Astronomy Crossword Puzzles: Free Printable and Online

Gaze into the cosmos and uncover the secrets of stars, planets, and galaxies. Explore astronomical phenomena and the pioneers who mapped the universe.

Print any astronomy crossword below, download it as a PDF, or play it online. Free, and no signup is needed to play.

10 puzzles, click Print on any puzzle below

Deep Space Discoveries

Medium · 11×11 · 14 words
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Across

  1. 1. The closest celestial body of its kind to Earth
  2. 2. Nebular formation, or what vaporizes daily on the exoplanet WASP-94A b
  3. 5. Hypothetical life form from beyond our solar system
  4. 6. Acronym for NASA's exoplanet-hunting satellite launched in 2018
  5. 9. Essential instrument for observing distant cosmic phenomena
  6. 10. High-energy electromagnetic radiation emitted by some quasars
  7. 11. Prefix for an exoplanet that is more massive than Earth but lighter than Neptune
  8. 12. European space agency behind the Euclid telescope
  9. 13. The stretching of light to longer wavelengths as galaxies move away from us

Down

  1. 1. Luminous plasma sphere that might host its own system
  2. 3. Cosmic powder that obscures our view of forming planetary systems
  3. 4. The entirety of space, time, and their contents
  4. 7. A world found orbiting a star other than our sun
  5. 8. A 'mini' version of this blue ice giant is a common type of exoplanet

Astronomy

Easy · 7×7 · 7 words
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Across

  1. 1. The most famous dwarf planet in our solar system
  2. 5. The blue gas giant that is farthest from the sun
  3. 6. A piece of glass used in a telescope to see far away

Down

  1. 1. A large round object that circles a star
  2. 2. The vast empty area beyond Earths atmosphere
  3. 3. The star at the center of our solar system
  4. 4. The hottest planet in our solar system

Astronomy

Easy · 7×7 · 7 words
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Printing for a class?

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Across

  1. 2. The vast empty area beyond Earths atmosphere
  2. 4. The windy blue planet furthest from the sun
  3. 5. The space above the Earth where clouds and stars appear
  4. 6. The curved glass part of a telescope

Down

  1. 1. The only planet known to support life
  2. 3. The hottest planet in our solar system
  3. 4. The United States space agency

Space

Easy · 7×7 · 7 words
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Across

  1. 3. A large round object that circles a star
  2. 4. Another name for the entire universe
  3. 7. Relating to the moon

Down

  1. 1. The vast area beyond the atmosphere
  2. 2. The fourth planet known as the Red Planet
  3. 5. The natural satellite that orbits the Earth
  4. 6. A glowing ball of gas in the night sky

Space and Astronomy

Easy · 11×11 · 14 words
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Across

  1. 1. A reusable spacecraft designed for transport
  2. 4. A large round object that travels around a star
  3. 7. The force that pulls objects toward each other
  4. 9. A ball of ice and dust that leaves a long tail
  5. 11. The path one object takes around another in space
  6. 13. The largest planet in our solar system

Down

  1. 1. The vast empty area beyond the Earth atmosphere
  2. 2. All of space and everything in it
  3. 3. A creature from another planet
  4. 5. A small rocky body orbiting the sun
  5. 6. A vehicle used to launch people or satellites into space
  6. 8. The gas giant famous for its visible rings
  7. 10. The fourth planet from the sun often called the Red Planet
  8. 12. The star at the center of our solar system

Astronomy

Easy · 7×7 · 7 words
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Across

  1. 1. What travels from stars to reach our eyes
  2. 5. A large round object that circles a star
  3. 7. The natural satellite that orbits the Earth

Down

  1. 2. A massive system of stars and gas clouds
  2. 3. A tool used to see distant objects in space
  3. 4. The vast area beyond Earths atmosphere
  4. 6. The star at the center of our solar system

Astronomy

Easy · 7×7 · 6 words
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Printing for a class?

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Across

  1. 1. The star at the center of our solar system
  2. 4. A vehicle used to travel into outer space
  3. 5. The fourth planet from the sun known as the red planet

Down

  1. 1. The vast area beyond the atmosphere of the earth
  2. 2. The world on which we live
  3. 3. The planet famous for its bright rings

Astronomy

Easy · 7×7 · 8 words
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Printing for a class?

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Across

  1. 1. The central star of our solar system
  2. 4. The regular path one object takes around another in space
  3. 5. The planet inhabited by humans
  4. 7. The natural satellite that orbits the Earth

Down

  1. 1. The region above us where clouds and stars are seen
  2. 2. A star that suddenly increases in brightness
  3. 3. The visible energy that travels from the stars
  4. 6. A flat and circular band of debris around a planet

Astronomy

Hard · 11×11 · 14 words
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Printing for a class?

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Across

  1. 4. A planet's personal brightness rating, not to be confused with libido
  2. 5. A dying star's dramatic, temporary glow-up
  3. 6. When the sun, earth, and moon line up to win at Scrabble
  4. 7. Optical illusion making close stars seem to dance
  5. 10. Gravity's inescapable groove
  6. 11. Cloudy boundary where long-period comets are born
  7. 12. The horizon of no return

Down

  1. 1. The exact opposite of a peak astronomical experience
  2. 2. Atmospheric gatecrasher that burns up upon entry
  3. 3. Subatomic noble holding the universe's mass
  4. 6. Summer's longest party or winter's shortest gathering
  5. 7. Weightless messenger carrying all the universe's news
  6. 8. When a satellite is feeling most distant and aloof
  7. 9. Halley's famous tail-wagger

Astronomy

Easy · 11×11 · 15 words
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Printing for a class?

Print 2 or 4 versions of this puzzle with different grid layouts, so desk neighbors cannot copy answers. Same words and clues, and each version has its own answer key. Class sets are a Plus feature in the Grid Genius app.

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Across

  1. 1. The vast empty vacuum beyond our atmosphere.
  2. 5. The circular belt of constellations in the night sky.
  3. 6. A person trained and equipped to travel among the stars.
  4. 9. The invisible pull that keeps planets circling the sun.
  5. 12. Another term for the entire known universe.
  6. 14. An icy space object that develops a long glowing tail.

Down

  1. 1. The bright star at the center of our solar system.
  2. 2. A large bowl-shaped dent left by an asteroid impact.
  3. 3. Earth's largest natural satellite that shines at night.
  4. 4. The only known planet to support life.
  5. 7. A large rocky body floating freely between Mars and Jupiter.
  6. 8. A powerful vehicle built to travel beyond the atmosphere.
  7. 10. The famous space mission program that reached the moon.
  8. 11. A group of planets orbiting a central star.
  9. 13. A glowing ball of hot gas in the night sky.

Make your own Astronomy crossword

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Related Printable Crossword Topics

Astronomy Crossword FAQ

Is this Astronomy crossword puzzle free?

Yes. Every Astronomy crossword on this page is free. You can print it, download it as a PDF, or play it online without paying anything or creating an account.

Can I print the Astronomy crossword?

Yes. Click Print on any puzzle for a print-ready page with the grid, the clues, and a name and date line, or use Download to save it as a PDF, PNG, or JPEG for photocopying. The PDF download includes a filled answer key on the last page for grading.

Can students play these crosswords online?

Yes. Every puzzle has a Play online link that opens in the browser on any device. No app install and no signup is needed to play, which makes it easy to share with a class.

Can I make my own Astronomy crossword?

Yes. The free Grid Genius crossword maker builds a puzzle from your own words and clues, with a printable grid and answer key. The Grid Genius app can also generate a complete crossword from any topic you type.