CAPE CANAVERAL, Fla., Aug 30 – NASA has sent its newest major space observatory into space on an ambitious mission to investigate some of the universe’s most difficult mysteries, from planets orbiting distant stars to the unseen forces believed to control the expansion of the cosmos.
The Roman Space Telescope lifted off Sunday aboard a powerful SpaceX Falcon Heavy rocket from Kennedy Space Center shortly after sunrise. The $4.3 billion observatory began a journey toward a point roughly 1 million miles, or 1.6 million kilometers, from Earth, where it will eventually operate alongside NASA’s James Webb Space Telescope.
Named after Nancy Grace Roman, NASA’s first chief astronomer, the bus-sized observatory is expected to transform how scientists survey the universe. Roman is designed to observe enormous portions of the sky at once, allowing researchers to locate distant galaxies, stars, supernovae and planets at a pace that existing space telescopes cannot match.
The telescope will spend more than three months traveling to its destination before beginning its main scientific work. Once operational, scientists expect it to provide an exceptionally broad view of the cosmos while helping answer fundamental questions about how the universe formed, evolved and continues to change.
NASA science mission director Nicky Fox described the scale of the mission as unprecedented. She said Roman could identify thousands of supernovae, tens of thousands of planets, billions of galaxies and tens of billions of stars, opening opportunities for discoveries that have previously been beyond the reach of astronomers.
A Wider View of the Universe
One of Roman’s most important advantages will be its enormous field of view. Its view of the sky will be more than 100 times wider than that of the Hubble Space Telescope, which has been observing the universe for decades and remains one of NASA’s most successful scientific instruments.
Hubble has provided detailed images of individual cosmic objects and regions, but Roman is being designed for a different purpose. Rather than concentrating primarily on a relatively narrow section of the sky, it will be capable of surveying huge areas rapidly.
The James Webb Space Telescope, which joined Hubble as another major space observatory, is particularly powerful when scientists need to examine distant objects in extraordinary detail. Roman will complement Webb by finding large numbers of interesting targets across much broader areas of space.
Scientists expect the two observatories to work together. Roman can conduct large surveys and identify unusual or potentially important objects, while Webb can then focus on selected targets for closer examination.
Senior project scientist Julie McEnery said Roman’s ability to cover vast regions of the sky will help astronomers locate objects that are rare, strange or difficult to find. The telescope, she said, will change the challenge of searching for a tiny object in an enormous universe.
That capability could be especially valuable in the search for planets outside our solar system. Roman will survey distant stars and look for signs of planets orbiting them. Some of those worlds may be unlike anything scientists have encountered before.
Once Roman identifies promising targets, more sensitive instruments such as Webb could be used to investigate them in greater detail. This combination could provide scientists with a more complete picture of distant planetary systems.
Roman will also provide an unprecedented survey of the Milky Way. Its ability to rapidly scan the crowded central region of our galaxy could give astronomers their deepest broad-scale look yet at the galactic bulge.
McEnery said observations that would require Hubble roughly a century to complete could potentially be carried out by Roman in about a month. The comparison highlights the telescope’s central strength, its ability to gather enormous amounts of information quickly.
Roman’s primary wide-field infrared camera will have sensitivity comparable to Hubble while operating at a much faster pace. Infrared observations are particularly useful for studying objects and regions that are difficult to observe in visible light.
Another instrument aboard the spacecraft could push planetary research even further. Roman carries an experimental coronagraph designed to suppress the intense light coming from stars. By blocking or reducing that glare, scientists hope to directly observe faint planets that otherwise could be hidden in the brightness of their parent stars.
The instrument essentially creates an artificial eclipse, giving researchers an opportunity to test techniques that could eventually become important in the direct study of distant worlds.
Beyond the search for planets, Roman has another major scientific objective: investigating dark matter and dark energy.
Together, dark matter and dark energy are believed to account for most of the universe, yet neither can be directly seen in the conventional sense. Scientists infer their existence from their effects on galaxies, cosmic structures and the expansion of the universe.
Roman will build a massive catalog of galaxies and other astronomical objects. Researchers can use those observations to study how structures have changed over cosmic time and determine how rapidly the universe has been expanding.
Those measurements could help scientists better understand dark energy, the mysterious component associated with the accelerating expansion of the universe.
Roman will not work alone. Its observations are expected to complement those from Hubble and Webb, as well as the European Space Agency’s Euclid spacecraft and the Vera C. Rubin Observatory in Chile, operated by the National Science Foundation.
Together, these observatories will examine the universe at different scales and wavelengths. Their combined observations could provide scientists with a much more detailed understanding of cosmic evolution.
The launch itself also marked an important moment for NASA and SpaceX. The Falcon Heavy carried Roman into orbit with three powerful booster cores. Several minutes after liftoff, the two reusable side boosters returned to Cape Canaveral, landing tail-first and producing loud sonic booms as they came back to Earth.
Fox watched the dramatic landing and became emotional during the successful sequence, calling it an especially memorable day for the mission.
Roman’s development has also been notable for its timing. The telescope is launching nearly a year earlier than previously expected while remaining within its planned budget.
Its name carries particular significance for NASA. Roman was the agency’s first chief astronomer and joined NASA in 1959, when the organization was still in its early years. She strongly supported placing observatories above Earth’s atmosphere, where atmospheric interference does not limit their ability to observe distant objects.
Her advocacy helped establish the scientific importance of space-based astronomy. NASA later honored her legacy by naming this major observatory after her.
Retired NASA scientist Ed Weiler, who was hired by Roman in 1978, helped popularize the description of her as the “Mother of Hubble.” He said the telescope bearing her name represents a fitting recognition of her contribution to space astronomy and the questions it is now designed to investigate.
Roman died in 2018 at the age of 93. The telescope is NASA’s first space telescope to be named after a woman.
There is also an unusual connection between Roman and Hubble. Both observatories have primary mirrors measuring nearly 8 feet, or 2.4 meters, across. Roman’s mirror, however, has a distinctive history. It was originally built for another purpose and was later donated to NASA by the National Reconnaissance Office.
More than a decade ago, the National Reconnaissance Office provided NASA with two surplus spy satellite mirrors. One was eventually selected for Roman, while the other remains in storage.
Roman’s mission is expected to last for years, and its design includes another unusual feature. The spacecraft was built with the possibility of being refueled. If robotic spacecraft capable of servicing and refueling observatories become available in the coming decade, Roman’s operational life could potentially be extended.
For now, scientists are focused on the journey ahead. Once Roman reaches its observation point and begins surveying the sky, it will start building one of the largest collections of astronomical observations ever assembled from space.
Its mission is not simply to photograph distant galaxies or discover new planets. By mapping enormous portions of the universe and measuring how cosmic structures change over time, Roman could help scientists investigate questions that have remained unanswered for decades.
The telescope’s greatest contribution may ultimately come from objects and phenomena that astronomers do not yet know exist. With its unusually wide view and rapid survey capabilities, Roman is designed to search a vast universe for the unexpected, potentially revealing discoveries that reshape humanity’s understanding of the cosmos.