4 syllables: ex, o, pla, net. Stress on pla.
ek-soh-PLAN-it
/ɛksoʊˈplænɪt/
exoplanet is pronounced ek-soh-PLAN-it (/ɛksoʊˈplænɪt/). It has four syllables (ex-o-pla-net), with the stress on "pla". An astronomical term for a planet that orbits a star outside our solar system. The word combines exo- (outside) with planet, and is used in scientific contexts as well as popular science writing to describe planets beyond the Sun’s system. It is a standard term in astrophysics, exoplanet studies, and discovery announcements.
An astronomical term for a planet that orbits a star outside our solar system. The word combines exo- (outside) with planet, and is used in scientific contexts as well as popular science writing to describe planets beyond the Sun’s system. It is a standard term in astrophysics, exoplanet studies, and discovery announcements.
- You may flatten the second syllable too much, making it sound like ex-plannet. To fix, emphasize the second syllable with a clear /əʊ/ or /əʊ/ depending on your accent and then land on /plænt/. - You might not release the t; ensure you have a short alveolar stop at the end. Practice a light but audible /t/ with a crisp release. - Mixing up the middle vowel: keep the 'o' as schwa or /ə/ before the /n/; don’t reduce to a weak vowel or omit it. Use a short, quick glide from /z/ to /ə/ to /n/.
"Astronomers confirmed the first exoplanet orbiting a sun-like star in 1995."
"The field of exoplanet research has expanded rapidly with space telescopes like Kepler."
"Many exoplanets are detected via transits, where the planet passes in front of its star and dims the light."
You pronounce it as /ˌɛɡˈzəʊˌplæːnɪt/ in UK or /ˌɛkˈzɒnəˌplænt/ in US approximations. Commonly you’ll hear ˌɛkˈzɒnəˌplæt in fast speech. The stress pattern places primary stress on the second syllable: ex-o-PLAN-et, with the 'exo' portion reduced in rapid speech. Start with the
Two frequent errors are misplacing stress and slurring the second syllable. First, avoid a flat exo- as in ex-ō-planet; keep the second syllable stressed: e-xo-PLAN-et. Second, ensure the 'planet' portion ends with t rather than a softened d-like sound in some dialects. Finally, don’t reduce the middle vowel too aggressively; keep a clear schwa or /ə/ in the second syllable depending on accent.
In US English, you’ll often hear /ˌɛkˈzɒnəˌplænt/ with less rhotacism and a rounded 'o' in the second syllable. UK English commonly uses /ˌɛkˈsəʊplænɪt/ or /ˌɛkˈzɒnəˌplænɪt/, with a clearer /əʊ/ for the second syllable and strong /æ/ in planet. Australian draws toward /ˌɛkˈzɔːnəˌplæːnt/ or /ˌɛkˈzəʊplænɪt/, maintaining non-rhoticity but sometimes fronting the second syllable vowel. Overall, the main differences are vowel quality in the exo- and the secondary stress placement and the final -et.
The difficulty comes from the 'exo' prefix with varying vowel lengths and the transition into -planet, which contains a schwa or reduced vowel followed by a tense front vowel in planet. Speakers often misplace the primary stress, or fuse the two syllables of exo, creating an indistinct /ɪɡˈzɒnə/ vs. /ɛkˈzɒnə/. The sequence /ˈzɒnə/ can be tricky when the following /plænt/ or /plænɪt/ ends the word. Also, non-native speakers may insert a /d/ or soften the t.
A distinctive trait is the secondary vowel quality shift on the exo- syllable, where some speakers reduce the first syllable and place primary stress on the latter half; crisp articulation of -planet’s /plænt/ or /plænt/ depending on dialect. The word's length and the need to glide from /ɡ/ to /z/ in some pronunciations require careful mouth position—keep the alveolar stop clear, and avoid inserting extra vowels between exo- and planet.
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- US: Rely on rhotic non-rhotic tendencies in careful diction; focus on /ˈzəʊ/ vs /ˈzɒnə/ depending on region; keep /plænt/ crisp and final /t/ released. - UK: Clear /əʊ/ or /ɒ/ in the second syllable; maintain non-rhoticity, making the final /t/ released and audible; keep the schwa in the first monosyllable. - AU: Blend between US and UK; often produce sharper /zɒnə/ or /zəʊ/ in exo; ensure /plænt/ is clean with a lightly aspirated /t/.
Exoplanet derives from the Greek prefix exo- meaning outside, and the noun planet. The exo- element hails from ancient Greek exō, meaning outside or external. Planet itself derives from Greek planetes, literally the wanderer, from planesthai. The combined term exoplanet began appearing in English scientific literature in the late 20th century as detection methods advanced beyond our solar system. By the 1990s, researchers used exoplanet or extrasolar planet to distinguish planets orbiting other stars from the eight solar system planets. The first confirmed exoplanet around a main-sequence star was announced in 1995 (51 Pegasi b), a watershed moment that cemented exoplanet as a standard category. Over the next decades, the term expanded to include diverse planetary types (hot Jupiters, super-Earths, mini-Neptunes) and to describe planets detected by radial velocity, transits, direct imaging, and microlensing. The contemporary usage embeds extensive astrophysical context, habitability discussions, and planetary formation models, with exoplanet becoming a staple term in both scientific discourse and popular science communication.
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Words that rhyme with "exoplanet"
-net sounds
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