midterm Flashcards
(76 cards)
what is correct order of stellar spectral types from coolest to hottest?
MKGFABO
what is the order of the electromagnetic in order of increasing wavelength
GXUVIMR
gamma ray, x-ray, ultraviolet, visible, infrared, microwave, radio
according to the general theory of relativity, the presence of mass
causes a curvature (or warping) of spacetime
from einstein’s theory of general relativity, which of the follow occurs near a massive object, for instance near the event horizon of a black hole
time slows down, light emitted, spacetime is curved ALL OF THE ABOVE
in the sun suddenly collapsed to become a black hole, what would happen to the earth’s orbti
earth would keep orbiting as it currently does
einstein’s general theory of relativity describes gravity as
distortion of 4 dimensional spacetime
once a black hole forms, the size of the event horizon is determined only by
the mass of the black hole
region around a black hole within which everything is trapped and nothing can get out to interact with the rest of the universe
event horizon
first direct detection of gravitiational waves by ligo in 2015, the waves came from
the merger of two black holes
the effect that prevents a neutron star from collapsing even further into a black hole is called
neutron degeneracy pressue
which are two possible end states of a high-mass star after its supernova explosion
neutron star or black hole
why do we think there is a supermassive black hole at the center of our milky way galaxy
we see stars orbiting the center of the milky way galaxy with extreme speeds
you measure the object’s mass to be 8.5 m so you deduce that the unknown object is
a black hole
what happens for an object that approaches the event horizon of a black hole
time slows down
even though we can’t see it, how do we know that the x-ray binary system cygnus x-1 has a black hole
mass of the invisible object is too big to be a neutron star
which of the following is true about black hole
black holes can be formed as the remnants of massive stars after a supernova explosion
what is true about stellar corpses
black hole can form from a neutron star that exceeds 3 solar masses
what happens to the radius of the event horizon as material falls into a black hole
increases
where do we have strong evidence for the presence of a black hole
at the center of our milky way galaxy
how do we measure the mass of a black hole in an x-ray binary system
with the orbital period and velocities inferred from the doppler shift
what is the smallest in size (radius)
neutron stars
supernova 1987a emitted neurons that signified the formation of a neutron star
SN 1987A could still have left behind a neutron star
how do massive stars enrich the interstellar medium for subsequent generations of stars and planets
massive stars evolve quickly compared to low-mass stars, releasing a lot of material containing helium and heavier elements
what happens to a white dwarf it it accretes material from a binary companion and reaches the white dwarf
explodes as a white dwarf supernova