Astronomers identify the "birth" of a real star (as opposed to the activities of a protostar) with what activity in the star? Astronomers use the term interstellar matter to refer to: The comet-hunting astronomer who made a list of over 100 nebulae and galaxies that could be mistaken for comets was, In figuring out the evolutionary tracks on the H-R diagram, astronomers. There is no length of time a cloud can exist for. High-mass stars become red supergiants, and then evolve to become blue supergiants. The Sun's chromosphere contains many jet-like projections that stick up into the transition region. The light element lithium (which, on Earth, is part of medications that improve the lives of people with mental health illnesses) is more common in cosmic rays than it is in the Sun and the stars. What happens to the positron created during the p-p chain of nuclear reactions inside the Sun? The closest star to the Sun, Proxima Centauri, was recently found to have a planet in its habitable zone. How long a main sequence star lives depends on how massive it is. Enchanted Learning. Stars smaller than a quarter the mass of the sun collapse directly into white dwarfs. This version of the Hertzprung-Russell diagram plots the temperatures of stars against their luminosities. Because white dwarfs are small, as their name implies, they are hard to see. ), a neutron star is slowing down (losing rotation energy). Which of the following statements about antimatter is true?

The Sun's interior generally becomes cooler and less dense as you move away from the center. What is part of the process in estimating the age of a cluster of stars? only on the right side of the diagram and never on the left, A type of star that has turned out to be extremely useful for measuring distances is, In order for the apparent brightness of a star to be a good indicator of its distance, all the stars would have to. hydrogen (about 70%) and helium (about 28%). there are an enormous number of protons inside the Sun, and some of them will fuse much sooner than the average, the nuclear force which holds nuclei together.

the electrons get as close to each other as possible and resist further compression. Compared to star A, star B will look. If this layer was too cold to do fusion throughout the main sequence stage, why is it suddenly warm enough? The position of a star in the diagram provides information about what stage it is in, as well as its mass and brightness. planets only form very late in the life of a star, just when it is ready to die, and thus last only a very short fraction of the star's life. Not all Protostars will become fully fledge stars like the Sun or Regulus for example. This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A so that the dim Sirius B (tiny dot at lower left) could be seen. Which of the following stages will our own Sun NOT go through in the future: As a cluster of stars begins to age, which type of star in the cluster will move off the main sequence of the H-R diagram first? Get ready for the 'Great Conjunction' of Jupiter and Saturn, SpaceX's Starship may help clean up space junk, On This Day in Space: Nov. 2, 2000: Expedition 1 arrives at the International Space Station, International Space Station at 20: Former astronauts talk about living and working in space. Find GCSE resources for every subject. New York, Soon in astronomical terms, not in what we could soon as in tomorrow or next year. To understand how stars evolve, astronomers have to know what types of stars there are and why they differ from each other in important ways. D) It becomes a neutron star. "Nature doesn't form stars in isolation," Mark Morris, of the University of California at Los Angeles (UCLS), said in a statement. B.After the main sequence stage, there is no further fusion of hydrogen anywhere in the star. In the process, new, heavier elements are created as the shock front passes through the material of the star.This is what's called a "core-collapse" supernova. Based on its temperature, brightness (luminosity), mass, and chemistry, the Sun is classified as a middle-aged star that is in a period of its life called the "main sequence". Eventually, the remnants will dissipate. 39) Which of the following sequences correctly describes the stages of life for . Elements heavier than iron can be created during: What incident in a massive star's life sets off (begins) the very quick chain of events that leads to a supernova explosion? It was a time of solar maximum, and there had been a big flare on the Sun earlier. One step is to "sort" stars into different bins, just as people might sort coins or marbles. A small protostar forms, powered by the collapsing material. An H-R Diagram plots the luminosity of stars against their: What was the first evidence that gravity outside our solar system worked the same way as it does inside? You will receive a verification email shortly. Red Giant phrase, at this stage, the Earth will have been consumed by the Sun, all life will have gone. Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. Will the Sun look like this in the far distant future? A friend (who does not have the new awareness which you have gained from this course) suggests that the mechanism that keeps the Sun shining as brightly as it does is the burning of coal.

The term "baryon cycle," as astronomers use it, refers to: the movement of interstellar material into the Galaxy and into stars and then the movement out when stars end their lives. The first stage on its way to being a star is the Protostar phase, this is when the cloud is collapsing and is trying to build up sufficient mass in order to start nuclear fusion. The density in the core reaches a point where the temperature is at least 8 to 10 million degrees Celsius. A star forms from massive clouds of dust and gas in space, also known as a nebula. High-mass stars become red supergiants, and then evolve to become blue supergiants. Why? Which of the following statements about the main sequence stage in the life of a star is FALSE? Solar wind particles can be captured by the Earth's magnetosphere. All messages will be reviewed before being displayed. Please deactivate your ad blocker in order to see our subscription offer. C) It increases its distance from the sun. Main Sequence stars can be referred to as Dwarf stars as they are smaller than the giant stars out there. If the original star had up to 10 times the mass of the sun, it burns through its material within 100 million years and collapses into a super-dense white dwarf.

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