Black Holes - WordPress.com
... If an object has an escape velocity greater then the speed of light, then nothing, not even light, can escape its surface. From the outside, We would never see anything come from that object. It is a Black Hole. ...
... If an object has an escape velocity greater then the speed of light, then nothing, not even light, can escape its surface. From the outside, We would never see anything come from that object. It is a Black Hole. ...
Linking Asteroids and Meteorites through Reflectance
... • Collapsing due to gravity • The collapse is stopped by electron degeneracy pressure ...
... • Collapsing due to gravity • The collapse is stopped by electron degeneracy pressure ...
Stars
... Kepler’s 3rd law) imply a mass of 2.6106 solar masses inside a volume 0.03 light years in diameter. It is impossible to pack stars together that tightly – they would collide, destroying each other very quickly. It is likely that the object at the center of our galaxy is a super massive black hole. ...
... Kepler’s 3rd law) imply a mass of 2.6106 solar masses inside a volume 0.03 light years in diameter. It is impossible to pack stars together that tightly – they would collide, destroying each other very quickly. It is likely that the object at the center of our galaxy is a super massive black hole. ...
Death of Stars
... Birth Place of Stars: Dark and cold inter-stellar clouds These clouds are made of more hydrogen than helium. These clouds have very small amount of heavier elements. ...
... Birth Place of Stars: Dark and cold inter-stellar clouds These clouds are made of more hydrogen than helium. These clouds have very small amount of heavier elements. ...
What is the net result of the proton-proton chain? a. 2 protons make
... Some regions of the Milky Way appear dark because: a. There are no stars there b. Stars in that direction are obscured by interstellar gas c. Stars in that direction are obscured by interstellar dust d. The magnetic field has directed the polarized light away from these regions e. There are numerous ...
... Some regions of the Milky Way appear dark because: a. There are no stars there b. Stars in that direction are obscured by interstellar gas c. Stars in that direction are obscured by interstellar dust d. The magnetic field has directed the polarized light away from these regions e. There are numerous ...
Introduction - University of Iowa Astrophysics
... Gamma-rays • Formal definition of X-ray versus gamma-ray is that X-rays come from electronic transitions while gamma-rays come from nuclear ...
... Gamma-rays • Formal definition of X-ray versus gamma-ray is that X-rays come from electronic transitions while gamma-rays come from nuclear ...
Endpoints of Stellar Evolution
... • Neutron stars are the equivalent of white dwarfs, but the degeneracy pressure is provided by neutrons, not electrons • The star cools passively as it radiates its latent heat,becoming fainter and cooler, and at some point it crystalises • Cooling time ~ many billions of years ...
... • Neutron stars are the equivalent of white dwarfs, but the degeneracy pressure is provided by neutrons, not electrons • The star cools passively as it radiates its latent heat,becoming fainter and cooler, and at some point it crystalises • Cooling time ~ many billions of years ...
Star Game Cards
... abundant gas is ____ which is also the element that fuses first to make a star. ...
... abundant gas is ____ which is also the element that fuses first to make a star. ...
File
... asteroids are known as "________ ________" range in size from ____ metre to hundreds of _________ largest is ________ (1000 km) ________ rich materials potential ___________ hazard Comets mainly ______ and _____ (dirty snowball) as they orbit the Sun, material ________ forming the tail ...
... asteroids are known as "________ ________" range in size from ____ metre to hundreds of _________ largest is ________ (1000 km) ________ rich materials potential ___________ hazard Comets mainly ______ and _____ (dirty snowball) as they orbit the Sun, material ________ forming the tail ...
Galaxies and Stars Questions KEY
... to fuse, which causes the outer part of the star to expand forming a red giant or supergiant, depending on its original mass. 8. What kind of stars become white dwarfs? Main sequence stars, specifically small and medium stars, become white dwarfs. 9. What causes neutron stars to form? After a high m ...
... to fuse, which causes the outer part of the star to expand forming a red giant or supergiant, depending on its original mass. 8. What kind of stars become white dwarfs? Main sequence stars, specifically small and medium stars, become white dwarfs. 9. What causes neutron stars to form? After a high m ...
The coolest White Dwarf— older than the age of the universe?
... its life as a ball of compact degenerate electron gas or a White Dwarf (WD). It may begin this stage with a very high temperature, say 50,000 K and it steadily cools over time following a well-known cooling rate. Eventually this object will cool so much that it will become a ‘black dwarf’ and will b ...
... its life as a ball of compact degenerate electron gas or a White Dwarf (WD). It may begin this stage with a very high temperature, say 50,000 K and it steadily cools over time following a well-known cooling rate. Eventually this object will cool so much that it will become a ‘black dwarf’ and will b ...
