dwarf star(redirected from Main-sequence star)
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A star, such as the sun, having relatively low mass, small size, and average or below average luminosity.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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a star with relatively small mass and low or average luminosity, as the sun.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A small star of low mass that gives off an average or below average amount of light. The sun is a dwarf star.
Did You Know? In the world of stars, even a dwarf is quite large. At 864,000 miles in diameter and more than 330,000 times the mass of Earth, our sun is still a dwarf star. But a dwarf star is indeed small compared with certain other kinds of stars, such as red giants. Dwarf stars come in several varieties. The type of star known as a white dwarf is in fact the remnant of a red giant that has burned nearly all its fuel. Because of the gravitational attraction of its atoms for each other, the star starts to collapse in on itself. After it contracts and blows its outer layers away, the red giant ends up as a white dwarf. A black dwarf is a burned-out white dwarf that no longer gives off detectable radiation. Astronomers also refer to brown dwarfs, which are not stars. A brown dwarf is bigger than Jupiter, the biggest planet in our solar system, but too small to carry on the sustained nuclear reactions that are needed to become a true star.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n → Zwerg(stern) m
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