The Planets in Spanish: Solar System Vocabulary Guide

Last Updated on June 9, 2026 by I Love Spanish Club

Whether you’re a student learning Spanish, a parent helping your kids with homework, or simply a space enthusiast — knowing the planets and solar system vocabulary in Spanish is both fun and useful. In this complete guide you’ll learn all 8 planets in Spanish, plus stars, moons, constellations, and essential space vocabulary. ¡Viajemos al espacio! (Let’s travel to space!)

🌍 The 8 Planets in Spanish — Los Planetas del Sistema Solar

#	Spanish	English	Pronunciation	Fun fact
1	Mercurio	Mercury	mehr-KOO-ryoh	Smallest planet — closest to the Sun
2	Venus	Venus	BEH-noos	Hottest planet — called “la estrella de la mañana”
3	La Tierra	Earth	lah TYEH-rah	The only planet with life — “el planeta azul”
4	Marte	Mars	MAR-teh	The red planet — “el planeta rojo”
5	Júpiter	Jupiter	HOO-pee-tehr	Largest planet in the solar system
6	Saturno	Saturn	sah-TOOR-noh	Famous for its rings — “los anillos de Saturno”
7	Urano	Uranus	oo-RAH-noh	Rotates on its side!
8	Neptuno	Neptune	nehp-TOO-noh	Farthest planet — “el planeta más lejano”

💡 Memory trick! To remember the order of planets in Spanish, use this sentence:
Mi Vieja Tía Marta Jamás Supo Una Noticia.
Mercurio — Venus — Tierra — Marte — Júpiter — Saturno — Urano — Neptuno

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🪐 Each Planet in Detail

☿ 1. Mercurio — Mercury

Mercurio es el planeta más pequeño y más cercano al Sol. Un año en Mercurio dura solo 88 días terrestres.
Mercury is the smallest planet and closest to the Sun. A year on Mercury lasts only 88 Earth days.

♀ 2. Venus

Venus es el planeta más caliente del sistema solar, con temperaturas de hasta 465°C. También se llama “la estrella vespertina” o “la estrella matutina”.
Venus is the hottest planet in the solar system, with temperatures up to 465°C. It’s also called “the evening star” or “the morning star.”

🌍 3. La Tierra — Earth

La Tierra es nuestro hogar y el único planeta conocido con vida. Tiene un satélite natural: la Luna.
Earth is our home and the only known planet with life. It has one natural satellite: the Moon.

♂ 4. Marte — Mars

Marte es conocido como “el planeta rojo” por su superficie de color rojizo. Los científicos creen que en el pasado tuvo agua líquida.
Mars is known as “the red planet” for its reddish surface. Scientists believe it had liquid water in the past.

♃ 5. Júpiter — Jupiter

Júpiter es el planeta más grande del sistema solar. Su famosa “Gran Mancha Roja” es una tormenta que lleva más de 350 años activa.
Jupiter is the largest planet in the solar system. Its famous “Great Red Spot” is a storm that has been active for over 350 years.

♄ 6. Saturno — Saturn

Saturno es famoso por sus impresionantes anillos formados por hielo y roca. Tiene 83 lunas conocidas, incluyendo Titán.
Saturn is famous for its impressive rings made of ice and rock. It has 83 known moons, including Titan.

⛢ 7. Urano — Uranus

Urano es único porque rota de lado, como si estuviera “acostado”. Su color azul-verdoso se debe al metano en su atmósfera.
Uranus is unique because it rotates on its side. Its blue-green color is due to methane in its atmosphere.

♆ 8. Neptuno — Neptune

Neptuno es el planeta más lejano del Sol y tiene los vientos más rápidos del sistema solar, con velocidades de hasta 2.100 km/h.
Neptune is the farthest planet from the Sun and has the fastest winds in the solar system, with speeds of up to 2,100 km/h.

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☀️ Solar System Vocabulary in Spanish

Spanish	English
El sistema solar	The solar system
El Sol	The Sun
La Luna	The Moon
Una estrella	A star
Un satélite	A satellite / moon
Un asteroide	An asteroid
Un cometa	A comet
Una galaxia	A galaxy
La Vía Láctea	The Milky Way
El universo	The universe
El espacio	Space / Outer space
La gravedad	Gravity
Un agujero negro	A black hole
Un cohete	A rocket
Una nave espacial	A spaceship
Un astronauta	An astronaut
El telescopio	The telescope
La constelación	The constellation
El eclipse solar	Solar eclipse
El eclipse lunar	Lunar eclipse

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💬 Space Phrases in Spanish

La Tierra es el tercer planeta del sistema solar.	Earth is the third planet in the solar system.
Júpiter es el planeta más grande.	Jupiter is the largest planet.
La Luna orbita alrededor de la Tierra.	The Moon orbits around the Earth.
Los anillos de Saturno son increíbles.	Saturn’s rings are incredible.
Los astronautas viajan en naves espaciales.	Astronauts travel in spaceships.
La Vía Láctea es nuestra galaxia.	The Milky Way is our galaxy.

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💬 Real Conversation: Talking About Space in Spanish

Space is one of those topics that comes up naturally in Spanish conversations — with kids, in class, or even watching a documentary. Here’s how it sounds in real speech:

Conversations like this are great for B1–B2 learners because they naturally use present tense, question forms, and descriptive adjectives. If you want to practice Spanish through topics you genuinely find interesting — like science or space — many tutors on Italki offer themed conversation classes where you pick the topic.

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⚠️ Common Mistakes English Speakers Make

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✏️ Practice Quiz

Match the planet to its description:

1. The largest planet in the solar system → _______
2. The planet with the famous rings → _______
3. The red planet → _______
4. The planet closest to the Sun → _______
5. The only planet with known life → _______

✅ Show Answers

1. Júpiter
2. Saturno
3. Marte
4. Mercurio
5. La Tierra

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❓ Frequently Asked Questions

Are planet names capitalized in Spanish?
Yes — planet names are proper nouns in Spanish and should be capitalized: Mercurio, Venus, la Tierra, Marte, Júpiter, Saturno, Urano, Neptuno.

Is Pluto a planet in Spanish?
Pluto (Plutón in Spanish) was reclassified as a dwarf planet (planeta enano) in 2006 by the International Astronomical Union. So it’s no longer counted among the 8 official planets — in Spanish or any other language!

How do you say “solar system” in Spanish?
El sistema solar — system is sistema (masculine) and solar is the same word in both languages. Easy!

What’s a good way to remember all 8 planets in order?
Use the mnemonic: Mi Vieja Tía Marta Jamás Supo Una Noticia — one word for each planet starting with the same letter. It’s silly, which makes it stick even better! If you want to practice using these words in full sentences, tutors on LingoPie can help you build the science vocabulary you need through real Spanish content.

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📚 Keep Learning

• 👉 Geometric Figures in Spanish
• 👉 Dairy Products in Spanish
• 👉 Describing People in Spanish