Chapter 14 1. Radio galaxies have sources of unusually strong radio waves emitted on either side of the galaxy and active galaxies are spirals with small, highly luminous cores like Seyfert galaxies, they also have nuclei that are produced by matter plunging into super-massive black holes. 6. By observing the velocity of the stars that orbit the black hole or by the rotational speed of its accretion disk. 10.
Describe two ways in which gravity has a part in the life-cycle of a star- Gravity pulls the dust and gas in the nubula together, and compresses them so much that the inside becomes hot enough for fusion reactions to start. Gravity also pulls the remains of a red giant together after fusion reactions have stops. This forms a white dwarf. Theories about the universe- 1. What does red shift tell s about distant galaxies?
The Sun serves as a magnet that uses its gravitational pull to hold the solar system together. If the Sun were to disappear, what would hold the planets together? The answer might be a black hole. A black hole is a theorized body whose gravity is so strong that even light can’t escape from within it (Black Holes, Quasars &Universe by Harry L. Shipman p.64). If light can’t escape from a black hole, then it must be invisible - therefore how can we know that the black holes exist?
Science studies how everything works from the smallest (quarks) to the largest (Galactic clusters and possibly even bigger) But astronomy is just the science or study of how everything interacts in the universe. Astronomy studies how planets interact with stars and how stars interact in galaxies with their local group, then how local groups form clusters and how they interact with each other d. Who was Aristotle and what was his relationship to the science of
How does cosmology differ from astronomy? Cosmetology studies the birth and the possible deaths of the universe where as astronomy studies the actual objects in the universe What is a galaxy? How are galaxies distributed in the universe? A galaxy is a collection of billions of stars and gasses being held together by gravity. Name the different types of galaxies and their distinguishing characteristics.
Chapter 1 • Review the components of our solar system – sun, planets, moons, asteroids, comets and their definitions o Star – a large, glowing ball of gas that generates heat and light through nuclear fusion o Planet – a moderately large object that orbits a star; it shines by reflected light. Planets may be rocky, icy, or gaseous in composition o Moon (Satellite) – an object that orbits a planet o Asteroid – a relatively small and rocky object that orbits a star o Comet – a relatively small and icy object that orbits a star o Solar System – a star and all the material that orbits it, including its planets and their moons o Nebula – an interstellar cloud of gas and/or dust o Galaxy – a great island of stars in space, all held together
What is the ‘Big Bang’ theory? What evidence does this theory rest upon and what do you see as the most significant problems facing the Big Bang theory? The Big Bang theory is one of the most widely acclaimed origin stories; however, it continues to face significant problems and brings up questionable implications. The theory states that an inconceivably atom-sized shape appeared and “as it appeared, it began to create space, time, matter, and energy”. Phase changes began as this shape began to expand and cool, resulting in the formation of different types of energy: gravity, electromagnetism, and the ‘strong’ and ‘weak’ nuclear forces.
At the very start, the entire universe was about a size of an atom. It was termed by Georges Lemaitre as the “primordial atom”. As one of the pioneers of in the make of the big bang theory, Georges Lemaitre proposed this new theory. At that time, this theory has explained many difficulties that were met by the theories proposed previously. For example, a theory states that the universe is infinitely large with an infinitely amount of stars was met by the Olber’s paradox.
The theory of Black Holes and its process is one of the most unique studies of the universe, in that with each discovery made, we un-lock closed doors to knowledge of how the universe was made. In 1798 a French Mathematician Pierre Simon de Laplace came up with the first theory of a Black Hole. He agreed with Newton, that when enough mass is added to a star like the sun, the gravitational pull would become so great that the escape velocity would equal the speed of light. Therefore, the star would blink out and become an invisible star. More than a century later, Einstein, came up with the theory of relativity.