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La teoria del big bang y la formacion del Universo
La teoria del big bang y la formacion del Universo

... development of the universe. • The key idea is that the universe is expanding. Consequently, the universe was denser and hotter in the past. Moreover, the Big Bang model suggests that at some moment all matter in the universe was contained in a single point, which is considered the beginning of the ...
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... • Astronomers think that most of the stars in the Milky Way galaxy could also have planets orbiting around them. These are called “extra-solar planets”. ...
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Dark Matter and Dark Energy
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... • It is now known that the elements observed in the Universe were created in either one of two ways. – Light elements (namely deuterium, helium, and lithium) were produced in the first few minutes of the Big Bang. – Elements heavier than helium are thought to have their origins in the interiors of s ...
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What is a Scientist? - Cockeysville Middle School

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... The solar system consists of the sun and a collection of objects, including planets, their moons, and asteroids that are held in orbit around the sun by its gravitational pull on them. (MS-ESS1-2), (MSESS1-3) The model of the solar system can explain eclipses of the sun and the moon. Earth’s spin ax ...
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... Tertiary periods. This event may have been ultimately responsible for the mass ex­ tinction of dinosaurs and many other species 65 million years ago. Through videos or classroom demonstrations, teachers can introduce simula­ tions of impacts of asteroids. Teachers can model cratering by carefully th ...
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... Milky Way satellites. In the constellation of Virgo, they found such a clump. It’s unlikely to be a random fluctuation in the distribution of Milky Way stars masquerading as a physical clump; it’s better than 99% certain to be an actual object. To make sure, the astronomers did something clever. In ...
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What Is the Solar System? / Why Does the Sun Appear to Move

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... We could live in an infinite universe. No one yet knows the true size of our universe. Our view is limited not by a physical edge to space, but by how far light has traveled since the time our universe was born. The observable universe is just a portion of the whole. Many people, adults and students ...
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Outer space



Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation from the Big Bang, is 2.7 kelvin (K). Plasma with a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is high.
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