These relatively small black holes can also be made through the merger of two dense stellar remnants called neutron stars. Black holes grow by accreting surrounding matter … A neutron star can also merge with a black hole to make a bigger black hole, or two black holes can collide. C) lie in the cores of the most massive galaxies. 1) In a neutron star, the protons and electrons are fused together, leaving only neutrons.2) Neutron stars are 100,000 times denser than white dwarfs.3) Stars of less than 8 solar masses will not go supernova.4) A neutron star is what remains after a Type II supernova explosion has destroyed the rest of5) In a neutron star, the electrons in the core are all in contact with each other.6) Newly-formed neutron stars start with weak magnetic fields, but they strengthen over time7) The ʺpulseʺ from a pulsar is due to the rapidly expanding and contracting outer shell of the8) Most pulsars are known only as radio sources, but a few of the younger ones, like the Crab10) The pulses from a pulsar are most likely coming from localized areas near the magnetic poles.12) Planet-sized bodies have been detected around pulsars.13) While most pulsars slow down over time, millisecond pulsars spin faster due to mass transfer14) No planets have ever been found around any pulsars.15) Planets similar to our terrestrials have been found orbiting pulsars.16) Millisecond pulsars are never members of close binary systems.18) A hypernova is a gamma-ray burster that forms a black hole as well.19) Gamma-ray bursters are all found to be within our galaxy.20) Gamma-ray bursters seem scattered randomly over the entire sky.21) No optical traces have been found of the gamma-ray bursters.22) All the gamma-ray bursters measured to date have distances of millions or even billions of23) All gamma-ray bursters have the same fundamental driving mechanism, although we donʹt24) Some gamma-ray bursters may be due to the merger of a neutron star and a black hole.25) Only high-energy gamma rays can escape the event horizon of a black hole.26) Any main-sequence star over 25 solar masses will probably retain enough matter in its core27) The escape speed at the event horizon of a black hole is c, 300,000 km/sec.28) All Type II supernovae produce neutron stars when they collapse.29) The Schwarzschild radius of a black hole is about 3 km per solar mass.30) Special relativity says that c, the speed of light, is the maximum velocity for both matter and31) Both space and time are warped near the strong gravitational fields of neutron stars and black32) No communication is possible across an event horizon.33) Einsteinʹs prediction of the curvature of space was confirmed by the 1919 total solar eclipse.34) Because of their immense size, black holes moving through space consume huge quantities of35) Even if a probe were in a stable orbit near a black hole, we would still observe its signals red36) The presently known laws of physics clearly describe the conditions inside a black holeʹs event37) The closer the observer comes to the event horizon, the slower his watch will appear to run toA) made of compressed neutrons in contact with each other39) Two important properties of young neutron stars areC) extremely rapid rotation and a strong magnetic field40) An object more massive than the Sun, but roughly the size of a city, is a43) Most pulsars are observed only as ________ sources.45) What makes the Crab Nebula pulsar unusual among other pulsars?C) It is relatively bright in shorter wavelengths, like visible and X-raysC) if the beam sweeps across us, we will detect a pulse of radiationB) a pulsar with a period of 33 milliseconds, visible optically51) Three terrestrial-sized planets in orbits of a fraction of an AU have been found near52) Two-thirds of all known millisecond pulsars are found in what type of object?53) X-ray bursters occur in binary star systems. The supermassive black hole at the center of the Milky Way, Sagittarius A*, is 4.3 million solar masses.
This is the only black hole whose mass has been measured directly by observing the full orbit of a circling star. Monster black holes hide in the centers of most galaxies in the universe, and now, a new technique is helping scientists measure the mass of some of the very largest black holes … IGR J17091-3624 (candidate smallest stellar black hole) LB-1 (name of both a galactic B-type star, as well as the name of a very closely associated over-massive stellar-mass black hole.) The two types of stars that must be present toD) a main-sequence or giant star and a neutron star in a mass transfer binary56) A proposed explanation for gamma-ray bursters is57) What would happen if more mass was added to a 1.4 -solar-mass neutron star?58) In a hypernova, a very energetic supernova creates a60) Which statement about gamma ray bursters is not correct?B) They are scaled up X-ray bursters, with more massive objects involved.61) Which are the two most popular candidates for gamma-ray bursters?C) hypernova making a black hole, and merger of two neutron starsA) Their escape velocity is greater than the speed of light63) The densely packed neutrons of a neutron star cannot balance the inward pull of gravity if theB) greater than Schwartzschildʹs limit of 3 solar masses64) The Schwartzschild radius for a 12 solar mass star is65) What explanation does general relativity provide for gravity?66) An observer on a planet sees a spaceship approaching at 0.5c.
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