'A glorious dawn launch': NASA's newest space telescope has left the Earth

A new NASA space telescope launched Sunday from the Kennedy Space Center in Florida that will help scientists probe the nature of dark matter, dark energy and other mysteries of the universe.

The Nancy Grace Roman Space Telescope, which is about the size of a tour bus, lifted off at 4:26 a.m. PT on SpaceX's Falcon Heavy rocket. The 18,000-pound spacecraft is now on a million-mile journey that will take it to its new home in space.

"What a glorious dawn launch," NASA's Jackie Townsend, Roman telescope project manager, said at a press briefing soon after liftoff. "The ride was magnificent. It put us right where we wanted to be."

More good news came shortly after launch as the telescope began deploying its solar panels and other instruments. "Ground controllers at NASA Goddard have been receiving telemetry data from Roman, and apparently all systems are nominal," said NASA administrator Jared Isaacman.

The journey to Roman's new home

Roman has an unusual origin story: Initially designed as a spy telescope for the National Reconnaissance Office, the spacecraft was donated to NASA instead. The new telescope is named for Nancy Grace Roman, NASA's first chief astronomer who was known as the 'Mother of Hubble' for her championing of the iconic Hubble Space Telescope. Her namesake telescope will have the sharpness of Hubble but a field of view that is at least 100 times larger, allowing it to image huge swaths of the sky at once.

Before it can do that, the Roman Space Telescope will have to get to its new home in the sky about a million miles away. Roman will live at the second Sun-Earth Lagrange point known as L2. There, the competing gravitational pulls of the Earth and the Sun help the telescope keep a steady orbit while using minimal fuel. The James Webb Space Telescope orbits at this point, which gives the spacecraft an unobstructed view of the sky.

"It takes us a good three-plus months to get out there, and we're spending that time checking everything out and doing a whole bunch of calibrations and making sure everything is working the way we know it can," said NASA's Jeremy Perkins, an integration and test scientist on the mission. "It's basically like our time to kick the tires and just make sure that the focus is right, the pointing is right."

Uncovering cosmic mysteries

Roman is on a kind of ghost hunt, searching for more evidence of dark matter — mysterious, invisible stuff whose gravitational influence appears to hold galaxies together and define the overarching structure of the cosmos. Roman will study how gravity subtly affects the path of light along great distances throughout a massive survey of the sky. By doing this, the telescope will help map both normal and dark matter, giving scientists a better understanding of just what this elusive substance might be.

Astronomers will also use Roman's observations to uncover dark energy, the strange force that is believed to drive the expansion of the universe. Scientists' understanding of dark energy comes from observations of a kind of exploding star known as a Type Ia supernova. These supernovas appear to shine at known and predictable brightness throughout the cosmos, giving them the nickname "standard candles." By cataloguing even more of these supernovas, scientists hope to develop a better understanding of how dark energy works, which could fundamentally change the way astronomers view the universe.

Roman will also search for planets outside our solar system. Since astronomers confirmed their existence in the 1990s, more than 6,000 exoplanets have been identified. With Roman, NASA expects to identify more than 100,000 of them by identifying dips in starlight caused by a planet passing in front of its own star. The telescope also hopes to find some 1,000 through microlensing — a technique that searches for tiny changes in background starlight caused by the gravity of a far-off planet.

"Why do we care so much about exoplanets? Because one of our main goals at NASA is answering the question: Are we alone in the universe?" Nicky Fox, NASA's associate administrator of the science mission directive, said at the Sunday morning briefing.

The spacecraft is poised to bring scientists a step closer to answering that question: It will demonstrate technology that can take a picture of a planet by selectively blocking out the light from its home star.

"We are going to make this giant leap forward with the coronagraph technology that is going to allow us to look at these distant worlds and start to really resolve the atmosphere around them to let us know if they could be habitable," she said.

A deluge of data

The telescope will beam back 1.4 terabytes of raw science data each day, using a refrigerator-sized high-gain antenna. The data will be available immediately to scientists and the public.

"Roman's database at the end of its prime mission after five years is going to be bigger than your standard music streaming platform," Perkins said.

Because of the massive amounts of data, NASA is making it available to anyone through a cloud-based system called Roman Nexus. For Perkins, that's what makes this mission unique — anyone can look at the raw data and find new discoveries.

"It's all the things that we are not expecting to see," he said. "It's all these one-in-a-million things that we're going to be able to see with Roman that really excites me."
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