The Earth, the Sun, the Milky Way and the Universe
According to the most accepted cosmological theories, the universe emerged with the Big Bang (big bang ) some 13,700 million years.
The Universe exist billions of galaxies .
Each galaxy consists of billions of stars .
Our galaxy, The Milky , has an antiquity of 10,000 million years.
forms a spiral with a diameter of 130,000 light years.
is estimated to contain about 100,000 million stars that revolve around his middle. The
Sol, located 30,000 light years from the center, move along / in / with the Milky Way, a speed of 200 km per second.
Age of the Sun: 5,000 million years.
The solar system, in addition to the 8 planets classics: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune has another 4-5 dwarf planets: Pluto-Charon, Ceres , Eris and Sedna as well as 170 satellites known to date ( Earth 1, Mars 2, Jupiter 63, Saturn 60, Uranus 27, Neptune 13, Pluto and Eris 3 1 ), Also has about 30,000 and numerous asteroids comets and meteorites .
According to the laws of Kepler, the planets move in elliptical orbits , one of whose foci is the sun, at certain times of the planet is about it ( perihelion), others away (aphelion ), the planet moves faster at perihelion than at aphelion.
Sol Composition: H 70-80% I 20-25%, 2-3% other elements ( contains 98% of all matter in the Solar System )
Your diameter of 1,390 is 000 km, its size is 109 times that of Earth and its volume
1,300,000 times greater severity
Your is 28 times the Earth's temperature
Your is about 15,000,000 ° C. ( in the inner core) and about 6,000 G º C. (on the outside)
The heat and glare of the sun, as in other stars, are caused by large thermonuclear reactions that occur inside, every second is consuming millions of tons of hydrogen, releasing energy, light and heat
Age of Earth : 4,600 million years.
Distance between Earth and the Sun: 149,600 million miles.
Earth orbits the Sun at a speed of 29.8 km / s.
This year-long orbit.
Land Diameter: 12,800 km Period
rotation on its axis: 23h 56 '4''
axis inclination: 23.45 °
geological composition: the core ( of about 2,500 km in diameter ) is Fe and Ni, the crust and mantle rocks are composed of silica (SiO2) and other elements.
average surface temperature: 17 ° C (50 º C maximum -70 º C and minimum )
mantle temperature ranges from 100 ° C, with the crust, rising gradually to 3,500 ° C, near the nucleus, and reaches 5000-6000 ° C inside.
Composition of Earth's atmosphere: N 78%, O 21%, H20, CO2, Ar and others.
The water (H2O) covers 70 percent of the planet's surface but represents only 0.022% of its mass and 97% are seas and oceans (saltwater )
From space the Earth seen as a planet blue color
The distances between galaxies, stars and other bodies of the universe - in continuous and rapid expansion - and even among the planets of our solar system are enormous scale one could argue that space is nearly empty .
example suffices to say that the next star to our sun is Proxima Centauri in the Alpha Centauri system, is at a distance of 4.2 years = 37 billion light-Km and the nearest galaxy to ours - Milky Way - the Andromeda Galaxy located a million light years.
While the stars reach high temperatures the immense empty, dark space where stellar radiation fail, remains constantly in frigid -270 º C. ----------------------------------------------
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Photographs of the universe (astronomia.com)
Solar System planets (primatecuasisapiens.blogspot)
To expand and view images (images.google.es)
The universe around us (diariodeclase.nireblog.com)
What is the Universe? - Interesting videos about the theories of Stephen Hawking and other cosmologists and scientists (www.soygik.com)
Theories Big Bang and expanding universe (es.wikipedia.org)
Y view this magnificent collection of color photographs and videos of sun, planets, galaxies and other celestial bodies (observatorio.info)
How long can the sun keep life on Earth? (www.taringa.net)
Videos on the Sun, Star and Universe (www.youtube.com) ------------------------------------
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