Two main types of star clusters can be distinguished: globular clusters are tight groups of ten thousand to millions of old stars which are gravitationally bound, while open clusters are more loosely clustered groups of stars, generally containing fewer than a few hundred members, and are often very young.
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Answer. Answer: A binary star is a star system consisting of two stars orbiting around their common barycenter. Systems of two or more stars are called multiple star systems.
A star cluster is a group of stars that share a common origin and are gravitationally bound for some length of time. They are are particularly useful to astronomers as they provide a way to study and model stellar evolution and ages.
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Which statement accurately describes binary star systems? They have stars that might appear to wobble.
Stars in a star cluster all have approximately the same age! More massive stars evolve more quickly than less massive ones. If you put all the stars of a star cluster on a HR diagram, the most massive stars (upper left) will be missing! the turn-off point, the older the cluster.
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Essentially, astronomers determine the age of stars by observing their spectrum, luminosity and motion through space. They use this information to get a star’s profile, and then they compare the star to models that show what stars should look like at various points of their evolution.
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How do astronomers know that globular clusters are old? There are no massive main-sequence O and B stars in globular clusters. giants and supergiants.
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Bok globules are found within H II regions, and typically have a mass of about 2 to 50 solar masses contained within a region about a light year or so across (about 4.5×1047 m3). They contain molecular hydrogen (H2), carbon oxides and helium, and around 1% (by mass) silicate dust.
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But if the body has sufficient mass, the collapsing gas and dust burns hotter, eventually reaching temperatures sufficient to fuse hydrogen into helium. The star turns on and becomes a main sequence star, powered by hydrogen fusion.
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Explanation: Reflection nebulae reflect light from a nearby star. Many small carbon grains in the nebula reflect the light. The blue color typical of reflection nebula is caused by blue light being more efficiently scattered by the carbon dust than red light.
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This process occurs on the free fall timescale , which is roughly 100,000 years for solar-mass protostars, and ends when the protostar reaches approximately 4000 K. This is known as the Hayashi boundary, and at this point, the protostar is on the Hayashi track.
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The variable star T Tauri was discovered on an October night in 1852 by John Russell Hind. Hind, a noted asteroid hunter, is credited with having discovered 11 minor planets, as well as Nova Ophiuchi 1848 and R Leporis (also known as Hind’s Crimson Star).
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Stage 4 of star formation is when the object can exhibit violent surface activity producing extremely strong protostellar winds. This phase is also called the: T Tauri phase.
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Shock waves traveling through the ISM, the interstellar medium, can cause some areas of the molecular cloud to compress into very high densities, high enough to form stars. When molecular clouds collapse as a result of shock waves, they fragment.
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Stars are usually classified by the types of absorption lines found in their visible spectra; the relative strength of different absorption lines provide clues to a star’s temperature, surface gravity, luminosity and mass.
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What are the characteristics of an open cluster of stars? Rotation of the protostar helps generate the magnetic fields and bipolar flows. in clusters in the Galaxy’s spiral arms. Stars live too long to be observed from birth to death.
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-open clusters: stars in this cluster are not gravitationally bound, and will drift away from each other over time. the result of massive star forming in the spiral arms when a giant molecular cloud collapsed. They are very young and contain, hot white and blue stars.
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Noting the turnoff mass in a star cluster allows you to determine its: age.
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Examples of star clusters are the Great Cluster (M13) in the constellation of Hercules and some of the stars in the Pleiades. M13 is a globular cluster and the Pleiades an open cluster. However a constellation is a group of stars that appear to be related simply because of the view of them from the Earth.
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Star clusters and galaxies both contain stars bound together by gravity, but while the members of a star cluster are thought to form simultaneously from a collapsing ball of gas, galaxies have richer histories.
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Star Clusters are at the same distance, so it is easy to measure their relative Luminosities, have the same age, have the same chemical composition, have a wide range of stellar masses.
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The Pleiades are an example of an open star cluster ” a group of stars that were all born around the same time from a gigantic cloud of gas and dust. The brightest stars in the formation glow a hot blue and formed within the last 100 million years.
