How old can be a star?

Date:

2017-05-03 22:00:07

Views:

2564

Rating:

1Like 0Dislike

Share:

How old can be a star? Source:

If a clean moonless night to go out of town and look at the sky, you can see about three thousand shimmering points. From childhood we are taught that if it doesn't flicker, then it's a planet. If moving, then it's a satellite or a meteor. This tiny scattering of hiding in giant stars for many billions of kilometers from us, some of which are in tens and hundreds times more than our Sun. Our native gas balloon class G2V, too, is the universal community of light. Scientists estimate its age at 4.5 billion years. But the Solar system is relatively young. Where is hiding the most ancient stars?

First, let's learn how stars are born. It is known that empty space is actually not empty, for every two cubic centimeters is found on average in one molecule. First of them formed a sparse, cold cloud of interstellar gas. Gradually, under the action of gravitational instability, it shrinks and takes the shape of a ball. In the compression process, the energy of the gravitational field is converted into heat, and the temperature of the cloud increases. When it reaches the level of 15-20 million degrees, starts the fusion reaction and compression stops. Thus was born a star. Thermonuclear reactions in the core of the star occur millions or even billions of years, providing immediate surroundings an almost inexhaustible flow of energy.

During this inside a star, hydrogen nuclei fuse together forming helium. Then helium is fused into carbon, carbon into oxygen, oxygen into silicon and silicon into iron. The star becomes heavier and creates heavy elements. This continues until, until it again begins to shrink. Small lights — such as red dwarfs are massive enough to synthesize anything other than helium, but still can burn for trillions of years. The destiny of a star is determined by its mass, so at the end of life it turns into a white dwarf, a neutron star (pulsar) or black hole, depending on its "weight category".

The first stars appeared almost immediately after the Big Bang, which scientists believe started everything. But as the age of the Universe is only 13.7 billion years old, and some stars can exist for trillions of years, there should be plenty at any stage of growing up. It's not only to find the old star, but confirm that its maximum age corresponds to the age of the Universe. Astronomy is a complex science that requires perseverance and patience. In the milky Way galaxy over 100 billion stars, and the Universe more than 100 billion galaxies. Multiply these two numbers — and we don't even hundreds of years to cycle through all these lists. It is not surprising that estimates of age of the most ancient balls of gas are constantly changing.

One of the oldest star HD 140283 was discovered over a hundred years ago. If desired, it can be seen with binoculars or an Amateur telescope. Informally it is called "Methuselah" after the oldest person in the Bible who lived 969 years. Star, slightly more massive than the Sun located in the constellation of Libra at a distance of 190 light years from us and belongs to the second generation of stars with low metal content. "Methuselah" has appeared in a few hundred million years after the Big Bang, when the universe was still very, very raw. At first thought that he is 16 billion years old, but it's impossible, because then the egg is older than chicken, which he demolished. For modern assessment 2013 the age of this star is 13.3 billion years.

In the same constellation of Libra, but at a distance of 7500 light-years from us, is a red giant HE 1523-0901. As "Methuselah", is the star of the second generation low metallicity. Discovered in 2007, it quickly earned the title of the oldest in our galaxy, only half a billion years younger than the Universe. The mass of this red survivor is 0.8 solar.

In 2014 a team of astronomers at the Australian national University, exploring the starry sky in the southern hemisphere, said that he had found the oldest known stars. It is 6000 light years from us and, according to preliminary estimates, the age of the universe is 13.7 billion years. Of course, refinement of the analysis will take years, but the fact.

It is possible that one day we will be able to say that I found the oldest star, which appeared immediately after the Big Bang, as soon as it became possible, and remains to this day. Yet we can only sort through these billions of billions of dots that hide behind thousands and millions of light years away, with our best telescopes. Some of those stars died long ago, and only their light continues to inform us of their former existence. Others will live long after the Earth ceases to exist. Is there a reason for a minute to think about the fact that we are only one molecule in a drop of water in the waves of the ocean called the universe?

Recommended

The Americans on the moon: what everyone should know?

The Americans on the moon: what everyone should know?

the Upcoming cosmonautics day is my favorite holiday. It marks the triumph of the human mind: in just four thousand years Homo Sapiens went from hunter-gatherers to space explorers. 12 April 1961 Soviet cosmonaut Yuri Gagarin became the first man in ...

Why are some galaxies spiral shaped?

Why are some galaxies spiral shaped?

you Know what surprised me the most? The fact that we perceive the surrounding world as it is. Animals, plants, the laws of physics and the cosmos are perceived by many people as something so mundane and boring that they invent fairies, ghosts, monst...

Astronomers were able to see the death of another star system

Astronomers were able to see the death of another star system

In the cosmic ocean drifts a lot of mysteries about the existence of which we are unaware. One of these was uncovered five years ago, when astronomers have discovered a lonely star at a distance of 570 light years from Earth, the brightness of which ...

Comments (0)

This article has no comment, be the first!

Add comment

Related News

Frames of solar panels have been successfully tested in space

Frames of solar panels have been successfully tested in space

less than a year ago was the commissioning of a small spacecraft called «Stork-2D». Besides the historical value, this event was unique in that it is «Stork-2D» has been equipped with the latest ultra-light fra...

What can go wrong in space?

What can go wrong in space?

Space is scary. Hard. Despite the fact that have been in space already more than five hundred people, not all of them returned alive. Climb to a height of four hundred miles, to set foot on the moon or conquer another planet — a j...

