2. A constellation, in astronomy, is a conventional cluster of stars. In the sky we see
stars, nebulae, clusters ... that belong to a particular constellation. Of the 88
constellations of the sky, the best known are the twelve Zodiac, each
representing an animal. Besides these, Ptolemy recognized 48 constellations
made up of over 1,000 stars in the second century. C. Much later, in 1925 last
century internationally established the 88 constellations we know today: 48
correspond to the observations of Ptolemy and the other to the discoveries of
the modern era. It is customary to divide constellations into two groups,
depending on where they are celestial hemisphere:
northern constellations, located north of the celestial Ecuador
southern constellations, to the south. The stars that can be seen on a clear
night are certain figures we call "constellations", and used to more easily
locate the position of the stars. Astronomers believe the Milky Way center is
located in the constellation of Sagittarius. The zodiac is a band of sky where
apparently transiting the Sun and planets. During the V century a. C., the
region was divided into 12 equal parts (one for each month of the year) to
which they gave the name of the nearest constellation (groups that might well
have existed before the invention of the Zodiac itself).
http://www.youtube.com/watch?v=IwRIu76TY-k
3.
4.
A team of astronomers has discovered 50 new exoplanets (planets do not
revolve around the Sun), among which 16 are Earth-like planets. One of them
orbit within the limits of the habitable zone of its star, which could contain
liquid water. This finding has been possible thanks to harps planet search
system of the European Organization for Astronomical Research in the
Southern Hemisphere. After two years of work, the team of researchers has
discovered five new planets with mass that can exceed five times the size of
Earth. One of these planets discovered, called HD 85512 b, has a mass of only
3.6 times that of Earth and is in an area that would allow the presence of
liquid water if conditions are appropriate. Scientists at the University of
Central Florida have discovered a new planet outside our solar system. The
planet called ufc1.01 an exoplanet orbiting the red star called Gj436 is about
two thirds the size of the earth at a distance of only 33 light-years, cosmically
speaking is just around the corner as the discoverer Kevin Stevenson although
this is a distance of 194 billion miles. Possibly is the closest planet to our solar
system, and is smaller than our planet earth. The diameter of the planet is
approximately 5.200 miles or two thirds of the land, revolves tightly around
GJ 436, about seven times the distance of the earth from the moon. Its year
lasts only 1.4 days of planet earth,
5.
6.
According to a new study finally galaxies have been detected a strange
and dark, almost sinestrellasa eleven billion light years away.
Astronomers have discovered an unexpected group of spiral galaxies
appear to have formed recently, long after the initial period of the history
of the universe in which it is thought to have formed the majority of
galaxies. These girls are big and bright galaxies like our own Milky Way.
The dominant hypothesis of galaxy formation holds that these shapely
spirals were formed about 13 billion years ago, shortly after the Big Bang.
But the new discovery of a group of 15 spirals that seem much younger
can debunk that idea.
Although they are so bright and big as normal spirals, these galaxies
appear to be the hallmark of youth. They lack almost half of heavy
elements, called metals, which would be expected in older galaxies. But
the abundance of chemical compounds in newly discovered galaxies
suggests that they have approximately 3 to 4 billion years.
7.
8. An eclipse is the obscuration of one celestial body by another. As the
heavenly bodies are not standing still in the sky, sometimes you
project the shade cover to the other, so that the latter is dark. In
the case of Earth, the Moon and the Sun have two modes: solar
eclipses, which consist of darkening of the Sun as seen from Earth,
because of the shadow that the Moon casts, and lunar eclipses,
which are darkening of the Moon as seen from Earth, because it is
located in the shadow cast by the Earth. Solar eclipse occurs only
on a small strip of land, because the moon, by its smaller size,
does not completely hide the sun for the whole earth. Lunar
eclipses can be of two types: Total: when in the shadow cone of
the Earth, and partial: when only partially inserted in the shade.
