Ch.11 Massive star death
... — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
... — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
Document
... • 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? ...
Document
... A probe nearing the event horizon of a black hole will be seen by observers as experiencing a dramatic redshift as it gets closer, so that time appears to be going more and more slowly as it approaches the event horizon. This is called a gravitational redshift—it is not due to motion, but to the lar ...
... A probe nearing the event horizon of a black hole will be seen by observers as experiencing a dramatic redshift as it gets closer, so that time appears to be going more and more slowly as it approaches the event horizon. This is called a gravitational redshift—it is not due to motion, but to the lar ...
Neutron Stars and Black Holes - School
... Before any evidence of black holes existed they were known to be a theoretical possibility. After a supernova explosion there remains an incredibly dense neutron star. If the mass of the Sun from which it originated was great enough then the neutron star could be a black hole. The gravitational fiel ...
... Before any evidence of black holes existed they were known to be a theoretical possibility. After a supernova explosion there remains an incredibly dense neutron star. If the mass of the Sun from which it originated was great enough then the neutron star could be a black hole. The gravitational fiel ...
Black Holes
... A probe nearing the event horizon of a black hole will be seen by observers as experiencing a dramatic redshift as it gets closer, so that time appears to be going more and more slowly as it approaches the event horizon. This is called a gravitational redshift – it is not due to motion, but to the l ...
... A probe nearing the event horizon of a black hole will be seen by observers as experiencing a dramatic redshift as it gets closer, so that time appears to be going more and more slowly as it approaches the event horizon. This is called a gravitational redshift – it is not due to motion, but to the l ...
What is at the surface of a black hole?
... • These have never been observed • Mathematical models suggest that these might evaporate over time. ...
... • These have never been observed • Mathematical models suggest that these might evaporate over time. ...
15compact2s
... A huge mass in such a tiny space creates a powerful gravitational field The object is called a black hole ...
... A huge mass in such a tiny space creates a powerful gravitational field The object is called a black hole ...
Lec10
... • Beyond the neutron star limit, no known force can resist the crush of gravity. • As far as we know, gravity crushes all the matter into a single point known as a singularity. ...
... • Beyond the neutron star limit, no known force can resist the crush of gravity. • As far as we know, gravity crushes all the matter into a single point known as a singularity. ...
Document
... • As density increases, the force of gravity on the surface increases. • The greater the force, the higher the escape velocity: – How fast you need to go in order to escape the surface. ...
... • As density increases, the force of gravity on the surface increases. • The greater the force, the higher the escape velocity: – How fast you need to go in order to escape the surface. ...
Powerpoint
... 2. If you are in freefall, you are also weightless. Einstein says these are equivalent. So in freefall, the light and the ball also travel in straight lines. 3. Now imagine two people in freefall on Earth, passing a ball back and forth. From their perspective, they pass the ball in a straight line. ...
... 2. If you are in freefall, you are also weightless. Einstein says these are equivalent. So in freefall, the light and the ball also travel in straight lines. 3. Now imagine two people in freefall on Earth, passing a ball back and forth. From their perspective, they pass the ball in a straight line. ...
Hawking Radiation and Black Hole Evaporation
... Refutations (from the purely classical point of view): ✘ The temperature of a black hole vanishes! ✘ Entropy is dimensionless, the horizon area is a length squared! ✘ The area is separately non-decreasing, whereas only the total ...
... Refutations (from the purely classical point of view): ✘ The temperature of a black hole vanishes! ✘ Entropy is dimensionless, the horizon area is a length squared! ✘ The area is separately non-decreasing, whereas only the total ...
90737_RQ_BlackHole12A
... _____1. A black hole is like a cosmic vacuum cleaner, sucking up everything around it. _____2. In a black hole, gravity is so strong that the escape velocity exceeds light speed. _____3. NASA has sent a probe into a black hole. _____4. Our Sun will eventually turn into a black hole. _____5. A massiv ...
... _____1. A black hole is like a cosmic vacuum cleaner, sucking up everything around it. _____2. In a black hole, gravity is so strong that the escape velocity exceeds light speed. _____3. NASA has sent a probe into a black hole. _____4. Our Sun will eventually turn into a black hole. _____5. A massiv ...
General Relativity and Black Holes
... • In 1919, during a total eclipse of the Sun, the predicted deflection of starlight for stars near to the limb of the Sun was measured and Einstein became a household name. • GR also predicted that time would slow in strongly curved space. This was verified experimentally in 1958. ...
... • In 1919, during a total eclipse of the Sun, the predicted deflection of starlight for stars near to the limb of the Sun was measured and Einstein became a household name. • GR also predicted that time would slow in strongly curved space. This was verified experimentally in 1958. ...
PowerPoint - Chandra X
... detected by Chandra are shown in gold, while optical data from ESO’s Very Large Telescope are shown in yellowwhite and blue, and infrared data from Spitzer are red. ...
... detected by Chandra are shown in gold, while optical data from ESO’s Very Large Telescope are shown in yellowwhite and blue, and infrared data from Spitzer are red. ...
Black Holes S.Chandrasekhar (1910-1995) March 27
... Nothing can escape from within the event horizon because nothing can go faster than light. No escape means there is no more contact with something that falls in. It increases the hole mass, changes the spin or charge, but otherwise loses its ...
... Nothing can escape from within the event horizon because nothing can go faster than light. No escape means there is no more contact with something that falls in. It increases the hole mass, changes the spin or charge, but otherwise loses its ...
special relativity and general relativity
... • Special theory of relativity • general theory of relativity (the theory of gravity, 1916) ...
... • Special theory of relativity • general theory of relativity (the theory of gravity, 1916) ...
Today`s Powerpoint
... If core with about 3 MSun or more collapses, not even neutron pressure can stop it (total mass of star about 25 MSun). Core collapses to a point, a "singularity". Gravity is so strong that nothing can escape, not even light => black hole. Schwarzschild radius for Earth is 1 cm. For a 3 MSun object, ...
... If core with about 3 MSun or more collapses, not even neutron pressure can stop it (total mass of star about 25 MSun). Core collapses to a point, a "singularity". Gravity is so strong that nothing can escape, not even light => black hole. Schwarzschild radius for Earth is 1 cm. For a 3 MSun object, ...
Black Holes and Cosmic Roles: Understanding the Center of the
... • Supermassive Black Hole: The most massive type of black hole found in our universe with masses that range from hundreds of thousands to billions of times the mass of the sun. There is even one in our galaxy! • Stellar Mass Black Hole: The smallest observed type of black holes with masses that are ...
... • Supermassive Black Hole: The most massive type of black hole found in our universe with masses that range from hundreds of thousands to billions of times the mass of the sun. There is even one in our galaxy! • Stellar Mass Black Hole: The smallest observed type of black holes with masses that are ...