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Star clusters offer astronomers a very effective way of studying the effects of stellar evolution. A star cluster is group of stars that were formed at the same time and from the same cloud of gas and dust. All stars in a cluster are therefore of nearly the same age and composition.
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The two types are open (formerly called galactic) clusters and globular clusters.
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Stars appear brighter ” this sentence accurately describes star clusters. There are different models for estimating the number of stars in the Milky Way and starts appear brighter as the large starts and the whole assemblage of them can only be seen from earth.
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Which of these is the best description of the orbital motion of a binary star system? Both stars orbit around a common center of mass. For simplicity’s sake, though, orbits are often plotted as the path of the secondary star with respect to the primary.
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Stars are made of very hot gas. This gas is mostly hydrogen and helium, which are the two lightest elements. Stars shine by burning hydrogen into helium in their cores, and later in their lives create heavier elements.
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4. Star clusters can be used to study star formation in distant galaxies. Its easy to study star formation in our own galaxy, the Milky Way, because we can observe stars forming deep within molecular clouds and the young stars that have recently formed.
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Star Clusters. When stars are born they develop from large clouds of molecular gas. This means that they form in groups or clusters, since molecular clouds are composed of hundreds of solar masses of material. After the remnant gas is heated and blow away, the stars collect together by gravity.
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A globular cluster is a spherical collection of stars. Globular clusters are very tightly bound by gravity, with a high concentration of stars towards their centers. Their name is derived from Latin globulus”a small sphere. Globular clusters are occasionally known simply as globulars.
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Astronomers classify stars according to their physical characteristics. Characteristics used to classify stars include color, temperature, size, composition, and brightness.
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the general shape of the star system. the age of the stars in the system. the way stars are organized in the system. the color of stars in the system.
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A light-year is the distance a beam of light travels in a single Earth year, which equates to approximately 6 trillion miles (9.7 trillion kilometers).
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Scientists claimed to have found a well-preserved fossil of a dinosaur leg touted to be from the time asteroid hit the Earth. The limb of Thescelosaurus, covered with skin, was found at a fossil site in Tanis, North Dakota, 3,000kms away from the asteroid impact site in the Gulf of Mexico.
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It’s extremely rare to find a complete skeleton of a dinosaur. It’s rarer still that such a skeleton needs to be found twice. Such is the fate of “Stan” the T. rex, a massive, mostly complete skeleton of one of the most legendary species of dinosaurs known to Earth.
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It was big news indeed last year when Schweitzer announced she had discovered blood vessels and structures that looked like whole cells inside that T. rex bone“the first observation of its kind. The finding amazed colleagues, who had never imagined that even a trace of still-soft dinosaur tissue could survive.
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In the two centuries since the first dinosaur bones were identified in England, nearly 11,000 dinosaur fossils have been unearthed worldwide, two thirds of them in North America and Europe.
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The first skeleton of Tyrannosaurus rex was discovered in 1902 in Hell Creek, Montana, by the Museum’s famous fossil hunter Barnum Brown. Six years later, Brown discovered a nearly complete T. rex skeleton at Big Dry Creek, Montana.
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The T. rex had to look absolutely real, the palaeos and vet involved with the autopsy were not to be actors, so the creature had to believable to them and stimulate their reactions as they delved deeper and deeper into the mystery of the beast.
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The answer is YES. In fact they will return to the face of the earth in 2050. We found a pregnant T. rex fossil and had DNA in it this is rare and this helps scientists take a step closer of animal cloning a Tyrannosaurus rex and other dinosaurs.
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Dig up a fossil today, and any dino-DNA within would have long since fallen apart. That means, as far as scientists know, and even using the best technology available today, it’s not possible to make a dinosaur from its DNA.
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You see, chicken DNA contains remnants from their dinosaur ancestors. If scientists can control the expression of some genes, and basically silence chicken-specific development, they can essentially uncover the remnant ancestral dinosaur genes, and see what grows during this altered chicken development.