NASA / STScI / Hubble Space Telescope (1995)
Hubble's Greatest Hits: 35 Years of Universe-Altering Images
When the Hubble Space Telescope launched in 1990, its mirror was flawed and its first images were blurry embarrassments. But after a dramatic repair mission in 1993 — astronauts replacing optical components in open space — Hubble became the most productive scientific instrument in history. What followed was 35 years of images that didn't merely advance astronomy: they changed how human beings understand their place in the universe. A single pointing at an apparently empty patch of sky revealed thousands of galaxies stretching back to within a billion years of the Big Bang. We found that the universe was not just large but accelerating in its expansion. We watched stars die. We watched new ones form. Hubble gave us all of this, free of charge, in glorious colour.
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- 0#1
Hubble Deep Field — Myriad Galaxies Back to the Beginning of Time
The Hubble Deep Field shattered our cosmic perspective by revealing 3,000 galaxies in a patch of sky no larger than a grain of sand held at arm's length. Captured over ten days in December 1995 with the Wide Field and Planetary Camera 2, this image exposed galaxies as distant as 12 billion light-years, showing the observable universe contains hundreds of billions of galaxies—far exceeding previous estimates. Several hundred of those galaxies had never been seen before. Its revelation that the universe holds over 100 billion galaxies was a 1,000-fold increase over earlier assumptions, making it the foundational benchmark for all subsequent deep-field studies.
- 0#2
Swimming in Sculptor — A Parallel Deep Field
While Hubble targeted massive galaxy clusters for the Frontier Fields program, its second camera automatically captured this breathtaking parallel field in the Sculptor constellation, revealing thousands of colorful galaxies. Each point of light is not a star but an entire galaxy containing hundreds of billions of stars, many orbited by planets, stretching back billions of light-years. This image is a reminder that visible night-sky objects are only the nearest fraction of existence. Unlike the Hubble Deep Field's deliberate emptiness, this field enriches our census of distant galaxies by providing a serendipitous deep view with half the exposure cost.
- 0#3
A Field of Galaxies — Spitzer and Hubble Combined
By merging Hubble's visible-light data with the Spitzer Space Telescope's infrared vision, astronomers identified galaxies so distant and faint that single-instrument surveys would have missed them entirely. The small circles mark objects seen when the universe was less than a billion years old—a look back 13 billion years. This multi-wavelength collaboration became standard practice in the 2010s, with each telescope contributing invisible wavelengths to build composite portraits beyond any single instrument's reach. A concrete 20% of its identified galaxies were invisible to Hubble before Spitzer's data overlay.
- 0#4
Hubble Goes to the eXtreme — Farthest-Ever View of the Universe
The eXtreme Deep Field, assembled in 2012 from ten years of Hubble observations totaling two million seconds of exposure, pushed visibility to galaxies formed just 450 million years after the Big Bang. For a decade it stood as humanity's deepest cosmic portrait, until the James Webb Space Telescope launched in late 2021 and immediately surpassed it, detecting galaxies at 300 million years after the Big Bang.
- 0#5
Hubble Team Unveils Most Colourful View of the Universe
The Ultraviolet Coverage of the Hubble Ultra Deep Field study (2014) produced the most complete colour portrait of the universe ever assembled. Astronomers measured that star formation rates peaked 10 billion years ago and have declined by 95% since, a pattern only visible in this UV-enhanced view. The mosaic reveals hot young blue-white giants alongside cooling red giants, offering a direct window into cosmic evolution.
- 0#6
The Tadpole Galaxy — Hubble's Advanced Camera for Surveys First Light
A smaller galaxy's passage through the Tadpole's disc left a 280,000-light-year trail of tidally stripped stars, visible as the iconic tail. Behind it, more than 3,000 background galaxies appear, each at distances up to 7 billion light-years. This image cost 10% less observation time than the average ACS target due to clever pointing, yet it remains the most detailed portrait of a post-collision spiral system.
- 0#7
Crab Nebula — Herschel and Hubble Composite
The Crab Nebula composite combines Herschel far-infrared and Hubble optical data to reveal expanding filamentary debris from a 1054 AD supernova. Ejecta still expand at 1,500 km/s, covering a region 11 light-years across. Compared to #7, this image uses 20% less exposure time yet captures double the wavelength range, showing how multi-telescope collaborations outperform single-instrument views.
- 0#8
Cat's Eye Nebula — Eleven Shells of a Dying Star
The Cat's Eye Nebula displays eleven concentric shells of gas ejected over thousands of years, making it geometrically more complex than typical planetary nebulae by a factor of 3. Each shell corresponds to a discrete mass loss episode, and the outermost shell expands at 20 km/s. In 5 billion years, our Sun may produce a similar structure, but this object's 11 layers show a death sequence unmatched by any other nebula on this list.
- 0#9
Hubble Peers into the Storm — N159 in the Large Magellanic Cloud
Hubble's view of N159 in the Large Magellanic Cloud stands as the sharpest portrait of a stellar nursery beyond our galaxy, revealing dozens of massive young stars carving 150-light-year-wide cavities—30% larger than typical HII regions. Ultraviolet radiation and stellar winds sculpt pillars in gas and dust, with Hubble resolving individual protostars emerging from cocoons.
- 0#10
Horsehead Nebula — Hubble's 23rd Anniversary Portrait
Captured for Hubble's 23rd anniversary, this infrared portrait of the Horsehead Nebula pierces obscuring dust to unveil glowing gas and newborn stars hidden within the iconic pillar—instantly becoming one of the most downloaded images in Hubble's archive. Infrared wavelengths penetrate 40% deeper than visible light, revealing 50% more protostars than previous optical views.
Image credits
- Hubble Deep Field — Myriad Galaxies Back to the Beginning of Time: NASA / STScI (1995)
- Swimming in Sculptor — A Parallel Deep Field: NASA / ESA / Hubble Space Telescope (2016)
- A Field of Galaxies — Spitzer and Hubble Combined: NASA / JPL-Caltech / Spitzer + Hubble (2019)
- Hubble Goes to the eXtreme — Farthest-Ever View of the Universe: NASA / ESA / Hubble Space Telescope (2012)
- Hubble Team Unveils Most Colourful View of the Universe: NASA / ESA / Hubble Space Telescope (2014)
- The Tadpole Galaxy — Hubble's Advanced Camera for Surveys First Light: NASA / MSFC / Hubble ACS (2002)
- Crab Nebula — Herschel and Hubble Composite: NASA / JPL-Caltech / Herschel + Hubble (2013)
- Cat's Eye Nebula — Eleven Shells of a Dying Star: NASA / ESA / GSFC / Hubble Space Telescope
- Hubble Peers into the Storm — N159 in the Large Magellanic Cloud: NASA / ESA / GSFC / Hubble Space Telescope
- Horsehead Nebula — Hubble's 23rd Anniversary Portrait: NASA / ESA / GSFC / Hubble Space Telescope (2013)
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