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Pluto Day

Take some time out of your day to celebrate Pluto Day - explore the mysteries of the solar system and discover something new!
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When it is?
February 18
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United States
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Get ready to celebrate Pluto Day on Feb. 18 with a bang! This day is dedicated to the discovery of the dwarf planet, which was first identified in 1930 by astronomer Clyde Tombaugh. Since then, it has been studied and celebrated by scientists and astronomers around the world for its unique characteristics, including its eccentric orbit and mysterious atmosphere. So grab your telescope or binoculars and get ready to join in on all of the fun that comes with celebrating this celestial body!

History of Pluto Day

Pluto Day Dates

Pluto Day Timeline

<div class='timeline-item'><div class='timeline-left'><div class='timeline-date-text'>1930</div></div><div class='timeline-center'></div><div class='timeline-right'><div class='timeline-text timeline-text-title'>Pluto's Discovery</div><div class='timeline-text'>On February 18, 1930, astronomer Clyde Tombaugh discovered Pluto at Lowell Observatory in Flagstaff, Arizona.</div></div></div><div class='timeline-item'><div class='timeline-left'><div class='timeline-date-text'>1978</div></div><div class='timeline-center'></div><div class='timeline-right'><div class='timeline-text timeline-text-title'>Charon Discovery</div><div class='timeline-text'>Pluto's largest moon, Charon, was discovered by astronomer James Christy on June 22, 1978, enhancing our understanding of the distant world.</div></div></div><div class='timeline-item'><div class='timeline-left'><div class='timeline-date-text'>1992</div></div><div class='timeline-center'></div><div class='timeline-right'><div class='timeline-text timeline-text-title'>Kuiper Belt Theory Confirmation</div><div class='timeline-text'>The first object in the Kuiper Belt, a region of the solar system beyond Neptune where Pluto resides, was discovered in 1992, confirming the existence of this theoretical region.</div></div></div><div class='timeline-item'><div class='timeline-left'><div class='timeline-date-text'>2006</div></div><div class='timeline-center'></div><div class='timeline-right'><div class='timeline-text timeline-text-title'>Pluto Reclassification</div><div class='timeline-text'>In August 2006, the International Astronomical Union (IAU) redefined the definition of a planet, leading to Pluto's reclassification as a "dwarf planet".</div></div></div><div class='timeline-item'><div class='timeline-left'><div class='timeline-date-text'>2015</div></div><div class='timeline-center'></div><div class='timeline-right'><div class='timeline-text timeline-text-title'>New Horizons Flyby</div><div class='timeline-text'>NASA's New Horizons spacecraft performed a flyby of Pluto on July 14, 2015, providing the most detailed images and data about Pluto to date.</div></div></div><div class='timeline-item'><div class='timeline-left'><div class='timeline-date-text'>Annually</div></div><div class='timeline-center'></div><div class='timeline-right'><div class='timeline-text timeline-text-title'>Pluto Day Celebration</div><div class='timeline-text'>Every year on February 18, Pluto Day is celebrated to commemorate the discovery of this distant dwarf planet.</div></div></div>

How to Celebrate Pluto Day

<div id='' class='facts-item'><div id='' class='facts-header'><h3 id='' class='facts-number'>1</h3></div><div id='' class='facts-text-wrapper'><h3 id='' class='facts-title'>Visit a planetarium</h3><p id='' class='facts-text'>Take a trip to your nearest planetarium and take in all the wonders of our solar system, including Pluto. Learn about the history of Pluto and its discovery.</p></div></div><div id='' class='facts-item'><div id='' class='facts-header'><h3 id='' class='facts-number'>2</h3></div><div id='' class='facts-text-wrapper'><h3 id='' class='facts-title'>Watch a movie about Pluto</h3><p id='' class='facts-text'>Turn on a movie that focuses on Pluto. Whether it's an animated adventure or a documentary about the dwarf planet, you will learn so much more about this mysterious world.</p></div></div><div id='' class='facts-item'><div id='' class='facts-header'><h3 id='' class='facts-number'>3</h3></div><div id='' class='facts-text-wrapper'><h3 id='' class='facts-title'>Host a Pluto party</h3><p id='' class='facts-text'>Invite friends over for a Pluto themed party. Decorate with images of the dwarf planet, make out of this world snacks, and learn more about this little known solar system inhabitant.</p></div></div><div id='' class='facts-item'><div id='' class='facts-header'><h3 id='' class='facts-number'>4</h3></div><div id='' class='facts-text-wrapper'><h3 id='' class='facts-title'>Read up on Pluto</h3><p id='' class='facts-text'>Do some research and find out more about the fascinating history of Pluto by reading books or searching online.</p></div></div><div id='' class='facts-item'><div id='' class='facts-header'><h3 id='' class='facts-number'>5</h3></div><div id='' class='facts-text-wrapper'><h3 id='' class='facts-title'>Create art inspired by Pluto</h3><p id='' class='facts-text'>Channel your creative energy into something that celebrates the dwarf planet. Draw, paint, or sculpt something inspired by Pluto and share it with the world!</p></div></div>

