NASA’s Roman Telescope Launches to Hunt Dark Matter and New Worlds

At 11.26 Universal Time on August 30th, NASA’s Nancy Grace Roman Space Telescope left the Kennedy Space Centre in Florida aboard a SpaceX Falcon Heavy. Named for NASA’s first chief astronomer, the observatory is now travelling to a holding orbit roughly 1.6m kilometres from Earth, where it will give astronomers an unprecedented view of the universe.

A wide-field camera built for the infrared universe

Two specialist tools will drive the mission. The first is the Wide Field Instrument (WFI), a 300-megapixel camera recording both visible light and infrared.

That sensitivity lets it capture far-off galaxies whose light the expanding universe has shifted into infrared wavelengths. True to its title, the WFI covers an enormous patch of sky — more than 100 times larger than the camera of its original predecessor, the Hubble Space Telescope.

Hunting dark matter and dark energy without seeing them

Strangely, two prime quarry for the WFI will never show up directly in its images. Those are dark matter and dark energy — enigmatic effects betrayed only by how they warp and distend the fabric of spacetime.

Researchers are certain they exist, yet remain unsure of their true nature — though, as context in the mission notes, a particle of dark matter may just have been detected. Using the WFI’s souped-up optics, they will therefore hunt for traces by charting how those cosmic oddities have shaped the universe’s other matter over the course of its history. That mystery recalls a strange blip in an underground detector that could hint at dark matter.

How Roman will find tens of thousands of exoplanets

Exoplanets — planets circling distant stars — are also in the WFI’s sights. Roughly 100,000 of these alien worlds are anticipated from the instrument, vastly expanding the roughly 6,000 now known.

Few will be imaged face-on. Rather, the WFI will watch for tiny dips in the light emitted by distant stars, betraying planets passing in front of them.

Coronagraph will block starlight to reveal Jupiter-like worlds

Catching exoplanets in the act calls for greater finesse. Enter the second device — a coronagraph. It suppresses stellar glare to expose orbiting planets.

As Dmitry Savransky of Cornell University, who works on the instrument, explains, the focus is on bright, nearby stars. A more luminous star allows an orbiting planet to reflect extra light. And by “nearby”, Dr Savransky means within 100 light-years.

Earth-like planets in this neighbourhood are too small and too close to their host stars to see with current equipment. Yet the Roman telescope’s coronagraph might be able to snap pictures of exoplanets similar to Jupiter.

A rocky road to the launch pad

Although the Roman telescope’s trek across space is just starting, reaching the launch pad proved gruelling. In 2025 the Trump administration tried to cut NASA’s science funding by almost 50% and scrap the Roman telescope altogether.

The thousands of scientists who contributed to the mission might be forgiven, then, for feeling a little puzzled when the post-launch news conference was interrupted by Donald Trump himself. Mr Trump congratulated NASA’s scientists on the launch and reminded them: “I’m supplying you all that money.” When mulling future funding cuts, Mr Trump will, with luck, put that money where his mouth is.

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