When we observe a star, is the information we receive from it for the past or the future? Why?
Light is measured in light years, which is the distance light travels in one year. The information we receive to see a star of the past, because he left, traveled some "light years" to get us to see her walking the great distances of space.
For example, a ray of light from the Sun would take 30 000 years to reach the center of our galaxy
Galaxies are huge groups of hundreds or thousands of millions of stars, all gravitationally interacting, and orbiting around a common center. Galaxies contain:
stars planets star clusters
atomic hydrogen
molecular hydrogen complex molecules composed of hydrogen, nitrogen, carbon and silicon and other elements
cosmic rays.
classes of galaxies are: spirals (Sa, Sb, Sc), barred spirals (SBa, SBb, SBc), elliptical (E0 to E7), SO (intermediate between S and E) irregular.
We belong to a spiral galaxy (a Sb) containing obscuring dust and interstellar gas, with many young blue stars in the spiral arms, and old red stars in the core.
instead Ellipticals have little interstellar material, and few young stars. Tend to have sizes of tens of thousands of light years. Their distances are measured by various methods, including Cepheid variable stars. These stars change in brightness in such a way that it is possible to calculate the distance, and hence of the galaxy that contains them. At the core apparently all contain a huge black hole.
Dear teachers: Now we need your help. We assemble a database of stories, novels, comics ... literature in general, relating to astronomy and the universe. We will arm
a catalog of recommendations that can be accessed by all.
We ask you to add a comment here: Name of the work, author, book publisher, and a brief synopsis. If you can add your personal opinion, what age, what part they liked best, etc..
not forget to put your name at the end .. to know who left him . THANKS!
pd: DOUBT, write to escuela15de5@gmail.com
---------------------------------- -------------------------------------------------- ------------ The prince (in French : Le Petit Prince), published on April 6 of 1943, is the story short writer and French aviator Antoine de Saint-Exupéry
In this novel, a pilot Saint-Exupery was what is lost in the desert the Sahara , having had a breakdown in plane. Then a little prince. In their conversations with him, the narrator reveals his own vision of human stupidity and the simple wisdom of children that most people lose when they grow up and become adults .
The story is accompanied by illustrations drawn by the author.
The prince lives in a small planet, the asteroid 612 B, in which there are three volcanoes (two active and one not) and Pink . He spends his days taking care of their planet, and removing baobab trees that are constantly trying to take roots there. Enable them to grow, trees be leaving his planet apart.
one day decides to leave his planet, perhaps tired of the criticisms and complaints rose to explore other worlds. Take advantage of a migration of birds for his accommodation and travel the universe , this is how visit six planets, each inhabited by a character: a king, a conceited, a drunkard, a businessman, a lamplighter and a geographer who, in their own way, show how empty people become when they become adults.
The last character before it, the geographer, recommends traveling to a specific planet, the Earth, where among other experiences just by knowing the aviator, as we mentioned, was lost in the desert.
Jules Verne (1828 1905) and French scritor adventure novels. It is considered a parent d elos science fiction and a visionary scientist, imagined qu eel man reach the moon, which could travel around the world, would meet the center of the Earth ....
On this site you can access your life, thoughts and many of his works:
15 What temperature is estimated to exist in the center of the sun? What
by Daniel and MARIQUENA
The Sun's outer visible layer is called the photosphere and has a temperature of 6,000 ° C (11,000 ° F). This layer has a mottled appearance due to the turbulent eruptions of energy at the surface.
Solar energy is created inside the Sun is where the temperature (15,000,000 ° C; 27,000,000 ° F) and pressure (340 billion times the air pressure on Earth at sea level) are so intense that they carry out nuclear reactions.
The difference in mass is expelled as energy and is brought to the surface of the sun through a process known as convection , which is released as light and heat. The energy generated in the Sun's core takes a million years to reach its surface. Every second turn 700 million tons of hydrogen into helium ashes. In the process, releasing 5 million tons of pure energy at which the sun every time it gets lighter.
The Sun's outer visible layer is called the photosphere and has a temperature of 6,000 ° C (11,000 ° F). This layer has a mottled appearance due to the turbulent eruptions of energy at the surface.
Solar energy is created inside the Sun is where the temperature (15,000,000 ° C; 27,000,000 ° F) and pressure (340 billion times the air pressure on Earth at sea level) are so intense carried out nuclear reactions.
is a lunar eclipse occurs when the moon passes through some part of the Earth's shadow. This happens about twice a year. Not every time the moon passes behind the Earth because moon's orbit is tilted. The Moon can be behind, but usually also above or below our shadow.
By Gonzalo
If light source is the sun, the opaque object is Earth and behind Earth put to the moon, we get a lunar eclipse.
