AST 207 Test 2 26 October 2011
... The sun will be a main-sequence star for 10 Byr, and then it becomes a giant, which engulfs Earth. Therefore the sun will stay small for another 5 Byr. b. (2 pts.) Why does the helium in the core of the sun not fuse at the present time? (1 pt.) When that helium does fuse eventually, what will the he ...
... The sun will be a main-sequence star for 10 Byr, and then it becomes a giant, which engulfs Earth. Therefore the sun will stay small for another 5 Byr. b. (2 pts.) Why does the helium in the core of the sun not fuse at the present time? (1 pt.) When that helium does fuse eventually, what will the he ...
Explore the Galaxy - Museum of Science, Boston
... a spherical shape with Earth at the center. The earliest signals with enough power to escape the Earth were broadcast in the mid-1930s, and all subsequent signals will continue to extend out into space at the speed of light. Because they have traveled much faster and farther than any spacecraft, the ...
... a spherical shape with Earth at the center. The earliest signals with enough power to escape the Earth were broadcast in the mid-1930s, and all subsequent signals will continue to extend out into space at the speed of light. Because they have traveled much faster and farther than any spacecraft, the ...
The Life Cycle of a Star
... to gravity, the protostar has reached equilibrium and is therefore reached a reasonably stable size. ...
... to gravity, the protostar has reached equilibrium and is therefore reached a reasonably stable size. ...
PHYXXXX UNIVERSITY OF EXETER PHYSICS XXX/YYY 20XX
... material as it makes its way to the star. Name three ways in which angular momentum can be removed in the star formation process. ...
... material as it makes its way to the star. Name three ways in which angular momentum can be removed in the star formation process. ...
Problem Sheet for Introduction to Astrophysics
... a) How much brighter will a star of 1st magnitude appear compared with one of 9th magnitude? b) What is the apparent magnitude of a star that appears 2.512 times less bright than the 0th magnitude star Vega? c) Two stars of identical luminosity are observed. The apparent brightness of the more dista ...
... a) How much brighter will a star of 1st magnitude appear compared with one of 9th magnitude? b) What is the apparent magnitude of a star that appears 2.512 times less bright than the 0th magnitude star Vega? c) Two stars of identical luminosity are observed. The apparent brightness of the more dista ...
Life Cycles of Stars
... Massive Stars (8 times or more larger than the Sun. Core remains massive after the supernova. Fusion is stopped. Nothing supports the core. The core is swallowed by its gravity. It becomes a black hole ...
... Massive Stars (8 times or more larger than the Sun. Core remains massive after the supernova. Fusion is stopped. Nothing supports the core. The core is swallowed by its gravity. It becomes a black hole ...
black holes blog
... description of a black hole is through Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core. If the core's mass is more than about three times the mass of the Sun, the equations showed, the force of gravity overwhelms all o ...
... description of a black hole is through Einstein's theory of general relativity, which showed that when a massive star dies, it leaves behind a small, dense remnant core. If the core's mass is more than about three times the mass of the Sun, the equations showed, the force of gravity overwhelms all o ...
ASTR 1020 FINAL EXAM STUDY GUIDE
... whether the accretion disk surrounds a neutron star or a black hole. What phenomenon occurs in a neutron star system, but not in the black hole system? 6) If you replaced the Sun with a black hole of the same mass, what would happen to the Earth? ...
... whether the accretion disk surrounds a neutron star or a black hole. What phenomenon occurs in a neutron star system, but not in the black hole system? 6) If you replaced the Sun with a black hole of the same mass, what would happen to the Earth? ...
Star Questions 2008 - Fort Thomas Independent Schools
... Describe the death of these two stars, one with 2 solar masses and one with 10 solar masses. What is a supernova and what is its significance? Describe the difference between a Type I and Type II supernova? What will happen to our Sun when it dies? Which is more luminous, a low-mass or a high-mass s ...
... Describe the death of these two stars, one with 2 solar masses and one with 10 solar masses. What is a supernova and what is its significance? Describe the difference between a Type I and Type II supernova? What will happen to our Sun when it dies? Which is more luminous, a low-mass or a high-mass s ...
2008 - UCL
... 10. Sketch a diagram showing the typical form of the 'rotation curve' for spiral gaiaxies. Comment on the nature of the rotation curve, and the main inference drawn from ...
... 10. Sketch a diagram showing the typical form of the 'rotation curve' for spiral gaiaxies. Comment on the nature of the rotation curve, and the main inference drawn from ...
मराठ% &व( सा+ह-य-&व(: /डस1बर २००९ – जानेवार7 २०१० :ैमा<सक वष? २१ वे अंक Cतसरा
... observation properties one is likely to encounter. The widely accepted theories suggest that there are three such properties: mass, charge and angular momentum. What happens, for instance, to the information that went into a blackhole? Barring the three properties above, we seem to lose track of wha ...
... observation properties one is likely to encounter. The widely accepted theories suggest that there are three such properties: mass, charge and angular momentum. What happens, for instance, to the information that went into a blackhole? Barring the three properties above, we seem to lose track of wha ...
