The birth of the first stars

It is believed that the first stars in the universe formed a few hundred million years after the Big Bang, 13.7 billion years ago.

It is believed that the first stars in the universe formed a few hundred million years after the Big Bang, 13.7 billion years ago. They are heated up and ionized ancient intergalactic space. And their supernova explosions enriched the primordial gas to the first heavy elements. The universe was born only with the help of hydrogen and helium breath.

These stars are so changing chemical and thermal state of the gas from which emerged the first galaxies, causing the first self-sustaining cycle of star formation and chemical enrichment. Understanding the formation and properties of the first stars is an important step forward in the establishment of a general picture of the structural creation of the early universe.

The first stars have yet to be directly observed. They are faded, although future space missions and giant telescopes hoping to spot them. Meanwhile, theorists who deal with them have relied for decades on the basic physical concepts and computer simulations. The current model of hydrogen, dark matter and gravity, form a large structure in the center of which form molecular hydrogen gas.

Molecular hydrogen can then radiates and cools the structure, allowing them to further collapse and heated until the stars are not born. The last stage of this process is fast and within a small amount compared with the entire structure, which is the main problem to monitor events via the budget. As a result, there are large uncertainties (for example, how fragmentation in the last phase affects the weight of future stars?).

Astronomer Center for Astrophysics Harvard Smithsonian, Grif Tomas and his colleagues have developed a new algorithm that computer can follow the process of star birth in a small scale. With the help of it, enabled them to follow the development of fibrous substructure and medium sized clumps of wide only a few astronomical units. One astronomical unit is the average Earth from the Sun Distance from sea and to monitor whether its star form or recombined.

They also can estimate when such fragmentation occurs. The new results suggest that not all struct fragment in the initial stage of collapse. They can be stabilized in the transitional period, or later collapse, which means that before the estimated time period for the formation of the first stars could be longer than expected.

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