Why Pluto Day is Important

<div id='' class='whywelove-item'><div id='' class='whywelove-letter-cont'><div class='whywelove-letter'>A</div></div><div id='why-we-love-main-cont'><h3 id='' class='whywelove-title'>It reminds us of our space exploration history</h3><p id='' class='whywelove-text'>Pluto Day is a reminder that the history of space exploration is extremely important. It was on Mars 24, 1930 when Clyde W. Tombaugh discovered Pluto - a historic moment that opened up the door for humanity to explore even further into outer space and understand more about our universe.</p></div></div><div id='' class='whywelove-item'><div id='' class='whywelove-letter-cont'><div class='whywelove-letter'>B</div></div><div id='why-we-love-main-cont'><h3 id='' class='whywelove-title'>It serves as an inspiration for future scientific discoveries</h3><p id='' class='whywelove-text'>The discovery of Pluto back in 1930 proved to be a major stepping stone for humanity's understanding of the universe. Every year, Pluto Day serves as an inspirational reminder to never stop learning and exploring new frontiers in science and technology!</p></div></div><div id='' class='whywelove-item'><div id='' class='whywelove-letter-cont'><div class='whywelove-letter'>C</div></div><div id='why-we-love-main-cont'><h3 id='' class='whywelove-title'>It promotes international collaboration</h3><p id='' class='whywelove-text'>The worldwide celebration of Pluto Day is indicative of how global collaboration and cooperation can lead to amazing research results. It shows that we can achieve astronomically great things together with dedication, enthusiasm, and support from all corners of the globe.</p></div></div>

5 Facts About Pluto You Need to Know

<div class='facts-item'><div class='facts-header'><h3 class='facts-number'>1</h3></div><div class='facts-text-wrapper'><h3 class='facts-title'>Pluto is named after the Roman God of the Underworld</h3><p class='facts-text'>Its name derives from the Latinized form of the Greek god Plouton, who rules over the dead. The name was suggested by an 11-year-old schoolgirl from England.</p></div></div><div class='facts-item'><div class='facts-header'><h3 class='facts-number'>2</h3></div><div class='facts-text-wrapper'><h3 class='facts-title'>Pluto is considered a Dwarf Planet</h3><p class='facts-text'>In 2006, the International Astronomical Union redefined what constitutes a planet, leading to Pluto's reclassification as a "dwarf planet".</p></div></div><div class='facts-item'><div class='facts-header'><h3 class='facts-number'>3</h3></div><div class='facts-text-wrapper'><h3 class='facts-title'>Pluto has five known moons</h3><p class='facts-text'>Pluto's largest moon, Charon, is so large that Pluto and Charon orbit each other around a shared centre of gravity. The four smaller moons are named Nix, Hydra, Kerberos, and Styx.</p></div></div><div class='facts-item'><div class='facts-header'><h3 class='facts-number'>4</h3></div><div class='facts-text-wrapper'><h3 class='facts-title'>A day on Pluto lasts 153.282 Earth hours</h3><p class='facts-text'>Due to Pluto's slow rotational speed, a single day on this dwarf planet is equivalent to over six Earth days.</p></div></div><div class='facts-item'><div class='facts-header'><h3 class='facts-number'>5</h3></div><div class='facts-text-wrapper'><h3 class='facts-title'>Pluto has a heart-shaped glacier</h3><p class='facts-text'>One of the distinguishing features of Pluto is a heart-shaped glacier known as Tombaugh Regio, named after Clyde Tombaugh, the astronomer who discovered Pluto.</p></div></div>

Pluto Day FAQs

When is Pluto Day?

Pluto Day is celebrated on February 18 every year. In 2024 Pluto Day will occur on a Sunday.

Pluto Day Dates



Feb 18



Feb 18



Feb 18



Feb 18



Feb 18


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