10 How many types of lunar eclipses can be observed? By Gonzalo In the types of eclipse of the moon to be seen is 7 or less, and at least 2. There eclipses each year, seven more than two at least. So why do not we see more? Lunar eclipses are visible only at night. Half of the time occur during the day and only visible from the other side of the Earth.
11 How does a solar eclipse? For Gonzalo
Solar eclipses occur at new moon when the moon passes between the two major stars, blocking out the sun and casting its shadow over Earth .
By Agustina
to the occurrence of a solar eclipse, it is necessary that the Moon is in inferior conjunction (new moon) and also that the Sun is between 18 º 31 'and 15 º 21' one nodes of the lunar orbit
12 How many types of solar eclipses can be observed?
By Gonzalo
solar eclipses are even more elusive because you only see for a few minutes and just inside the area where the shadow falls the Moon. This area is so close that in England have only been visible four total solar eclipses over the last thousand years.
There are three types of solar eclipses. The partial eclipse, the moon eats the sun but not just devour. The day will darken slightly and the sun, seen with any kind of eye protection or a very small hole, like a cookie to which it has taken a bite. In the total eclipse, the face of the sun disappears behind the moon , Flowers usually invisible crown, and the lucky spectators located within the lunar shadow can meet darkness at noon .* The third type of eclipse, the so-called ring, occurs when the Moon is the maximum distance from Earth and therefore looks smaller than usual. Even at the height of this eclipse, the Sun's rim surrounding the moon as well:
By Agustina
There are three types of solar eclipse: Partial : the Moon does not cover the entire solar disk appears as a crescent. Total : from a band (band of totality) on the surface of the Earth, the Moon completely covers the Sun Unsubscribe: occurs when the Moon near the peak and angular diameter is less than solar, so that at the peak ring is visible disk of the Sun This is in the band, outside the eclipse is partial.
The Astronomy is the science that deals with the study of celestial bodies, their movements, phenomena connected with them, recording and investigation of their origin from the information that reaches them through electromagnetic radiation or any other means. Astronomy has been linked to humans since ancient times and all civilizations have had contact with science. People like Aristotle, Ptolemy, Copernicus, Brahe, Kepler, Galileo, Newton, Kant, and Einstein Kirchhoff have been some of his growers.
is one of the few sciences where amateurs can still play an active role, especially in the discovery and monitoring of phenomena and light curves of variable stars, the discovery of asteroids and comets, etc. Do not confuse astronomy with astrology. Although the two fields share a common origin, are very different astronomers follow the scientific method, while astrologers deal with the alleged influence of the stars in the life of men.
Astronomy is divided into four main branches:
v Astronomy position
v Celestial Mechanics
v Astrophysics
v Cosmology .
· Astronomy position. Is to place on the celestial sphere of the stars position measuring angles with respect to certain fundamental planes, using different systems of astronomical coordinates. It is the oldest branch of this science. Describes the motion of the stars, planets, satellites, and phenomena such as eclipses and planetary transits the disk of the Sun also studied the diurnal motion and the annual movement of the sun and stars. Includes description each of the planets, asteroids and satellites of the Solar System. Are fundamental tasks of identifying the same time and determination to navigation geographic coordinates.
· Celestial mechanics. Aims to interpret the movements of the astronomy of position, in the field of physics known as mechanics, usually the Newtonian (Law of Universal Gravitation of Isaac Newton). Study the motion of planets around the Sun, their satellites, calculating the orbits of comets and asteroids. The study of motion of the Moon Earth around its complexity was very important for the development of science.
· Astrophysics. It is a modern part of astronomy that studies the stars and bodies of physics studying the composition, structure and evolution. It was only possible its inception in the nineteenth century thanks to the spectra could determine the physical composition stars. The branches of physics are involved in the study of nuclear physics (energy generation within stars) and the physics of relativity.
· Cosmology. Is the branch of astronomy that studies the origins, structure, evolution and birth of the universe as a whole.
In a specific division are:
· Astrometry. Study of the position of objects in the sky and its change of position. Defines the coordinate system used and the kinematics of objects in our galaxy.
· Astrophysics . Study of physics of the universe, including the properties of astronomical objects (luminosity, density, temperature, chemical composition).
· Cosmology. Study of the origin of the universe and its evolution. The study of cosmology is the ultimate expression of theoretical astrophysics.
· Formation and evolution of galaxies . Study galaxy formation and evolution.
· galactic astronomy. Study of the structure and components of our galaxy and others.
· extragalactic astronomy. Study of objects outside the Milky Way.
· stellar astronomy. Study of star birth, evolution and death.
· Stellar Evolution. Study of the evolution of stars from their formation to his death as an outcast star.
· star formation. Study of conditions and processes leading to star formation within clouds of gas.
· Planetary Science. Study of the Solar System planets and extrasolar planets.
· Astrobiology. Study of the emergence and evolution of biological systems in the universe.
