LUOA Earth Science Module 10 Questions and Answers Graded A+

LUOA Earth Science Module 10 Questions and Answers Graded A+ Which type of star emits radio waves? Pulsars Dead stars are ________________ , and they no longer undergo nuclear fusion black dwarfs Stars that appear to pulsate but are non-pulsating are called ___________________. eclipsing binary stars Some stars expand and contract giving off varying intensities of brightness. These are _______________. pulsating stars Stars of average size and average temperature are called _______________. main sequence stars The Hertz-Sprung Russell Diagram uses _____________ as the standard at which every other star is measured. The Sun Our Sun is a _________________________. yellow, main sequence star Rigel, in the constellation Orion, is _________________ and it is _______________. a blue supergiant at the end of its life A red giant needs to be __________________ to be as luminous as a blue giant. large A type of star that is still hot but is running out of fuel for fusion is the __________. white dwarf Protostars are detected by _________________. infrared radiation Stars will remain stable ____________________. as long as the pressure of the gas moving out is the same as the gravity pulling in The mass of Mt Everest can be found in a marble-sized piece of ________________. a neutron star Explain why a neutron star is very dense. Neutron stars are composed almost entirely of neutrons which are particles with no net electrical charge, and weigh a little bit more than a proton. What is the result of a hydrogen fusion reaction? helium How do astronomers find black holes? by their effect of gravity on other objects in space ___________________ have such strong gravity light cannot escape. black holes Nebulas are _________________. clouds of dust and gas The interior of star's core is made up of _____________________ at the end of hydrogen fusion. Fe, Iron The closest star, in distance, to our Sun is _____________________________. Proxima Centauri The nucleus of the galaxy is ____________________. in the center where a large cluster of stars are found Our sun is part of ______________________. the Milky Way The collision of two galaxies results in a(n) ____________________ galaxy. irregular At the center of a galaxy with a quasar you will find ____________________. a black hole powering the quasar The Big Bang is really a ________________ because __________________. model, it can not be proven by the scientific method of experimentation Spiral galaxies make up of about _______________ percent of all known galaxies. 75 Quasi- stellar radio sources are also known as ___________ and emit _____________. quasars radio waves A(n) _______________ galaxy does not have any dust or gas in the center and is round or oval. (Spelling counts) Elliptical The current secular Big Bang Theory says that ______________________. matter appeared simultaneously in all directions at the same time Spiral galaxies ____________________________. have a center cluster of millions of stars with 2 arms