Hubble turns 30 – The images that changed our view of the universe

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  Last updated June 5, 2020 at 5:40 pm

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As the Hubble Space Telescope turns 30, astrophysicist Alan Duffy shares his favourite images and how they changed the way we understand the universe.


The Hubble Space Telescope in orbit

Celebrating its 30th birthday, the Hubble Space Telescope changed our view of the universe. Credit: NASA




Why This Matters: Hubble has shown us the universe in ways we never thought possible.




On 25 April 1990 the Hubble Space Telescope was deployed from the Space Shuttle Discovery. Lifted from the cargo bay, the astronauts onboard, including future NASA Administrator Charles Bolden, unfolded the telescope’s solar arrays and antennae for the first time, before releasing it into orbit.


Hubble 30 Birthday logo gif

Credit: NASA


Then, on 20 May 1990 Hubble took its first images. Already it was showing itself to be 50 percent sharper than ground telescopes. But that wasn’t good enough – investigations found that its primary mirror had a microscopic impefection called a spherical aberration. NASA found that the curvature of the mirror was off by 2 microns, or 1/50th the width of a human hair. That slight imperfection was enough to make the images slightly blurry.


In December 1993 the first Hubble servicing mission SM1 was carried out by astronauts aboard Endeavour. The major goal of this mission was to install two pieces of equipment that corrected for the mirror aberration. The Wide Field and Planetary Camera 2, and Corrective Optics Space Telescope Axial Replacement (COSTAR), provided internal corrections for the Hubble instruments, clearing up the images.


However Hubble wasn’t sitting idle over those years – a range of images and measurements probed the chemistry of the early universe, the aftermath of supernovae, accurate measurements to the nearest galaxy, the material that fuels black holes, and even detailed images of Jupiter.


It was already good, but the fixes made during SM1 made it even better. After its troubled start, Hubble began providing images that revolutionised our understanding of the universe, and blew our minds about the intricacy, and sheer beauty, of the universe.


The Pillars of Creation


Hubble space telescope pillars of creation

Astronomers combined several Hubble exposures to assemble the wider view of the Pillars of Creation. The towering pillars are about 5 light-years tall. The dark, finger-like feature at bottom right may be a smaller version of the giant pillars. The new image was taken with Hubble’s versatile and sharp-eyed Wide Field Camera 3. Click to Zoom. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)


It’s iconic. It’s literally on posters. The Pillars of Creation reveal newly forming stars from cold, dense and even to Hubble’s extraordinary eye, dark clouds of gas stretching over 10 light years in height, all 6500 light years away in the Eagle Nebula in the Orion Constellation.


Sculpted by the intense light and winds from the stars it birth the clouds of gas are blasted away to reveal a glorious range of stars of different sizes and colours.


Hubble eXtreme Deep Field


Hubble xtreme deep field

The Hubble Ultra Deep Field is an image of a small area of space in the constellation Fornax, created using Hubble Space Telescope data from 2003 and 2004. By collecting faint light over many hours of observation, it revealed thousands of galaxies, both nearby and very distant, making it the deepest image of the universe ever taken at that time. Click to Zoom. Credit: NASA, ESA, G. Illingworth, D. Magee, and P. Oesch (University of California, Santa Cruz), R. Bouwens (Leiden University), and the HUDF09 Team


In a seemingly empty patch of sky far smaller than your thumbnail held at arm’s length is revealed by Hubble to be filled with thousands (5500!) of galaxies, stretching billions of light years away and hence billions of years ago in time.


This image underlies the power of Hubble in perfectly capturing the fine details of closer galaxies but also the incredible sensitivity to reveal such faint distant ones.




Teach this: Education resource – Hubble turns 30




The red dots are galaxies so far away that the expanding universe has stretched their colour to longer, ie. redder, wavelengths and mark the dawn of the first galaxies themselves, just a few 100 million years after the Big Bang.


Andromeda


Hubble space telescope Heic1502 Andromeda galaxy M31

This image, captured with the NASA/ESA Hubble Space Telescope, is the largest and sharpest image ever taken of the Andromeda galaxy — otherwise known as M31. Click to Zoom. Credit: NASA, ESA, J. Dalcanton (University of Washington, USA), B. F. Williams (University of Washington, USA), L. C. Johnson (University of Washington, USA), the PHAT team, and R. Gendler.


