21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 15, Problem 7QP
To determine
The meaning of word ‘bipolar’ in astronomy.
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Stars that contract the quickest to land on the zero-age main sequence on the H–R diagram
a.
are the most massive.
b.
are the least massive.
c.
are neither the most massive nor the least massive.
d.
all stars contract at the same rate.
e.
stars similar in mass to the sun.
The dust in the dust clouds in intersteller space consists of?
a. atomic gas
b. molecular gas
c. tiny solid grains
d. pieces of ice ranging from several meters to a kilometer in diameter
A helium flash
a.
is sudden and powerful.
b.
destroys the star.
c.
is a slow expulsion of helium gas.
d.
occurs in very low mass stars.
Chapter 15 Solutions
21st Century Astronomy
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QPCh. 15 - Prob. 2QPCh. 15 - Prob. 3QPCh. 15 - Prob. 4QPCh. 15 - Prob. 5QPCh. 15 - Prob. 6QP
Ch. 15 - Prob. 7QPCh. 15 - Prob. 8QPCh. 15 - Prob. 9QPCh. 15 - Prob. 10QPCh. 15 - Prob. 11QPCh. 15 - Prob. 12QPCh. 15 - Prob. 13QPCh. 15 - Prob. 14QPCh. 15 - Prob. 15QPCh. 15 - Prob. 16QPCh. 15 - Prob. 17QPCh. 15 - Prob. 18QPCh. 15 - Prob. 19QPCh. 15 - Prob. 20QPCh. 15 - Prob. 21QPCh. 15 - Prob. 22QPCh. 15 - Prob. 23QPCh. 15 - Prob. 24QPCh. 15 - Prob. 25QPCh. 15 - Prob. 26QPCh. 15 - Prob. 27QPCh. 15 - Prob. 28QPCh. 15 - Prob. 29QPCh. 15 - Prob. 30QPCh. 15 - Prob. 31QPCh. 15 - Prob. 32QPCh. 15 - Prob. 33QPCh. 15 - Prob. 35QPCh. 15 - Prob. 36QPCh. 15 - Prob. 37QPCh. 15 - Prob. 38QPCh. 15 - Prob. 39QPCh. 15 - Prob. 40QPCh. 15 - Prob. 41QPCh. 15 - Prob. 42QPCh. 15 - Prob. 43QPCh. 15 - Prob. 44QPCh. 15 - Prob. 45QP
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- The gas and dust cocoon surrounding young stars a. is blown away when the young stellar surface heats up and becomes more luminous. b. remains surrounding the young star throughout its adult life. c. eventually collapses onto the star, increasing its mass and luminosity. d. evaporates gradually over the lifetime of the star. e. expands as the star’s luminosity increases eventually reaching a distance far enough that it condenses to form comets.arrow_forwardWhere does gold (the element) come from? A. It is produced during the supernova explosions of high-mass stars. B. It was produced during the Big Bang. C. It is produced by mass transfer in close binaries. D. It is produced during the late stages of fusion in low-mass stars.arrow_forwardBecause of the precession of the Earth’s axis, a. there are four seasons, spring, summer, fall, and winter. b. the Earth receives more solar radiation in the summer than in the winter. c. Polaris will not be the North Star in about 12,000 years. d. the lengths of the Earth’s days and nights vary throughout the year.arrow_forward
- A helium flash occurs a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate electrons in the core do not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. under none of the above conditions.arrow_forwardHow long does it take for energy produced in the Sun's core to reach the photosphere? A. a few seconds B. a few hours O C. a few years D. a few hundred years E. a few hundred thousand yearsarrow_forwardHow does the CNO cycle differ from the proton-proton chain? How is it similar?arrow_forward
- What is the difference between the daily and annual motions of the Sun?arrow_forwardThe energy in Joules per second (J/sec) falling on one square meter is defined as a. absolute visual magnitude (Mv). b. apparent visual magnitude (mv). c. luminosity. d. flux. e. none of these.arrow_forwardAn explosive, although nondestructive, event on the surface of a white dwarf that is part of a binary system results in a a. planetary nebula. b. type I supernova. c. type II supernova. d. nova.arrow_forward
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