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which of the following best describes a black hole?

Which of the following best describes the black hole status within the Milky Way?There are no black holes in the Milky Way.There is a supermassive black hole that is about 15 million miles across.There is a small black hole that is only beginning to form.There are at least five black holes of You learned about the general concept of parallax in Chapter 2, and the video offers a review of the basic ideas. event horizon. What is the Schwarzschild radius of a 10 solar mass black hole? 2. An object that sucks in all the light from stars that are near it. We're not certain. This is an example of the more general observation that __________.Overall, careful study of the patterns revealed in the graph of measured element abundances has allowed scientists to __________.A spinning neutron star has been observed at the center of a ________.Algol consists of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. We're not certain. We know with certainty that SMBH formed from collapsing clouds of gas. c. A place from which the escape velocity exceeds the speed of light.

A funnel-shaped, bottomless pit in the universe. A place from which the escape velocity exceeds the speed of light. Why do astronomers hypothesize that a massive black hole lies at the center of M 87?A very small region at the center of M 87 releases an enormous amount of energy.The third image in the interactive photo (with the most detailed view of the galactic center) is labeled "gas disk." b. a. The black hole is located deep within the bright central region, and around this region we see gas that is orbiting the central black hole Assuming that the bright core of M 87 is powered by a supermassive black hole, which of the following best describes the source of energy that makes the core appear so bright? Why?If you were inside the rocket that falls toward the event horizon, you would notice your own clock to be running __________.If you were inside the rocket that falls toward the event horizon, from your own viewpoint you would __________.Suppose that a white dwarf is gaining mass through accretion in a binary system. To check your understanding of the concept, which of the following is a valid way of demonstrating parallax for yourself?Which of the following makes it possible for us to observe stellar parallax (from Earth)?Compared to a nearer star, a more distant star will have a __________.Compared to a main-sequence star with a short lifetime, a main-sequence star with a long lifetime is __________.Compared to a high-luminosity main-sequence star, stars in the upper right of the H-R diagram are __________.Compared to a low-luminosity main-sequence star, stars in the lower left of the H-R diagram are __________.What do we need to measure in order to determine a star's luminosity?Assuming that we can measure the apparent brightness of a star, what does the inverse square law for light allow us to do?According to the inverse square law of light, how will the apparent brightness of an object change if its distance to us triples?Star A and B have the same luminosity, but star B is 10 times farther from Earth than star A. All of the images except the first two show radio, infrared, or X-ray light. The boundary from within which light cannot escape from a black hole is called the black hole's _____. The boundary from within which light cannot escape from a black hole is called the black hole's _____. Which of the following best describes a black hole? What happens if the mass someday reaches the 1.4 solar mass limit?Why is there an upper limit to the mass of a white dwarf?A typical neutron star is more massive than our Sun and about the size (radius) of _________.Which of the following statements about electron degeneracy pressure and neutron degeneracy pressure is true?Which of the following correctly describes how light will be affected as it tries to escape from a massive object like a neutron star?Viewed from a distance, how would a flashing red light appear as it fell into a black hole?What would happen if the Sun suddenly became a black hole without changing its mass?The Schwarzschild radius of a black hole depends on ________.What do we mean by the event horizon of a black hole?Which of the following statements correctly summarize key differences between the disk and the halo?The Sun's location in the Milky Way Galaxy is _________.How do we know the total mass of the Milky Way Galaxy that is contained within the Sun's orbital path?Over time, what is the net effect of the star-gas-star cycle in the Milky Way?Where are most elements heavier than hydrogen and helium made?Which kind of star is most likely to be part of the spheroidal population?How do we determine the Milky Way's mass outside the Sun's orbit?Where are most of the Milky Way's globular clusters found?If you wanted to observe the center of our galaxy, you would need to point a telescope in the direction of the constellation __________.Consider the portion of the video that starts with the all-sky view of the Milky Way and then zooms in to the galactic center. d. event horizon. Which of the following best describes a black hole? Gravitational potential energy is converted to thermal energy as matter from the surrounding gas disk spirals into the central black hole. We know with certainty that SMBH formed from the mergers of stellar mass black holes. Which of the following best describes our knowledge of supermassive black hole (SMBH) formation? What is the Schwarzschild radius of a 10 solar mass black hole? Why don't these images show visible light?What characteristics of the orbiting stars do we need to measure in order to calculate the mass of the central object, Sgr A*?What kind of object do we think lies at the center of the Milky Way Galaxy?What evidence supports the existence of a very massive black hole at the center of our galaxy? How much brighter will star A appear?Since all stars begin their lives with the same basic composition, what characteristic is most important in determining how they will differ?Which of these stars has the greatest surface temperature?Which of these stars has the coolest surface temperature?Which of the following facts about stars in a cluster make it possible to determine the approximate age of the cluster?How do the properties of long-lived stars compare to those of short-lived stars?A main-sequence star twice as massive as the Sun would last __________.If stars A and B are both main-sequence stars and star A has a greater fusion rate than star B, which of the following statements hold(s)?Which process is required to allow a gravitationally-collapsing gas cloud to continue to collapse?What would you be most likely to find if you returned to the solar system in 10 billion years?Stars spend about 90% of their lifetime on the main sequence.Stars with high masses live longer than stars with lower masses.Which of the following sequences correctly describes the stages of life for a one solar mass star?What happens when a star like the sun exhausts its core hydrogen supply?What happens to the core of a star after the planetary nebula stage?Why are the very lowest mass stars unable to fuse helium in their cores?The most massive stars generate energy at the end of their lives by fusing iron in their cores.Carbon fusion occur in high-mass stars but not in low-mass stars because ________.Why is iron significant to understanding how a supernova occurs?What types of stars end their lives with supernovae?According to our modern understanding of the origin of elements, why are hydrogen and helium so much more abundant than any other elements?Notice that nitrogen is less abundant than either carbon or oxygen.

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