Question 1 (1 point) Saved Why would Fornax A, a black hole with an estimated mass of 130-150 million solar masses, NOT be an example of a stellar-mass black hole? Fornax A is inside of a dwarf galaxy rather than an elliptical galaxy, and stellar- mass black holes only appear in elliptical galaxies, so this cannot be a stellar- mass black hole. Stellar-mass black holes have a solar mass of five to several tens of times the mass of the sun, so this black hole's mass is too large to be a stellar-mass black hole. This black hole has a quasar at its center, so it cannot be a stellar-mass black hole. Fornax A is at the center of its galaxy, so it cannot qualify as a stellar-mass black hole. Question 2 (1 point) Saved Schwarzschild was able to show that anything that has mass has the potential to become a black hole if it is compressed enough. True False Question 3 (1 point) Which term is most applicable to a discussion of angular momentum in the context of black holes? photon curvature spin time Question 4 (1 point) Which state below is NOT true about black holes? They are points or areas in space. They give off no light radiation. They have the strongest force of gravity in the universe. At their cores, the laws of physics still apply. Question 5 (1 point) In the sequence of steps in which a black hole is formed, a supernova occurs during the first two steps. True False Question 6 (1 point) What would happen if you passed through a wormhole? Time would freeze until you passed back through the wormhole. Another dimension would await you on the other end. Time would appear to slow down to an outside observer. You would end up in another point in spacetime. Question 7 (1 point) To escape a black hole, an object would have to travel 186,282 AU/second. True False Question 8 (1 point) Imagine that SpaceX also invented a way for your spacecraft to travel inside of a black hole and come back again, and to prove it, they wanted to build a tool-like a super-powerful telescope-for your friends and family to view your journey into and out of the black hole from their homes on Earth. From your family and friends' perspective, as you approached the black hole's event horizon, what would they see? the spacecraft frozen for all eternity the spacecraft spinning faster and faster the spacecraft "falling" into the black hole the spacecraft shot back from the black hole due to quantum power Question 9 (1 point) Which event in the history of black holes happened after Einstein's theory of general relativity was published in 1915? John Michell coined the term "black holes." Pierre-Simon de LaPlace mentioned the idea of black holes in a written work. Karl Schwarzschild correctly analyzed the relationship between the size of a black hole and its mass. John Wheeler concluded that if black holes did exist, light could not escape them. Question 10 (1 point) Which two terms are related to the word "radius" in terms of discussing black holes? light-year and solar mass supermassive and stellar-mass Schwarzschild and AU dwarf and elliptical Question 11 (1 point) When objects collapse and become black holes, their mass stays the same. True False Question 12 (1 point) Why can't we see anything past the event horizon? The "sandwich" of space folds over, preventing anyone from seeing anything. Light helps us see things and no light can escape out of-or be present in-a black hole. Light intensifies inside a black hole, blinding anyone who peers past the event horizon. Black holes destroy all light within 1,600 AU of their singularities, so we can't see anything near or inside a black hole. Question 13 (1 point) Imagine that time travel really is possible, and you get to meet Albert Einstein. As you talk with him, you summarize what you think you understand about his theory of relativity as follows: "Space, being represented by a three-dimensional sphere, can be curved inward under an object with mass." How would you expect Einstein to react to this summarization? He would correct you that space is actually represented by a flat grid. He would agree with most of your statement but correct you that space can only be curved by objects with a mass greater than 2 AU. He would agree with it and continue the conversation. He would remind you that space cannot be represented by tangible metaphors like this because it is 5-dimensional and beyond our comprehension. Question 14 (1 point) Which of these terms is applicable in a discussion of accretion? orbit quasar 3-dimensional diameter Question 15 (1 point) How did Einstein's theory of general relativity change the way scientists look at gravitational force? He proposed that each object can have the potential of having a gravitational force. He proved that gravity is the strongest force in the universe. He presented the idea that gravity is just a curvature in space. He concluded that gravitational forces are stronger closer to black holes.