NASA’s GUSTO Prepares to Map Space Between the Stars
DEC 18, 2023
On a vast ice sheet in Antarctica, scientists and engineers are preparing a NASA experiment called GUSTO to explore the universe on a balloon. GUSTO will launch from the Ross Ice Shelf, near the U.S. National Science Foundation’s McMurdo Station research base, no earlier than Dec. 21.
GUSTO, which stands for Galactic/Extragalactic ULDB Spectroscopic Terahertz Observatory, will peer into the space between stars called the interstellar medium. The balloon-borne telescope will help scientists make a 3D map of a large part of the Milky Way in extremely high-frequency radio waves. Examining a 100-square-degree area, GUSTO will explore the many phases of the interstellar medium and the abundances of key chemical elements in the galaxy.
In particular, GUSTO will scan the interstellar medium for carbon, oxygen, and nitrogen because they are critical for life on Earth. These elements can also help scientists disentangle the complex web of processes that sculpt the interstellar medium.
While our galaxy brims with billions of stars, including our Sun, that are interesting in their own right, the space between them holds a wealth of clues about how stars and planets are born.
The interstellar medium is where diffuse, cold gas and dust accumulate into gigantic cosmic structures called molecular clouds, which, under the right conditions, can collapse to form new stars. From the swirling disk of material around the young star, planets can form.
GUSTO is unique in its ability to examine the first part of this process, “to understand how these clouds form in the first place,” Chris Walker, principal investigator of GUSTO at the University of Arizona, said. GUSTO is a collaboration between NASA, the University of Arizona, Johns Hopkins Applied Physics Laboratory (APL), and the Netherlands Institute for Space Research (SRON); as well as MIT, JPL, the Smithsonian Astrophysical Observatory, and others.
Eventually, when massive stars die and explode as supernovae, massive shock waves ripple through molecular clouds, which can in turn lead to more stars being born, or simply destroy the clouds. GUSTO can also look at this end stage of the molecular clouds.
GUSTO functions as a cosmic radio, equipped to “listen” for particular cosmic ingredients. That’s because it senses the high-frequency signals that atoms and molecules transmit. The “T” in GUSTO stands for “terahertz” – that’s about a thousand times higher than the frequencies that cellphones operate at.
“We basically have this radio system that we built that we can turn the knob and tune to the frequency of those lines,” Walker said. “And if we hear something, we know it's them. We know it's those atoms and molecules.”
As the telescope moves across the sky, scientists will use it to map the intensity and velocities of the signals from particular atoms and molecules at each position. “Then we can go back and connect the dots and create an image that looks like a photograph of what the emission looks like,” Walker said.
Observations like these can’t be done for carbon, nitrogen, and oxygen from Earth-based telescopes because of the water vapor in our atmosphere absorbing the light from the atoms and molecules in question, interfering with measurements. On a balloon about 120,000 feet above the ground, GUSTO will fly above most of that water vapor. “For the type of science we do, it's as good as being in space,” Walker said.
The GUSTO telescope will also reveal the 3D structure of the Large Magellanic Cloud, or LMC, a dwarf galaxy near our Milky Way. The LMC resembles some of the galaxies of the early universe that NASA’s James Webb Space Telescope is exploring. But since the LMC is much closer than the distant early galaxies, scientists can examine it in greater detail with GUSTO.
“By studying the LMC and comparing it to the Milky Way, we'll be able to understand how galaxies evolve from the early universe until now,” Walker explained.
GUSTO is expected to fly for at least 55 days on a 39 million cubic-foot zero-pressure balloon, a type of balloon that can fly high for long periods of time in the Austral Summer over Antarctica and has the diameter of a football field as it floats.
Antarctica provides an ideal launch location for GUSTO. During the southern hemisphere’s summer, the continent gets constant sunlight, so a scientific balloon can be extra stable there. Plus, the atmospheric zone around the South Pole generates cold rotating air – creating a phenomenon called an anticyclone, which enables balloons to fly in circles without disturbance.
https://science.nasa.gov/missions/scientific-balloons/nasas-gusto-prepares-to-map-space-between-the-stars/