Q: How many stars are there in our galaxy?
A: Our galaxy is about 100 - 300 billion stars and 100,000 light-years diameter.
Earth
Earth is the 3rd planet from the Sun and the 5th largest planet in the solar system. It's about 4.5 billion to 5 billion years old based on radioactive dating of lunar rocks and meteorites, which are thought to have formed at the same time. It is estimated that only 1/8 of the surface of the Earth is suitable for human to live on, 1/3 is covered by oceans and 1/2 of the land is either desert 14%, high mountain 27%. The world's population is 6,804,623,519 as of April 23 2008. Hottest place: Al' Aziziyah, Libya 135.4 F (58 C); Coldest place: Vostok, Antarctica -128.6 F ( -89.2 C)
solar system
The Solar System consists of the Sun and the other celestial objects gravitationally bound to it: the 8 planets, their 166 known moons, three dwarf planets ( Ceres, Pluto and Eris and their 4 known moons) and billions of small bodies. This last category includes asteroids, Kuiper belt objects, comets, meteoroids, and interplanetary dust. The inner terrestrial planets are: Mercury, Venus, Earth and Mars. The outer gas giant ( or jovians ) are: Jupiter, Saturn, Uranus and Neptune. The 3 dwarf planets are: Ceres is the largest object in the asteroid belt, Pluto is the largest known object in the Kupier belt and Eris is the largest known object in the scattered disc.
milky way
The Milky Way galaxy ia a barred spiral galaxy that is part of the Local Group of galaxies. Although the Milky Way is 1 of billions of galaxies in the obserable universe, the galaxy has special significance to humanity as it is the home galaxy of the planet Earth. It is extremely difficult to define the age at which the Millky Way formed, but the age of the oldest star of the Galaxy yet discovered is estimated to be about 13.2 billion years old. The Milk Way galaxy is approximately 100,000 light years in diameter, and is believed to be on average about 1,000 light years thick, It si estimated to contain at least 200 billion to 400 billion stars. The Milky Way has a thickness of around 12,000 light years
Canis Mafor
The Canis Major dwarf galaxy is classified as an irregular galaxy and is now thought to be the closest neighbouring galaxy to our location in the Milky Way, being located about 25,000 light-years away from our Solar System and 42,000 light-years from the Galactic Center. The galaxy was first discovered in November 2003 by an international team of French, Italian, British and Australian astronomers.
universe
The Universe is most commonly defined as everything that physically exists: the entirety of space and time, all forms of matter, energy and momentum and the physical laws and constants that govern them. Astronomical observations indicate that the universe is about 14 billion years old and at least 93 billion light years across. The event that started the Universe is called the Big Bang.
Albert Einstein March 14, 1879 - April 18 1955
Albert Einstein was a German born theoretical physcist. He is best known his theory of relativity and specifically mass-energy equivalence. Einstein recevied the 1921 Nobel Prize in Physics for his services to Theoretical Physics and for his discovery of the law ot the photoelectric effect. He was born in Ulm, Wurttemberg, Germany and died in Princeton, New Jersey, USA. Residence: Germany, Italy, Switzerland, USA. Citizenship: German (1879 - 96, 1914 - 33) Swiss: (1901 - 55 ) USA: ( 1940 - 55) Ethnicity: Ashkenazy Jewish. Fields: Physicist. Notable Awards: Nobel Prize in Physics ( 1921), Copley Medal (1925), Max Planck Medal (1929) and Person of the Century (20th) Signature
Solar System
No comments:
Post a Comment