-
- To save this word, you'll need to log in.
main sequence
noun
: the group of stars that on a graph of spectrum versus luminosity forms a band comprising 90 percent of stellar types and that includes stars representative of the stages a normal star passes through during the majority of its lifetime
Examples of main sequence in a Sentence
Recent Examples on the Web
After main sequence, however, stars like ours will run out of hydrogen fuel to burn — which could occur anywhere from about 6 to 7 billion years from now.
—Stephen C. George, Discover Magazine, 18 Apr. 2023
The model that best matched the data found a ratio of 2,000 planets for every main sequence star in the galaxy —billions of stars.
—Mara Johnson-Groh, Discover Magazine, 9 Feb. 2018
In fact, they're considered the smallest main sequence of stars, per NASA.
—Julia Johnson, Washington Examiner, 11 Jan. 2023
That’s about half the main sequence life of the largest stars in our solar neighborhood.
—Bruce Dorminey, Forbes, 27 Dec. 2022
However, most of these are around main sequence stars and red dwarfs.
—The Physics Arxiv Blog, Discover Magazine, 30 Sep. 2022
These types of stars, which are very common in the Milky Way and throughout the universe, are the dimmest and smallest of stars that fuse hydrogen into helium in their cores, known as main sequence stars.
—Sarah Kuta, Smithsonian Magazine, 25 Oct. 2022
In this case, the researchers propose looking at K-dwarfs (a set of relatively cold stars in the main sequence) that are local by astronomy standards.
—Chris Lee, Ars Technica, 17 Jan. 2022
Stars spend a majority of their lives in the main sequence phase.
—Jennifer Leman, Popular Mechanics, 13 June 2020
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'main sequence.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1925, in the meaning defined above
Dictionary Entries Near main sequence
Cite this Entry
“Main sequence.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/main%20sequence. Accessed 2 Oct. 2024.
Kids Definition
main sequence
noun
: a group of stars that form a band on a graph of their color versus their brightness
More from Merriam-Webster on main sequence
Britannica.com: Encyclopedia article about main sequence
Love words? Need even more definitions?
Merriam-Webster unabridged
Share