What is a Star
... that have been produced are scattered in the interstellar space, and from this "dust"new stars and planets are born. Stellar remnants: Neutron stars These stars are composed mainly of neutrons and are produced from the remnants of the core when a supernova explodes. Neutron stars are very dense, hav ...
... that have been produced are scattered in the interstellar space, and from this "dust"new stars and planets are born. Stellar remnants: Neutron stars These stars are composed mainly of neutrons and are produced from the remnants of the core when a supernova explodes. Neutron stars are very dense, hav ...
Unit 49-59 Review
... b. Is conserved if there no friction c. Can be converted into energy 3. The Sun is supported against the crushing force of its own gravity by a. Magnetic forces b. Its rapid rotation c. The force exerted by escaping neutrinos d. Gas pressure 4. Which will take longer to escape from the center of the ...
... b. Is conserved if there no friction c. Can be converted into energy 3. The Sun is supported against the crushing force of its own gravity by a. Magnetic forces b. Its rapid rotation c. The force exerted by escaping neutrinos d. Gas pressure 4. Which will take longer to escape from the center of the ...
Stellar Evolution Slideshow
... only neutrons are left (Guess where the name “Neutron Stars” came from?) Also called Pulsars because they emit radio waves with incredible regularity. Appear to be rapidly rotating neutron star ...
... only neutrons are left (Guess where the name “Neutron Stars” came from?) Also called Pulsars because they emit radio waves with incredible regularity. Appear to be rapidly rotating neutron star ...
29.3-stellar-evolution
... The mass of a star governs its temperature, luminosity, and diameter. Mass effects The more massive a star is, the greater the gravity pressing inward and the hotter and more dense it has to be in order to balance its own gravity. Fusion The density and temp in a star increase toward the center, ...
... The mass of a star governs its temperature, luminosity, and diameter. Mass effects The more massive a star is, the greater the gravity pressing inward and the hotter and more dense it has to be in order to balance its own gravity. Fusion The density and temp in a star increase toward the center, ...
Starending jeopardy
... Once hydrogen is depleted it can no longer fuse hydrogen into helium. With no energy source to cause outware pressure the gravity is able to collapse the core and change the star’s structure. ...
... Once hydrogen is depleted it can no longer fuse hydrogen into helium. With no energy source to cause outware pressure the gravity is able to collapse the core and change the star’s structure. ...
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... iron nucleus is mFe = 9.29x10-‐26 kg = 55.52 mp, estimate energy per proton released as 56 protons fusion to 56Fe. [Optional: What is the lifetime of the star in this case compare with (3b)?] ...
... iron nucleus is mFe = 9.29x10-‐26 kg = 55.52 mp, estimate energy per proton released as 56 protons fusion to 56Fe. [Optional: What is the lifetime of the star in this case compare with (3b)?] ...
DOC - Cool Cosmos
... Like the tug of gravity on Earth, a black hole exerts the same kind of force on its surroundings. But with these fantastically compact and massive objects, the gravitational pull is so strong that even light can't escape. That is why the object is “black” -- it does not give off any light. It’s as i ...
... Like the tug of gravity on Earth, a black hole exerts the same kind of force on its surroundings. But with these fantastically compact and massive objects, the gravitational pull is so strong that even light can't escape. That is why the object is “black” -- it does not give off any light. It’s as i ...
Postgraduate Seminar Series Small Angle Neutron scattering on the anisotropic superconductor CaC6.
... graphene planes. The temperature and field dependence of the scattered intensity allows the in-plane zero temperature value of the coherence length and the London penetration depth to be estimated. The orientation of the vortex lattice is fixed relative to the rotation axis of the crystal as predict ...
... graphene planes. The temperature and field dependence of the scattered intensity allows the in-plane zero temperature value of the coherence length and the London penetration depth to be estimated. The orientation of the vortex lattice is fixed relative to the rotation axis of the crystal as predict ...
1 Ay 124 Winter 2014 – HOMEWORK #1
... b) At that distance, what is the probability that the star is a member of the stellar halo rather than the stellar disk? What is the probability in the solar neighborhood of selecting a halo star from among all G5 spectral type stars? c) Now put some dust in the disk so that the interstellar reddeni ...
... b) At that distance, what is the probability that the star is a member of the stellar halo rather than the stellar disk? What is the probability in the solar neighborhood of selecting a halo star from among all G5 spectral type stars? c) Now put some dust in the disk so that the interstellar reddeni ...
Different types of YSOs
... • these cocoons obscure the visible light from the central star-like object, but are warmed by that visible light and so radiate in the IR ...
... • these cocoons obscure the visible light from the central star-like object, but are warmed by that visible light and so radiate in the IR ...
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.