David Bridges
NASA’s SPHEREx Observatory Embarks on a Groundbreaking Two-Year Mission to Map the Celestial Sky
NASA’s SPHEREx observatory has successfully launched into space, marking the beginning of an ambitious two-year mission aimed at creating a comprehensive 3D map of the entire celestial sky. This innovative telescope took off from a launch pad in California atop a Falcon 9 rocket, four years after NASA and SpaceX announced their collaboration on this transformative project. Accompanying SPHEREx are NASA’s PUNCH microsatellites (Polarimeter to Unify the Corona and Heliosphere), designed to study solar phenomena. At precisely 12 AM Eastern time on March 12, SPHEREx separated from the SpaceX launch vehicle and will operate in a stable low Earth orbit, maintaining a consistent position relative to the sun throughout the year to optimize its observational capabilities.
SPHEREx’s Innovative Orbiting Technique Enables Comprehensive Sky Mapping in Just Six Months
Every 98-minute orbit that the observatory completes allows it to capture a 360-degree strip of the sky in both optical and near-infrared light. As the Earth orbits the sun, SPHEREx can capture additional 360-degree strips, enabling it to map the entire celestial sky within just six months. Designed with the capability to image the entire sky twice over two years, SPHEREx aims to produce a detailed 3D map of over 450 million galaxies. Additionally, it will gather critical information on more than 100 million stars located within our Milky Way galaxy, providing a treasure trove of data for astronomers and astrophysicists alike.
Utilizing Spectroscopy, SPHEREx Will Reveal the Colorful Composition of Stars and Galaxies
The map produced by SPHEREx is set to be incredibly vibrant: it will utilize a technique known as spectroscopy to divide the infrared light emitted by stars and galaxies into 102 distinct colors. This process is reminiscent of how a prism splits sunlight into a spectrum of colors, revealing valuable insights about celestial objects. By observing these entities in varying colors, scientists can uncover properties such as their chemical composition and physical characteristics. For galaxies, the color data may help determine their distance from Earth. The wealth of information generated by SPHEREx will also provide crucial insights into the conditions that prevailed shortly after the Big Bang, potentially offering evidence for cosmic inflation, the rapid expansion that characterized the early universe. After shedding its telescope lens’ protective cover in four days, SPHEREx is scheduled to commence its scientific operations in just over a month, once it has sufficiently cooled down.
PUNCH Satellites Will Complement SPHEREx in Mapping Solar Phenomena and Understanding Space Weather
In parallel with SPHEREx, the four PUNCH satellites will also enter a Sun-synchronous orbit, dedicated to mapping the sun’s corona by capturing polarized white-light images. These satellites are tasked with gathering data that will enhance our understanding of how the corona transitions into solar wind, a critical factor in predicting space weather events that can impact spacecraft in Earth’s orbit. By providing detailed insights into solar dynamics, the PUNCH mission will play an essential role in safeguarding our technology and infrastructure from the potentially disruptive effects of space weather.
Daniel Mercer
Brandon Fletcher
