ther·​mo·​sphere | \ ˈthər-mə-ˌsfir How to pronounce thermosphere (audio) \

Definition of thermosphere

: the part of the earth's atmosphere that begins at about 50 miles (80 kilometers) above the earth's surface, extends to outer space, and is characterized by steadily increasing temperature with height

Other Words from thermosphere

thermospheric \ ˌthər-​mə-​ˈsfir-​ik How to pronounce thermosphere (audio) , -​ˈsfer-​ \ adjective

Examples of thermosphere in a Sentence

Recent Examples on the Web British billionaire Richard Branson inaugurated a new era by traveling to the thermosphere using his Virgin Galactic venture. Jon Sindreu, WSJ, 25 Feb. 2022 The billionaires had locked themselves in a dude-bro cold war, each eager to make history as the very first head of a space tourism brand to hurl himself into the thermosphere. Boone Ashworth, Wired, 18 July 2021 Amateur traders quickly embraced a company that aims to charge $250,000 for a few minutes of weightlessness in the lower thermosphere. Jon Sindreu, WSJ, 11 May 2021 And the thermosphere above is thin enough that air drag doesn’t burn orbiting satellites. Max G. Levy, Wired, 12 Feb. 2021 The company, founded by British billionaire Richard Branson, promises to take six passengers to experience a few minutes of weightlessness in the lower thermosphere in its cutting-edge SpaceShipTwo craft. ... Jon Sindreu, WSJ, 16 Aug. 2020 The team also simulated the thermosphere and allowed the sizes of impact aerosols to change over time. Nola Taylor Redd, Smithsonian Magazine, 27 Apr. 2020 The goal is to figure out the particle makeup of the thermosphere and ionosphere, known as the neutral atmosphere and map its changing temperatures. Richard Tribou,, 26 Jan. 2018 Richard Branson licensed the technology for Virgin Galactic, his space tourism gambit, which aims to start regular visits to the thermosphere by 2012. Carl Hoffman, WIRED, 15 Nov. 2009 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'thermosphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of thermosphere

circa 1950, in the meaning defined above

History and Etymology for thermosphere

International Scientific Vocabulary

Learn More About thermosphere

Time Traveler for thermosphere

Time Traveler

The first known use of thermosphere was circa 1950

See more words from the same year

Dictionary Entries Near thermosphere




See More Nearby Entries 

Statistics for thermosphere

Last Updated

15 Jun 2022

Cite this Entry

“Thermosphere.” Dictionary, Merriam-Webster, Accessed 1 Jul. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on thermosphere Encyclopedia article about thermosphere


Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!