How life on Earth form? If you had previously discussed the seed of life on Earth ie amino acids, taken by CR Chondrites from meteorit space. In fact, there is new news that the explosion of life on Earth occurred after the rain falling more than 400 million years ago. At that time, although the Earth with more than 100 meteorit size of 1 km in a very short time, the life not only can be saved but it is growing.
Rangkaian meteorit collision occurred during the Ordovician period, between 490 - 440 million years ago. Indeed, life is not life as we know now, but at that time already living creatures on land and the organisms have also evolved to be able to start living in a niche in the sea. It seems that the irregularity in the asteroid belt 470 million years lalulah that send hundreds of rock out of the spacecraft orbit normal to the Earth.
Destruction of large-scale meteorit by large-scale destruction by meteorit
After several million years, more than 100 large meteorit that have been fragmentary and the Earth, sun and pack in the dust. Plants that hungry akan Sun akahirnya chain of life and death that are dependent on plants, also dropped out. But it is surprising, life is growing rapidly after a period. Grow and evolve into a new and more interesting.
The researchers from the University of Copenhagen and Lund University, together collecting chemical samples from meteorit, fossil, and also learn some crater in Sweden. Lockne crater is a crater which was also examined, located in northern Sweden with a diameter of 75 km. Research conducted shows that there is evidence that life evolved on more layers than a new layer containing the remaining meteorit attack.
The period after the destruction of a large-scale. The period after the destruction of a large-scale.
With the explosion of life, biological evolution can be great assistance in the relatively short time. Sample cases, volcanic eruptions or large forest fires, the initial damage will take effect on a very large life. But from abunya appear more rich fauna of the previous.
Earlier this year, paleontologis states that life can be re-appear quickly after the incident with the destruction of a large-scale, but needed a long time to be able to restore the diversity of life. Therefore, after most of the life tersapu by asteroid, kecoa, roach and berkerat animals such as rats that took over. But it takes several years before the ecosystem can return wealth to the butterfly, giraffe, or the other.
Source: Universe Today, Nature geoscience
Sabtu, 16 Mei 2009
That life can form in Cool Stars?
Origin of life has always been an interesting study. Well, Earth is believed in life comes from the chemical soup hot. Questions then appear, whether the samajuga have soup on the planet that orbit other stars?
Studies conducted Spitzer telescopes owned by NASA showed that the stars orbit planet yanng cold (more cool from Sun) may have the potential life of a different maker. Estimated to mix different chemicals that are required with the Earth.
Artist impression to the young planet mengorbit the cold stars. Credit: NASA
Artist impression to the young planet mengorbit the cold stars. Credit: NASA
Astronom using the Spitzer telescope to search for prebiotik chemical compound that is known by the name of hydrogen cyanide, in the material forming planet around the star that is the different types. Hydrogen cyanide composed by adenin who also is a basic element forming DNA is in all living organisms on Earth.
Researchers successfully detect the presence of molecular hydrogen cyanide in the disk around the star like sun yellow, but they can not find the same components on the stars a more cold and small as in the M dwarf stars are colored kemerah-meraha and the brown dwarf.
Can be prebiotik different chemical compound on the planet is cold mengorbit stars. Young stars born dlam cocoon of dust and gas, which then become memipih plate. Dust and gas in the disc is what provides the raw material forming the planet. Suspected, forming molecules in the embryo of life form on Earth's disc. Prebiotik molecules such as adenine allegedly taken from space to Earth when the Earth surface meteorit menghatam while still young.
Nah, mungkinkan form of life around other stars? Ilaria Pascucci of the Johns Hopkins University, Baltimore, Md and their colleagues try to find the answer to the examine the disc where the planet terbentuknya around 17 stars and 44 cool stars like sun. They use the property Spitzer infrared spectrograph to separate the light and reveal the existence of the chemical compound. Age of the stars examined in the range of 1 - 3 million years, where the age of stars is estimated to have grown. In this research, which is seen perbadingan molecular hydrogen cyanide with the acetylene molecule.
