A high luminosity star - Study guides, Class notes & Summaries

Which of the following relationships is the key to nuclear reactions in a star's core remaining under control? a. Luminosity depends on mass. b. Pressure depends on temperature. c. Density depends on mass. d. Weight depends on temperature. - b What is opacity? a. the balance between the pressure and force of gravity inside a star b. the force that binds protons and neutrons together to form a nucleus c. the temperature and density at which a gas will undergo thermonuclear fusion d. a...

Test Bank for Foundations of Astronomy, 14e 14th Edition by Michael A. Seeds, Dana Backman. Full Chapters test bank included Part 1: Exploring the Sky Chapter 1: Here and Now 1-1 Where Are We? 1-2 When Is Now? 1-3 Why Study Astronomy? Chapter 2: A User's Guide to the Sky 2-1 Stars and Constellations 2-2 The Sky and Celestial Motions 2-3 Sun and Planets 2-4 Astronomical Influences on Earth's Climate Chapter 3: Moon Phases and Eclipses 3-1 The Changeable Moon 3-2 Lunar Eclipses...

Space Exploration|Complete Questions with A+ Graded Answers main sequence a diagonal area on an H-R diagram that includes more than 90 percent of all stars white dwarf A small, hot, dim star that is the leftover center of an old star Luminosity the true brightness of an object light year the distance light travels in one year blueshifted the doppler shift toward shorter wavelengths of light from an approaching object Redshifted stars moving away from Earth Ne...

Cygnus x-1 - correct answer A powerful x-ray source that is believed to be a black hole in our galaxy Virgo Cluster - correct answer Nearest large cluster of galaxies to our local group SBb - correct answer assignment given to a galaxy with moderately sized nuclear bulge & moderately wound arms starting from a bar through the central part of the galaxy That of an average city, about 10km - correct answer the diameter of a typical neutron star of 1 solar mass is predicted to be approxima...

Astro 1 Exam 3 | 100 Questions And Answers | Verified 100% Correct | Latest Update 2024 What are sunspots? - ANSWER -slightly cooler regions on the sun's surface What causes sunspots? How long are their cycles? - ANSWER -magnetic activity preventing hot material from rising to that region. They have 11 year cycles What comprises helium-4? What does it release? What is it called? - ANSWER -4 protons combine to make helium-4 (2 protons, 2 neutrons); produces gamma rays; it is called ...

Astro 7n Exam 2 Questions With Complete Solutions Graded A+

Astronomy 1010 Final HW One of the most important earlier steps in understanding stars was to group them into classes called spectral types that could offer clues as to why they are different from one another. Shown here are spectra of some main-sequence stars. Before stars were very well understood, they were classified into an order that was based on the relative strength of hydrogen absorption lines, marked by arrows the image shown. Look at the spectra for stars of different spectral ...

Astro 102 Final Exam Ultimate Study Guide | 100% Correct Answers | Verified | Latest 2024 Version What are the characteristics of disk stars (yellow) of the Milky Way Galaxy? - High mass stars, the Sun, youngest stars, and stars that all orbit in nearly the same plane What are the characteristics of halo stars (green) of the Milky Way Galaxy? - Globular clusters, oldest stars, stars whose orbits can be inclined at any angle, and stars with smallest abundance of heavy elements. What are t...

Synchrotron radiation is produced by - high-velocity electrons moving through a magnetic field A Type la supernova is believed to occur - when a white dwarf exceeds the Chandrasekhar limit The material that accretes onto a neutron star or black hole is expected to emit x-rays because - the material will become hot enough that it will radiate most strongly at x-ray wavelengths. A planetary nebula - produces an emission spectrum. The main sequence has a lower limit because - there is a...

Astronomy 102 Final Exam | 100% Correct Answers | Verified | Latest 2024 Version To find the most accurate distance to a nearby star using parallax, astronomers could compare the view of the star against the background stars at what times of the year? - In January and July Which of the following correctly expresses the distance to a nearby star? - 1.3 parsecs Consider two stars (Y and Z) that both exhibit parallax. Star Z appears to move back and forth against the background stars by a gre...