Chpt12a
... together then material from one star can be pulled off by the other star. The material then forms an accretion disk before the material falls to the surface. If enough hydrogen gets dumped on a white dwarf star, then eventually the material will explosively ignite and we will have a nova. Once a nov ...
... together then material from one star can be pulled off by the other star. The material then forms an accretion disk before the material falls to the surface. If enough hydrogen gets dumped on a white dwarf star, then eventually the material will explosively ignite and we will have a nova. Once a nov ...
Integrative Studies 410 Our Place in the Universe
... Lifecycle • Lifecycle of a main sequence G star • Most time is spent on the main-sequence (normal star) ...
... Lifecycle • Lifecycle of a main sequence G star • Most time is spent on the main-sequence (normal star) ...
escape velocity
... a mass of 2 to 3 solar masses in their cores • Nothing in the universe is strong enough to hold up the remaining mass against the force of gravity, so it collapses into a black hole • Matter that falls into a black hole disappears from contact with the rest of the Universe….not even light can escape ...
... a mass of 2 to 3 solar masses in their cores • Nothing in the universe is strong enough to hold up the remaining mass against the force of gravity, so it collapses into a black hole • Matter that falls into a black hole disappears from contact with the rest of the Universe….not even light can escape ...
Page 1 Astronomy 110 Homework #08 Assigned: 03/13/2007 Due
... A) electric currents caused by the flow of ionized gas, heating dust particles B) free electrons emitting light as they pass close to, and are accelerated by, positively charged ions C) light emitted when electrons jump between energy states in hydrogen atoms D) high-energy electrons spiraling along ...
... A) electric currents caused by the flow of ionized gas, heating dust particles B) free electrons emitting light as they pass close to, and are accelerated by, positively charged ions C) light emitted when electrons jump between energy states in hydrogen atoms D) high-energy electrons spiraling along ...
Powerpoint - Astronomy at Swarthmore College
... plots show the speed at which the material is moving towards or away from the observer, who is positioned in the top center of the image. Blue corresponds to material moving towards the observer (which would be blueshifted), while red corresponds to material moving away from the observer (red-shifte ...
... plots show the speed at which the material is moving towards or away from the observer, who is positioned in the top center of the image. Blue corresponds to material moving towards the observer (which would be blueshifted), while red corresponds to material moving away from the observer (red-shifte ...
Phys133-Sample MT2
... 10) Compared to the star it evolved from, a red giant is A) cooler and brighter. B) hotter and brighter. C) hotter and dimmer. D) the same temperature and brightness. E) cooler and dimmer. ...
... 10) Compared to the star it evolved from, a red giant is A) cooler and brighter. B) hotter and brighter. C) hotter and dimmer. D) the same temperature and brightness. E) cooler and dimmer. ...
PowerPoint - Chandra X
... pulsar from very recent VLBI work, obtained independently, increased the efficiency from the published value of 0.4%. A proper motion corresponding to a velocity of 130 km/s was measured for J0108 by comparing with a radio position obtained in 2001. This enabled a likely optical identification of th ...
... pulsar from very recent VLBI work, obtained independently, increased the efficiency from the published value of 0.4%. A proper motion corresponding to a velocity of 130 km/s was measured for J0108 by comparing with a radio position obtained in 2001. This enabled a likely optical identification of th ...
Slide 1
... potential accelerators, massive stars present circumstellar matter fields lot of material for particle collisions. ...
... potential accelerators, massive stars present circumstellar matter fields lot of material for particle collisions. ...
The Main Sequence
... • How dense can something get? • How strong can the force of gravity be? • What if the escape velocity is faster than light? ...
... • How dense can something get? • How strong can the force of gravity be? • What if the escape velocity is faster than light? ...
BlackHoles - Montgomery College
... Some X-ray binaries show jets perpendicular to the accretion disk ...
... Some X-ray binaries show jets perpendicular to the accretion disk ...
Stellar Deaths - Mid
... Iron core at T ~ 1010 K radiation photodisintegrates iron nuclei into protons and neutrons. Core collapses in < 1 sec. Neutrons “rebound”. Shock ejects outer layers => Core-collapse or Type II ...
... Iron core at T ~ 1010 K radiation photodisintegrates iron nuclei into protons and neutrons. Core collapses in < 1 sec. Neutrons “rebound”. Shock ejects outer layers => Core-collapse or Type II ...
White Dwarfs
... In a binary system, each star controls a finite region of space, bounded by the Roche Lobes (or Roche surfaces). ...
... In a binary system, each star controls a finite region of space, bounded by the Roche Lobes (or Roche surfaces). ...
Scientists classify stars by
... would look the same because the two lights are exactly the same. Their absolute magnitude is the same. Distance makes them look different. The same is true for stars. Two stars could be the same brightness but their distance from us makes their brightness different. ...
... would look the same because the two lights are exactly the same. Their absolute magnitude is the same. Distance makes them look different. The same is true for stars. Two stars could be the same brightness but their distance from us makes their brightness different. ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.