Dark matter and dark energy make up 95% of the universe. Humanity has never directly detected either. The Nancy Grace Roman Space Telescope, named for NASA’s first chief of astronomy and the first woman to hold an executive position at the agency, recently reached a milestone: it is complete.
At NASA’s Goddard Space Flight Center in Maryland, scientists and engineers gathered to celebrate the observatory’s moment of achievement while its clean-room lighting displayed the observatory’s beauty before its upcoming mission.
NASA Nancy Grace Roman Space Telescope
The main mirror of Roman is also comparable to that of Hubble in size, with a diameter of about 7.9 feet. However, the differences between the two objects appear when the second identical feature is considered. As explained by Jared Isaacman, the head of NASA, the period taken by Hubble to image an object can be done within a year by Roman, which means the latter works 1,000 times faster compared to Hubble while having 200 times wider photos of the sky.
Hubble has been in operation since 1990 and has collected about 400 terabytes of scientific data in its 35-year lifetime. Roman, on the other hand, is estimated to generate 500 terabytes of scientific data per year after it becomes operational.
Roman’s Wide Field Instrument is a 300-megapixel visible-to-near-infrared camera equipped with a slitless spectrometer with image sizes 50 times wider than those of the James Webb Space Telescope. This is necessary since the instrument uses the wide coverage space to accomplish its mission of monitoring the skies and detecting fast celestial events that would go unnoticed by smaller telescopes.
That includes fast radio bursts, neutron star collisions, and supernovae. According to Space.com, program scientist for the Roman telescope Dominic Benford said, “We’re going to see thousands of supernovae, and some of these are going to be further away than any supernovae we’ve ever seen before.” “We’ll trace the history of the universe through exploding stars.”
The wide-field approach lets Roman create detailed three-dimensional maps of galaxy distributions which scientists use as a primary tool to investigate how dark matter affects the structure of the universe.
Dark matter and dark energy, which exist in the universe, represent the most fundamental elements of existence because they make up 95% of all matter and energy in the universe. The scientists have never seen either of these two phenomena through direct observation. Scientists use dark matter to explain how galaxies maintain their structure despite violating established physical laws, and they use dark energy to explain the universe’s increasing speed of expansion.
Roman’s sweeping view of the sky gives it a practical advantage in this hunt. By imaging vast numbers of galaxies rapidly, it can track how those galaxies cluster and how cosmic expansion has shifted over time, the two observational handles scientists have on the dark universe.
“We’ll study how the universe itself has expanded over time,” said Julie McEnery, Roman’s senior project scientist. “These are the keys to unlocking the fundamental nature of dark matter, dark energy, and the fabric of the universe itself.”
Roman is expected to be launched into space using a SpaceX Falcon Heavy vehicle that has completed eleven successful missions thus far. Roman is going to head for Lagrange Point 2, which is about a million miles away from the planet in an orbit along with the James Webb Space Telescope, where it is going to remain cool from sunlight while being in constant communication with mission control.
Until then, however, Roman would need to go through further tests and ship out to Kennedy Space Center at NASA in Florida. Once those steps are cleared, Roman carries with it a coronagraph capable of imaging planets 100 million times fainter than their host stars, a capability 100 to 1,000 times beyond any existing space coronagraph, and a tool that could produce the first direct images of Jupiter-like worlds orbiting distant suns.
The most significant discoveries from Roman, McEnery suggested, may not yet have names. “The most exciting science from Roman is going to be the things that we didn’t expect, that we couldn’t predict.”