The tourist spaceship, Virgin Galactic has made another test flight

The tourist spaceship, Virgin Galactic has made another test flight

on Monday passed the next test suborbital spacecraft SpaceShipTwo Unity, developed by the company Virgin Galactic. During a test flight, engineers tested the system, which should help the vehicle to carry out aerodynamic braking w...

Ridley Scott believes in aliens and believes that they can kill all of us

Ridley Scott believes in aliens and believes that they can kill all of us

Ridley Scott for almost 40 years at the helm of kynoselen about the alien killers from outer space. And as it turns out, it's not a coincidence, since Scott believes that similar events with people can happen in reality. In an int...

The first stage of Falcon 9 made a successful landing after the launch of a secret satellite

The first stage of Falcon 9 made a successful landing after the launch of a secret satellite

the Launch took place at 14:15 Moscow time from the cosmodrome on Cape Canaveral. Aboard the rocket was a secret , the purpose of which is kept secret. It is known that the National office of the military space U.S. intelligence h...

#video | the Cosmic beauty, created using the normal color inks

#video | the Cosmic beauty, created using the normal color inks

Using the most common materials at hand from our surroundings, can create such incredible beauty that she will be envied by talented artists and photographers. The guys YouTube channel and Macro Room actively experimenting with ma...

China is discussing with ESA the possibility of building a lunar orbital base

China is discussing with ESA the possibility of building a lunar orbital base

Representatives of China national space administration and European space Agency are currently leading the discussion about the potential cooperation in the construction of the orbital lunar base, as well as possible other joint p...

Houston, we have a problem: NASA ends space suits

Houston, we have a problem: NASA ends space suits

According to the latest audit analysis of the space Agency NASA, a little bit more and the Agency will experience a shortage of space suits. New suits for NASA, which it plans to use for flights into space are in development, but ...

RSC Energia is working on a competitor to the Falcon 9 from SpaceX

RSC Energia is working on a competitor to the Falcon 9 from SpaceX

the Head of RKK «Energy» Vladimir Solntsev said that the Corporation together with other companies working on the creation of new missiles, capable of competing with SpaceX rockets. «RSC «Energy» offers ...

The lack of funding disrupts the timing of the implementation of major projects NASA

The lack of funding disrupts the timing of the implementation of major projects NASA

If you believe that funding problems are relevant only for the Russian space program, are greatly mistaken. The us space Agency NASA has come to the conclusion that a number of its major projects cannot be implemented according to...

SpaceX will send into orbit a spy satellite, U.S. military intelligence

SpaceX will send into orbit a spy satellite, U.S. military intelligence

the Official SpaceX account on Twitter confirmed that the preparation of the next launch of the carrier rocket Falcon 9 is in full swing. The launch will take place on April 30th, this Sunday, but no one knows the exact time. The ...

The first

The first "Martians" from NASA will be very hard

for Years, NASA promises to send people to Mars on their huge new rocket the Space Launch System (SLS) and the new spacecraft "Orion". However, approximately the same amount of time from the Agency could not obtain details about h...

Astronomers: why do we need alpha Centauri, if you can fly to Sirius?

Astronomers: why do we need alpha Centauri, if you can fly to Sirius?

If you are going to run across the galaxy ultra-compact photonic spacecraft able to reach 1/5 the speed of light, then, of course, you need to think about how this apparatus can be stopped when it reaches a set destination. About ...

Russian cosmonauts leave the people

Russian cosmonauts leave the people

Sergei Volkov soon, several experienced Russian cosmonauts will leave the squad training cosmonauts at his own request and for health reasons, according to the Agency TASS citing a source in the rocket and space industry. a few ...

The problem of space debris starts to spiral out of control

The problem of space debris starts to spiral out of control

People is a very irresponsible being. Not enough for them to generate literally mountains of garbage on Earth. You need likewise to dirty the entire orbit of our planet. The European space Agency late last week said that, despite ...

HTC will launch into orbit the first in the history of VR-satellite

HTC will launch into orbit the first in the history of VR-satellite

Virtual reality continues to gain momentum and penetrates into new areas of life. Yes, while this technology is quite expensive and is not without its drawbacks, but sooner or later the inconvenience will be eliminated, and the co...

Singapore has developed a satellite-scavenger

Singapore has developed a satellite-scavenger

Singapore startup Astroscale based Japanese engineers, introduced their version of space garbage, which will help to cope with the growing amount of debris and failed spacecraft in orbit, the Asian Review. within the test missio...

Life on Enceladus: what is it?

Life on Enceladus: what is it?

After the announcement made by the aerospace Agency NASA last week, Saturn's icy moon Enceladus is on everyone's lips. According to the Agency, under-ice ocean of Enceladus discovered molecular hydrogen, which may be an indicator ...

The launch of China's first vehicle was a success

The launch of China's first vehicle was a success

Yesterday the launch of Venician in Hainan province successfully launched a first in the history of China's space truck ("the celestial ship-1"), which will deliver to the space station "Tiangong-2" just over six tons of valuable ...

Manned spacecraft

Manned spacecraft "Soyuz MS-04" successfully docked to the ISS

the Press service of the state Corporation «Roskosmos» reports that the docking of the space ship "Soyuz MS-04" with the International space station was successful. The ship was moored to the module «Search», w...