Our largest neighbour, Andromeda or M31, was painstakingly surveyed by Hubble to form the single largest image ever released, at 1.5 billion pixels.


A new web interface was made by NASA just to allow us to zoom in until you can see individual stars in a galaxy 2.5 million light years from us.


The beauty of the galaxy belies a dark truth, the Milky Way will collide with this galaxy in 5 billion years time. But for now, thankfully, Hubble allows us to enjoy the view entirely safely.


Gravitational lensing


Hubble space telescope Abell370

Abell 370 is one of the very first galaxy clusters in which astronomers observed the phenomenon of gravitational lensing, the warping of spacetime by the cluster’s gravitational field that distorts the light from galaxies lying far behind it. This manifests as arcs and streaks in the picture, which are the stretched images of background galaxies. Click to Zoom. Credit: NASA, ESA/Hubble, HST Frontier Fields, CC BY 4.0


A prediction from Einstein, that massive objects could bend the light around them and focus it like a magnifying glass or lens, was revolutionary yet no one at the time believed it possible to ever see galaxy images be distorted and lensed by other galaxies.


In this image we see just such a hall of mirrors like effect as 4 billion light years away a cluster of galaxies known as Abell 370 and its accompanying, otherwise invisible, dark matter lenses yet more distant galaxies behind.


The distortion of these distant galaxies into arcs and streaks of light allows us to map the gravity, or mass, of the cluster to reveal the dark matter. Hubble is so powerful it can even see fundamentally invisible parts of our universe!


Colliding galaxies


Hubble space telescope heic0615a

This Hubble image of the Antennae galaxies is the sharpest yet of this merging pair of galaxies. As the two galaxies smash together, billions of stars are born, mostly in groups and clusters of stars. The brightest and most compact of these are called super star clusters. Click to Zoom. Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA)-ESA/Hubble Collaboration. Acknowledgement: B. Whitmore (Space Telescope Science Institute) and James Long (ESA/Hubble).


The Antennae galaxies were simply one of the most beautiful images ever captured by Hubble, showing a collision between two galaxies that wrap around each other. The gravity stirring clouds of gas into gigantic new regions of star formation glowing brilliant blue, heating the gas around to glow red, and dust lanes swirling around.


The fragility of galaxies, the dynamic nature of universe, and the colourful beauty of two objects merging to one. How can you not love this image?


A collision that began 200 – 300 million years ago, in an object 45 million light years distant, shows our future as our own Milky Way – Andromeda galaxy collision will be even larger.


Its 30th birthday image


Hubble 30th birthday image

A colorful image resembling a cosmic version of an undersea world teeming with stars is being released to commemorate the Hubble Space Telescope’s 30 years of viewing the wonders of space. In the Hubble portrait, the giant red nebula (NGC 2014) and its smaller blue neighbor (NGC 2020) are part of a vast star-forming region in the Large Magellanic Cloud, a satellite galaxy of the Milky Way, located 163,000 light-years away. Click to Zoom. Credit: NASA, ESA and STScI


Even on its birthday the telescope doesn’t get a day off. NASA have revealed a stunning image of a firestorm of starbirth in a nearby galaxy.


The image captures a view of two nebulae named NGC 2020 and NGC 2014. These nebulae are located 163,000 light years away in the Large Magellanic Cloud , a satellite galaxy of the Milky Way.




What’s your birthday image?


With Hubble exploring the universe for 30 years, there have been amazing images captured every single day. Now, NASA have opened the archives to allow you to find what Hubble saw on your birthday.


The Story of the Hubble Space Telescope




More Like This


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Space pic of the week: Hubble snaps Mars and Saturn’s portraits




About the Author

Alan Duffy
Professor Alan Duffy is an astronomer and physicist at Swinburne University of Technology, Melbourne. He's also lead scientist for Australia's Science Channel. You can find him on Twitter @astroduff.

Published By

Science and technology is as much a part of our cultural fabric as art, music, theatre and literature. They play a significant role in our daily lives, yet, in a world dependent on science, we often take them for granted. Australia’s Science Channel believes every citizen has a right, and a responsibility, to be informed, and our mission is to create programs to bring that about.


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