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Hubble portrait of Pluto, May 1994
Hubble portrait of Pluto, May 1994 (NASA)
Hubble portrait of Pluto, May 1994
Hubble portrait of Pluto, May 1994 (NASA)
Hubble reveals the surface of Pluto seen for the first time in this March 1996 photo.
Hubble reveals the surface of Pluto seen for the first time in this March 1996 photo. (NASA)
Hubble maps show surface changes on Pluto in this photo taken in February 2010.
Hubble maps show surface changes on Pluto in this photo taken in February 2010. (NASA)
Another moon was discovered around Pluto in images taken by Hubble in July, 2011.
Another moon was discovered around Pluto in images taken by Hubble in July, 2011. (NASA)
New Horizons snapped its first Pluto-Charon color image in April 2015.
New Horizons snapped its first Pluto-Charon color image in April 2015. (NASA)
New Horizons snapped a few more "faces" of Pluto as it approached on June 11, 2015.
New Horizons snapped a few more "faces" of Pluto as it approached on June 11, 2015. (NASA)
By late June, New Horizons was about 29 million miles away from Pluto, and able to make out distinct features on the hemispheres.
By late June, New Horizons was about 29 million miles away from Pluto, and able to make out distinct features on the hemispheres. (NASA)
In early July, New Horizons was able to spot a continuous swath of dark terrain wrapping around the dwarf planet's equator.
In early July, New Horizons was able to spot a continuous swath of dark terrain wrapping around the dwarf planet's equator. (NASA)
This color version of a New Horizons picture of Pluto taken July 3, 2015, was created by adding color data from the Ralph instrument gathered earlier in the mission. The craft was 7.8 million miles away.
This color version of a New Horizons picture of Pluto taken July 3, 2015, was created by adding color data from the Ralph instrument gathered earlier in the mission. The craft was 7.8 million miles away. (NASA)
Pluto's "heart" first appeared in this July 11, 2015, image.
Pluto's "heart" first appeared in this July 11, 2015, image. (NASA)
By July 9, New Horizons was showing signs of geology on Pluto. The craft was 3.3 million miles away.
By July 9, New Horizons was showing signs of geology on Pluto. The craft was 3.3 million miles away. (NASA)
New Horizons spotted more strange spots in this July 11, 2015, photo.
New Horizons spotted more strange spots in this July 11, 2015, photo. (NASA)
This false color composite was made to show the differences surface material. The western lobe, shaped like an ice-cream cone, appears peach color in this image. A mottled area on the right (east) appears bluish. Even within Pluto's northern polar cap, in the upper part of the image, various shades of yellow-orange indicate subtle compositional differences.
This false color composite was made to show the differences surface material. The western lobe, shaped like an ice-cream cone, appears peach color in this image. A mottled area on the right (east) appears bluish. Even within Pluto's northern polar cap, in the upper part of the image, various shades of yellow-orange indicate subtle compositional differences. (NASA)
This New Horizons shot shows off Pluto's "heart" in full color. The spacecraft was just over half a million miles away from the dwarf planet on July 13, 2015. The "heart" measures approximately 1,000 miles across.
This New Horizons shot shows off Pluto's "heart" in full color. The spacecraft was just over half a million miles away from the dwarf planet on July 13, 2015. The "heart" measures approximately 1,000 miles across. (NASA)

The New Horizons spacecraft will still be sending back its images for months to come, but what we already have is already inspiring awe around the world. Through the Hubble Space Telescope and now the Horizons images, here's how our visual knowledge of the dwarf planet have changed over the last 21 years.

Keep up to date with the latest images at nasa.gov.

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