula temperatures were cool enough for the abundant gases to accumulate and be held by proto-planets. "Ocean and Climate." - birth. Most stars smaller than our sun will slowly cool and fade. The star's core cools and begins to contract again. Space.com, April 7, 2004. http://www.space.com/scienceastronomy/earth_poles_040407.html, "The Carbon Cycle." Most of the gas and finest particles were swept from the solar system leaving only the proto-planets and asteroids. The history of Earth concerns the development of planet Earth from its formation to the present day. The "thermonuclear fires" are lit; a star is born! Only refractory (high melting point) materials like iron and rocky silicates were stable, so the terrestrial planets are made primarily of metallic cores and silicate mantles with atmospheres thin or absent. Matter collapses. The most prominent scientific theory about the origin of the Earth involves a spinning cloud of dust called a solar nebula. Due to gravitational pull a gaseous tide was raised on the surface of the sun. The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to about 4.4 Ga, soon after the formation of the Earth's crust and the Earth itself. This nuclear reaction releases huge amount of energy. We do, however, have theories which help us understand how the birth of the universe may have occurred. In very high mass stars (20 - 100 times the size of our sun), the mass, and therefore gravity is so great that when it goes into its late contraction phase the pressure in the interior is so great that matter cannot withstand it. 1994. He postulated that if life arose in a ‘warm little pond’ then it would rapidly run out of food. A nebula (gas cloud) slowly contracts under the mutual gravity of all of the atoms in the cloud. USA Today, August 6, 2004. The Origin Of Universe Earth And Life Science. NASA Earth Observatory. This secondary contraction increases the pressure and temperature of the star's core. Gases in the mantle prefer to go into any melt that forms and happily escape into the atmosphere if the melt erupts at the surface. The cloud was made largely of hydrogen (H) with some helium (He) and small amounts of the remaining naturally occurring chemical elements. The origins of life cannot be dated as precisely, but there is evidence that bacteria-like organisms lived on Earth 3.5 billion years ago, and they may have existed even earlier, when the first solid crust formed, almost 4 billion years ago. Fact Sheet 2005-3024, U.S. Geological Survey. http://pubs.usgs.gov/gip/ice_age/, Hawkes, Nigel. This is exactly like a gigantic explosion. "Moon Mechanics: What Really Makes Our World Go 'Round." "Solar Wind to Shield Earth During Flip." Matter collected in smaller clumps out in the disc. "Understanding Global Climate Patterns." Simkin, Tom, et al. Information about the device's operating system, Information about other identifiers assigned to the device, The IP address from which the device accesses a client's website or mobile application, Information about the user's activity on that device, including web pages and mobile apps visited or used, Information about the geographic location of the device when it accesses a website or mobile application. "Why Are there Ice Ages?" This outgassing formed the oceans and the primitive reducing atmosphere. The Big Bang Theory is the most accepted theory regarding the origin of the planet earth and the existence of different life forms on it. Eventually the pressures and temperatures in the core of the proto-sun became great enough that hydrogen nuclei fused together to form helium. You consent to our cookies if you continue to use our website. Honestly, it’s a mystery. According to this theory, the universe originated in an enormous explosion. December 15, 2005. http://news.nationalgeographic.com/news/2005/12/1215_051215_north_pole.html, "What Is Photosynthesis?" "Global Warming and Our Changing Climate." The origin of life on Earth is a highly curious thing. The solar nebula got hotter as the contraction increased the pressure, especially in the inner nebula. Nearly all branches of natural science have contributed to understanding of the main events of Earth's past, characterized by constant geological change and biological evolution.. Could reversing global warming start an ice age? What Are Some Theories That Explain The Origin Of Earth Quora. http://earthobservatory.nasa.gov. NASA Earth Observatory. Origin of the Universe - The Big Bang Theory Within the disc, the largest concentration of matter was in the center. Primitive Earth. Contraction causes the pressure to increase which causes the cloud to heat up. Eventually the star fuses so much H into He that the H concentration in the core is reduced and the thermonuclear reactions becomes sluggish. Volatile materials, carried by certain types of meteors and by comets, were injected into the mantle by impacts that penetrated the interior. Gaseous Tidal Theory. Revised Nebular Hypothesis. USGS. Space.com, March 18, 2003. http://www.space.com/scienceastronomy/moon_mechanics_0303018.html, Britt, Robert Roy. Smith, Lewis and Ben Hoyle. Perhaps life didn’t start on Earth at all. But due to gradual cooling, the gases condensed into molten core and different elements got stratified according to their density. The proto-sun and proto-planets grew by accretion of the matter that was falling in toward the center of mass. The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. "Waterworld: How will Life on Earth Look in 1000 Years." As a result the Jovian planets (Jupiter, Saturn, Uranus, and Neptune) are gas giants, made mostly from hydrogen, helium, and hydrogen compounds like ammonia and methane. U.S. Geological Survey. Panspermia. Perhaps it was seeded across the solar system … "World Has Only 20 Years to Stop Climate Disaster." the Earth's surface, but the study of the ocean floors, and the interior of the Earth. Soon the pressure and temperature are so great that the nuclei of hydrogen atoms begin to fuse together to form helium. Large star came near the sun. Digging even deeper than the deep-sea vents, Thomas Gold proposed a theory in the 1970s that life might have arisen far below the planet’s surface, based on a continuous supply of primordial methane from the Earth’s mantle. The energy release yields an outward pressure and the gravitational contraction stops. http://www.pbs.org/wgbh/nova/ice/, "Earth's Atmosphere." http://earthobservatory.nasa.gov/Library/CarbonCycle/, Chown, Marcus. Philosophers, religious scholars and scientists have lots of ideas about where the universe came from, but the most widely-held scientific theory is the Big Bang Theory. Ppt Age And Origin Of The Earth Powerpoint Ation. According to this theory, the universe is a result of a massive explosion which occurred 20 billion years ago. According to this theory life was created by supernatural power. The core of the nebula, the proto-star, heats up the most and starts to glow red hot. The universe was filled with hydrogen (H) and small amounts of helium (He). Theories of Origin of Life. "North Magnetic Pole is Shifting Rapidly Toward Russia." There are two fundamental theories regarding the formation of the solar system, Nebular Hypothesis or Gas Collapse and the Accretion Disk Model. A nebula (gas cloud) slowly contracts under the mutual gravity of all of the atoms in the … In the beginning, it was a spinning ball of hot gases and vapours of elements. In the standard theory, space and time and all the matter and energy in the universe were formed in the Big Bang some 10 to 15 billion years ago. Gaseous tide detached when star move away. Theory of Special Creation: The greatest supporter of this theory was Father Suarez. The Origin Of Life On Earth Theories And Explanations. Today this convection is tied to seafloor spreading and hotspots. As the star came nearer, the tide increased in size. The hot early Earth cooled in much the same way as the Earth's interior cools today - by convection. If we stop global warming, will the polar caps refreeze? United States EPA, April 2000. The initial rotation or tumbling motion was accelerated as the nebula contracted, like a spinning skater who pulls in his arms spins faster. NASA. As per these theories, the sun had a companion. These early organisms must have been simpler than the … http://earthobservatory.nasa.gov/Library/OceanClimate/, Illinois State Museum. In fact, many scientists have dedicated their entire lives to finding out how life came to be on Earth. The remaining 10% of its mass remains as a neutron star. Jeans and Jeffrey proposed the theory in 1925.

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