Result, the M-dwarf stars and brown dwarf is not indicated the existence of hydrogen cyanide while 30% of stars similar Sun showed the existence of the molecule would have. According to Pascucci, ultraviolet light is stronger in stars like the Sun controls the formation of the high hydrogen cyanide. But the stars are cold moleuk acetylene found around stars in the disc.
These provide clear implications on the planet at this time have been found around the M-dwarf bintag. Some of the planet is found that greater than Earth, and is known as a super-Earth planet. Of all the super-Earth planet found that none are on the area habitasi stars, where water is in liquid condition. The question if there is a super-Earth planet discovered in the area habitasi Stars, he has mampukah and sustain life?
The astronom still has not been able to answer that meberi.
M-dwarf explosion has extreme magnetic process that can disrupt the formation of life. Research data to give Spitzer another story for consideration, namely the planet-the planet is also lack of hydrogen cyanide, molecules in the form of life.
So far the researchers have the condition that the aam stars akan cold would provide for the emerging challenges of life. But the Spitzer would build sbeuah other fundamental questions, namely: "What keplanetan system in the cold stars have enough material to form life?"
If the answer is not, the question about life in the cold stars can be a new aspect of the debate is interesting.
Source: NASA JPL
Studies conducted Spitzer telescopes owned by NASA showed that the stars orbit planet yanng cold (more cool from Sun) may have the potential life of a different maker. Estimated to mix different chemicals that are required with the Earth.
Artist impression to the young planet mengorbit the cold stars. Credit: NASA
Artist impression to the young planet mengorbit the cold stars. Credit: NASA
Astronom using the Spitzer telescope to search for prebiotik chemical compound that is known by the name of hydrogen cyanide, in the material forming planet around the star that is the different types. Hydrogen cyanide composed by adenin who also is a basic element forming DNA is in all living organisms on Earth.
Researchers successfully detect the presence of molecular hydrogen cyanide in the disk around the star like sun yellow, but they can not find the same components on the stars a more cold and small as in the M dwarf stars are colored kemerah-meraha and the brown dwarf.
Can be prebiotik different chemical compound on the planet is cold mengorbit stars. Young stars born dlam cocoon of dust and gas, which then become memipih plate. Dust and gas in the disc is what provides the raw material forming the planet. Suspected, forming molecules in the embryo of life form on Earth's disc. Prebiotik molecules such as adenine allegedly taken from space to Earth when the Earth surface meteorit menghatam while still young.
Nah, mungkinkan form of life around other stars? Ilaria Pascucci of the Johns Hopkins University, Baltimore, Md and their colleagues try to find the answer to the examine the disc where the planet terbentuknya around 17 stars and 44 cool stars like sun. They use the property Spitzer infrared spectrograph to separate the light and reveal the existence of the chemical compound. Age of the stars examined in the range of 1 - 3 million years, where the age of stars is estimated to have grown. In this research, which is seen perbadingan molecular hydrogen cyanide with the acetylene molecule.
Result, the M-dwarf stars and brown dwarf is not indicated the existence of hydrogen cyanide while 30% of stars similar Sun showed the existence of the molecule would have. According to Pascucci, ultraviolet light is stronger in stars like the Sun controls the formation of the high hydrogen cyanide. But the stars are cold moleuk acetylene found around stars in the disc.
These provide clear implications on the planet at this time have been found around the M-dwarf bintag. Some of the planet is found that greater than Earth, and is known as a super-Earth planet. Of all the super-Earth planet found that none are on the area habitasi stars, where water is in liquid condition. The question if there is a super-Earth planet discovered in the area habitasi Stars, he has mampukah and sustain life?
The astronom still has not been able to answer that meberi.
M-dwarf explosion has extreme magnetic process that can disrupt the formation of life. Research data to give Spitzer another story for consideration, namely the planet-the planet is also lack of hydrogen cyanide, molecules in the form of life.
So far the researchers have the condition that the aam stars akan cold would provide for the emerging challenges of life. But the Spitzer would build sbeuah other fundamental questions, namely: "What keplanetan system in the cold stars have enough material to form life?"
If the answer is not, the question about life in the cold stars can be a new aspect of the debate is interesting.
Source: NASA JPL
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