NASA launches the Hubble Space Telescope, opening a new window on the universe

Story: 1990 C.E.  |  Last updated: April 24, 1990

On April 24, 1990 C.E., a Space Shuttle lifted off from Kennedy Space Center carrying one of the most ambitious scientific instruments ever built. The next day, the Hubble Space Telescope was released into low Earth orbit — and humanity’s view of the cosmos would never be the same.

Key facts

• Hubble Space Telescope: Launched aboard Space Shuttle Discovery on April 24, 1990 C.E., Hubble orbits roughly 340 miles above Earth, entirely outside the distorting effects of the atmosphere.
• Primary mirror: Hubble’s 2.4-meter mirror captures ultraviolet, visible, and near-infrared light — wavelengths that ground-based telescopes cannot observe clearly, or at all, due to atmospheric absorption.
• Scientific output: Over its first three decades, Hubble contributed to more than 19,000 peer-reviewed scientific papers, making it one of the most productive research instruments in the history of science.

A decades-long dream before a single bolt was turned

The idea of a space-based telescope goes back further than most people realize. In 1946 C.E., astronomer Lyman Spitzer published a paper laying out the scientific case for an observatory above the atmosphere. His argument was simple and powerful: no turbulence, no atmospheric absorption, no limit on resolution except the physics of light itself.

The road from that paper to a functioning telescope took more than 40 years. Congress cut all funding for the project in 1974 C.E. NASA strategically zeroed out its own budget request in 1977 C.E. to galvanize the scientific community into lobbying for it — a gamble that paid off. The project was formally approved, then plagued by technical delays and budget overruns. The 1986 C.E. Challenger disaster pushed the launch back further still.

One figure whose role is often underacknowledged in popular tellings is Nancy Grace Roman, the first Chief of Astronomy at NASA and the woman widely called the “Mother of Hubble.” Long before the project had official approval, Roman gave public lectures making the scientific case for it, served as program scientist, established the steering committees that made astronomer needs technically feasible, and personally wrote congressional testimony throughout the 1970s C.E. to keep funding alive. The telescope reached orbit in large part because of her sustained, quiet advocacy.

The flaw that became a story of repair

When Hubble’s first images arrived in 1990 C.E., they were blurry. Engineers quickly discovered that the primary mirror had been ground to the wrong shape — off by just 2.2 micrometers, about one-fiftieth the width of a human hair, but enough to cause significant spherical aberration. For a program that had cost over $1.5 billion, the reaction was swift and brutal. NASA became a punchline.

Three years later, in December 1993 C.E., astronauts aboard Space Shuttle Endeavour carried out one of the most technically demanding repair missions ever attempted. Working in shifts over five spacewalks, they installed corrective optics — effectively giving Hubble a pair of glasses. The fix worked perfectly.

What followed was a rehabilitation that also became a lesson in the value of repairable, upgradeable science infrastructure. Four more servicing missions followed over the next 16 years, each installing new instruments and extending the telescope’s life. Hubble remains in operation today — well into its fourth decade.

What Hubble showed us

The scientific contributions are almost too numerous to compress. Among the most significant: Hubble observations helped establish that the universe is not just expanding, but accelerating in its expansion — a discovery that led to the 2011 C.E. Nobel Prize in Physics and introduced the concept of dark energy to mainstream physics. Hubble also produced the first direct measurement of the current rate of cosmic expansion, known as the Hubble constant, with enough precision to create genuine scientific puzzles that researchers are still working to resolve.

The Hubble Deep Field images — long exposures of seemingly empty patches of sky — revealed thousands of galaxies in regions that had appeared blank to ground-based instruments. Those images fundamentally changed how astronomers understood the scale and structure of the universe. The observable universe contains an estimated two trillion galaxies. Hubble helped make that number real.

Beyond cosmology, Hubble has studied the atmospheres of exoplanets, tracked the seasonal changes on Mars and Jupiter, imaged the death of stars in extraordinary detail, and provided visual evidence for the existence of supermassive black holes at the centers of galaxies. The Space Telescope Science Institute in Baltimore, Maryland, manages Hubble’s science operations — a partnership between NASA and the European Space Agency, which contributed around 15% of the telescope’s construction cost in exchange for guaranteed observing time.

Lasting impact

Hubble did something beyond producing data. It made abstract cosmology emotionally legible. Pillars of creation. Colliding galaxies. The light of stars that no longer exist. These images entered the public imagination and made the universe feel simultaneously vast and knowable.

Its legacy is now embedded in the infrastructure of modern astronomy. The data archive contains over 100 terabytes of observations, freely accessible to researchers worldwide — a model that has shaped how subsequent space observatories share their data. The James Webb Space Telescope, launched on December 25, 2021 C.E., builds directly on Hubble’s scientific foundation, observing primarily in infrared wavelengths and reaching even further back toward the beginning of the universe. The Nancy Grace Roman Space Telescope, named for Hubble’s “mother,” is due to follow in 2027 C.E.

Hubble also demonstrated that international scientific collaboration — and the political will to sustain expensive, long-horizon projects through setbacks — produces results that no single institution acting alone could achieve.

Blindspots and limits

The story of Hubble is sometimes told as a purely American triumph, but the European Space Agency’s financial and engineering contributions were essential from the beginning, and astronomers from dozens of countries have used the telescope’s observing time. The cost of Hubble — and the resources required to maintain it — also reflects a level of sustained government investment in pure science that remains unavailable to most of the world’s research institutions. The questions Hubble has raised, including the precise value of the Hubble constant and the nature of dark energy, remain genuinely unresolved, a reminder that every instrument that expands our view also expands our awareness of what we do not yet understand.

Read more

For more on this story, see: Hubble Space Telescope — Wikipedia

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• The Good News for Humankind archive on space exploration

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