How do we know that quasars are very distant objects quizlet? What evidence do we have that quasars are very far away? -Their spectral lines have large redshifts. -Some are gravitationally lensed by distant galaxies. -Some light from quasars contains less...
How are galaxies and quasars related quizlet? They are… Quasars are at the centers of active galaxies. How are galaxies and quasars related? The more massive the galaxy, the more massive the black hole. Are quasars related more to galaxies or...
What do quasars tell us about the evolution of the universe? Quasars provide compelling evidence that we live in an evolving universe—one that changes with time. They tell us that astronomers living billions of years ago would have seen a universe...
How do we know that the cores of quasars are very small? The small sizes were confirmed by interferometry and by observing the speed with which the quasar as a whole varied in output, and by their inability to be seen...
What is gravitational wave explain? “Gravitational waves are ripples in spacetime. When objects move, the curvature of spacetime changes and these changes move outwards (like ripples on a pond) as gravitational waves. A gravitational wave is a stretch and squash of...
How do black hole mergers create gravitational waves? When black holes orbit each other, they emit gravitational waves — essentially gravitational radiation — that carry away energy and angular momentum as they ripple through the fabric of space. These emissions cause...
Which is the instrument built to detect gravitational waves? The Laser Interferometer Gravitational-Wave Observatory (LIGO) is a large-scale physics experiment and observatory designed to detect cosmic gravitational waves and to develop gravitational-wave observations as an astronomical tool. Where are gravitational waves...
What are 3 facts about irregular galaxies? Fact 1- Irregular galaxies are mostly made of hydrogen gas, and this is important for the formation of new stars. Fact 2- Irregular galaxies are thought to have once been elliptical or spiral galaxies...
What are the 4 main classifications of galaxies? The smallest of galaxies contain a “mere” few hundred million stars while the largest galaxies contain up to one hundred trillion stars! Scientists have been able to segment galaxies into 4 main types:...
What are 3 facts about the elliptical galaxy? The largest elliptical galaxies can be over a million light-years in diameter. The smallest “dwarf elliptical” galaxies are less than one-tenth the size of the Milky Way! Elliptical galaxies have very little gas...