Two Major Missions Ready to Launch

Friday, February 28, is poised to be a monumental day for space exploration as two significant NASA missions are set to launch from Vandenberg Space Force Base in California. Despite the differences in their spacecraft, both missions share a common goal: cosmic cartography. PUNCH, or the Polarimeter to Unify the Corona and Heliosphere, will map the sun’s dynamics, while SPHEREx, the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer, will map the rest of the universe.

The Science of Unravelling the Universe

The overarching questions these missions aim to answer are profound: “How does the universe work? How did we get here within that universe? And are we alone in that universe?” Shawn Domagal-Goldman, acting director of the Astrophysics Division at NASA Headquarters, emphasized the importance of these inquiries. He noted that answering such questions requires a fleet of missions, each adding unique perspectives to our understanding of the cosmos.

A New Era in Space Exploration

The launch is scheduled for no earlier than Friday at 10:09 p.m. EST (7:09 p.m. local time, and 0309 GMT on March 1). The dual mission will be launched aboard a SpaceX Falcon 9 rocket as part of NASA’s launch services program. This program connects space missions with vetted commercial launch vehicles, enhancing the efficiency and reliability of space launches.

Joe Westlake, director of the Heliophysics Division at NASA Headquarters, underscored the practical benefits for American taxpayers. “It’s a good example of heliophysics catching a ride. It’s going along with the SPHEREx launch and providing continuous value to the American taxpayer by having these two missions go up together,” he said during a recent press conference.

The PUNCH Mission: Solar Explorer

The PUNCH mission consists of four small satellites: three wide-field imagers and a narrow-field imager. Together, they will orbit Earth and create 3D views of the sun’s outer atmosphere, known as the corona, as it transforms into the solar wind that fills the heliosphere. This mission will utilize polarized light patterns, enabling it to reveal the directions of different features within the heliosphere.

I think PUNCH is going to revolutionize our physical understanding of space weather events and how they propagate through the inner heliosphere on their way to the Earth.— Nicholeen Viall, PUNCH mission scientist at NASA’s Goddard Space Flight Center in Maryland.

In terms of practical applications, understanding solar eruptions and their potential to disrupt communications and power grids here on Earth can have significant national security and infrastructure implications. The sun frequently sends out coronal mass ejections (CMEs), which can cause geomagnetic storms. By better understanding the direction and strength of these CMEs, NASA hopes to enhance our ability to mitigate potential disruptions and protect critical infrastructure.

The SPHEREx Mission: Uncovering the Mysteries of Our Universe

The SPHEREx mission has been compared to the James Webb Space Telescope, but while JWST focuses on high-resolution images of specific areas, SPHEREx will take a broader approach. It will provide wide-angle infrared images of the entire night sky, offering a panoramic view of the universe.

Imagin you’re a photographer that wants to capture wildlife in a forest, James Webb does a close-up, whereas SPHEREx does a panoramic.— Shawn Domagal-Goldman.

Phil Korngut, the SPHEREx instrument scientist at the California Institute of Technology in Pasadena, elaborated on the mission’s objectives. “We’re going to produce 102 maps in 102 wavelengths every six months.”

This data will help address key astronomical questions, including cosmic inflation, the evolution of galaxies, and the origins of water and ice in the universe. For instance, understanding cosmic inflation can provide insights into the rapid expansion of the universe just after the Big Bang. Similarly, studying the distribution of water and ice across the cosmos can offer clues about the habitability of other planets, a topic of significant interest to Americans keen on the possibility of extraterrestrial life. Rachel Akeson, the SPHEREx science data center lead at Caltech/IPAC, pointed out, “Where is all the water? On Earth, we know that every living creature needs water to survive, but how and when did that water get here?”

From the Laboratory to the Launchpad: How Did We Get Here?

The PUNCH and SPHEREx missions represent the culmination of years of scientific research and engineering innovation. Researchers have long relied on theoretical models and simulations to understand the sun’s dynamics and the universe’s evolution. The data collected by PUNCH and SPHEREx will provide empirical evidence, refining and expanding our existing knowledge base.

While both missions have been years in the making, they stand on the shoulders of giants like the Solar Terrestrial Relations Observatory (STEREO). The STEREO mission, which includes two spacecraft in different orbits, has previously studied the sun’s ambient solar wind and its interplay with the surrounding space environment. However, the resolution and polarization capabilities of PUNCH are expected to surpass those of STEREO by several orders of magnitude. As Nicholeen Viall noted, “We’re doing 100 times better than what STEREO did, and we’re going and looking over the poles, and that requires a tremendous amount of sensitivity.”

Critical Insights and Potential Applications

The insights gained from these missions will not only deepen our scientific understanding but also have practical applications. Work in fields such as space weather prediction, telecommunications, and national security will greatly benefit from a more comprehensive understanding of solar dynamics and cosmic events. The SPHEREx maps, for example, could help reframe astrobiology, the study of the origin, evolution, and future of life, placing us one step closer to understanding the fundamentals of biology outside Earth.

Addressing the Skeptics: The Value of Public Investment

Some may question the significant public investment required for such missions. However, the benefits of scientific exploration go beyond immediate returns. These missions build our technological capabilities, inspire future generations of scientists and engineers, and sometimes yield unexpected benefits. For example, technologies developed for space exploration have led to countless innovations in everyday life, such as memory foam and lightweight materials. There’s no doubt space exploration makes Earth more secure, prosperous, and the space exploration sector has been a driver of economic growth.

Conclusion

As PUNCH and SPHEREx embark on their missions, these cosmic cartographers bring with them the promise of unlocking the secrets of the sun, the heliosphere, and the universe beyond. The deluge of information they will provide promises to reshape our understanding of the cosmos. February 28, 2025, marks the beginning of a new era in space exploration, one that will undoubtedly keep America at the forefront of cosmic discovery and innovation.