Is there any way I can tell from Hipparcos catalog which stars are Binary/Multiple Stars and which are Variable stars?
Geology and the Universe The Geological Sciences, Geology or Earth Sciences - as the Anglo-Saxons call it - is the science that studies everything that happens in relation to the rocks that make up our planet. Put more precisely, Geology is the science that studies the Earth, its structure, its composition and the natural phenomena of all kinds that take place on our planet, as well as in its past, through the elements and brands that They have persisted from him on the rocks.
Origin of the Solar System (II) In recent years, some astronomers have proposed that the initiating force in the formation of our Solar System should be the explosion of a supernova. One can imagine that a vast cloud of dust and gas that would already exist, relatively unchanged, for billions of years, would have advanced into the neighborhoods of a star that had just exploded like a supernova.
What will be the end of the Earth? What will happen to the Earth when the sun goes out? For this to happen, there are still 5,000 million years left ... The first to attempt a detailed study of the past and predictably future history of the Earth without resorting to divine intervention was the Scottish geologist James Hutton.
Articles about the Solar System The Sun is a vulgar star, neither large nor small, neither hot nor cold, neither young nor old. It is estimated that his age is 5,000 million years and that many others will continue to shine with the same intensity. When the sun reaches the age of 11,000 million years, it will have depleted all the hydrogen it is using as fuel, and will begin to consume helium in its nuclear reactions.
Seas and oceans of the Earth Who has not ever observed the hypnotic coming and going of the waves in the sea? That huge body of water in movement that separates continents and emergent lands, served sages of Classical Greece to deduce that the Earth was spherical when watching the boats move away and disappear on the horizon.
Types of seas There are different types of seas, according to their location with respect to the continent. They are as follows: - Coastal or coastal sea: They are those that surround different continents. They are not very deep. The Norwegian Sea, the North Sea and the Argentine Sea are of this type. - Continental sea: They are in the same continent and usually have an opening to another sea or ocean, allowing the exchange of marine waters.
Pangea, the whole earth By studying the reliefs in the current emergent lands, their age and the type of fossils contained in the rocks, geologists have been able to know the evolution that the continents have experienced. Thus, about 1,100 million years ago (m.a.) it is believed that all continents were unified into one called Rodinia, which was fragmented about 750 m ago.
Marine foam There are times when some seas seem to be more foamy than others; and is that certain factors combined can cause the waves to reach the beach with little foam, or it seems that we are contemplating the inside of a washing machine. But why does this happen? How different in composition are the marine waters of some seas with respect to those of others?
Salt, gold and waste in the sea The seas and oceans, by their size, have generally been seen as huge dumps in which to throw everything we have left over, trusting that, thus, the problem is solved. And it is not true. It is known that the rain that falls to us usually forms offshore and therefore, if the water is contaminated, this toxic water will rain after dragging all the harmful gases and suspended dust generated in the cities.
How a sea forms Generally, the term sea refers to a mass of salt water that covers a relatively large area of the earth's surface. When we are at the edge of a sea, we cannot help wondering what has happened on the planet so that so much water is accumulated before us.
Waves, how waves form The movement of the salty waters of the seas and oceans is called waves because each of the individual waves is called a wave. Knowing this movement well in advance is sometimes of vital importance. However, due to the amount of factors that affect the waves, such as the strength and directionality of the winds, proximity to the Moon, strength and directionality of the sea currents, the thermal radiation of the sun, ... among others; the movement of the waves on the surface (what is generally known as sea state) is very complex.
Eclipses of Sun and Moon When a celestial body interposes between two others blocking its light, an eclipse occurs. On Earth we have two types: eclipses of the Sun and eclipses of the Moon. Eclipses of the Sun A solar eclipse consists of the total or partial obscuration of the Sun that is observed from a planet by the passage of a satellite, such as the passage of the Moon between the Sun and the Earth.
The beginning of life How did life begin? There is no clear and clear answer, because when life began there was no one there to serve as a witness. But logical analysis of the problem can be done. Astronomers have reached certain conclusions about the general composition of the universe.
Life on Earth This chapter contains a series of articles related to the ways of life on our planet, its origin, its evolution and the conditions for its development. According to the dictionary of the Royal Academy of Exact, Physical and Natural Sciences of Spain, life is defined as: A form of organization of matter characterized by certain physical and chemical processes, whose conjunction allows it to self-organize, perform relationship and reproduction functions, and evolve
Extremophilic life The toughest life known is the invisible life: microorganisms and bacteria. Living beings capable of surviving in extreme conditions are called extremophiles. They survive in conditions that would be lethal to any other way of life. They resist extreme temperatures, above the degree of boiling water and below freezing, acidity conditions, lack of sunlight and oxygen, pressure, salinity ... They can remain dormant for thousands of years and return to revive on contact with water.
Water on the Moon Is there water on the Moon? It is nothing new that scientists have been considering the existence of ice water in the depths of the numerous craters that are distributed throughout the lunar surface. But what has turned out to be a revolution has been the finding (released in August 2013 but made in 2009) that the M3 instrument (Moon Mineralogy Mapper or "Moon mineralogy mapper") of the Indian capsule Chandravaan 1 performed by revealing the presence in tiny water molecules forming part of the composition of certain minerals.
The human genome project The international human genome project is one of the most ambitious scientific projects in the history of science. Only comparable to that of the CERN particle collider. It began in 1998, supervised by James Watson, one of the discoverers of DNA. Scientists of all nationalities collaborate in it.
A life of carbon Carbon is the chemical element that sustains all life on Earth. In nature there are 92 chemical elements in their natural state. That is, 92 different types of atoms. They are the small pieces that combine with each other to form all the known matter. Atoms combine to form molecules, and molecules come together to form matter.
The formation of the oceans At the beginning of the 20th century it was thought that the Earth and the other planets were formed of matter torn from the Sun. And the image of an Earth circulated in a gradual process of cooling, from incandescence to bright red, to pass then at moderate heat and finally at the boiling point of water.