Hubble at 35: Ground Control, Gravitational Lensing, and the Future of Space Telescopes

Episode snapshot

NASA's Curious Universe takes listeners behind the scenes of the Hubble Space Telescope to explore how a dedicated ground team at NASA Goddard's Space Telescope Operations Control Center keeps the venerable observatory healthy and pointing precisely at its targets. The hosts and Morgan Van Arsdal recount the teamwork required to command a spacecraft in orbit, the live operations culture, and the way Hubble remains a key data producer long after its 1990 launch. The episode also places Hubble in the broader context of space telescopes, highlighting its ultraviolet capability, its role alongside the James Webb Space Telescope, and the Nancy Grace Roman Space Telescope.

• Hubble maintenance and operations on the STOCK floor
• Servicing missions, instrument upgrades, and the motto boring is good
• Collaboration with JWST and Roman for infrared to ultraviolet coverage
• The Earendel discovery and the power of gravitational lensing

Overview

The podcast introduces Hubble as more than iconic imagery. It frames Hubble as a national asset supported by a dedicated operations team at Goddard Space Flight Center, housed in a facility called the Space Telescope Operations Control Center, or STOCK. Patti Boyd speaks with Morgan Van Arsdal, who oversees the team responsible for keeping Hubble healthy, powered, and properly pointed as it orbits Earth at about 17,000 miles per hour. The conversation emphasizes the human element behind the telescope: the six people certified to send commands to Hubble, the real-time problem solving during anomalies, and the culture that prioritizes careful planning and iterative checks over dramatic interventions. The episode also weaves in historical context about Hubble’s launch, initial flaws, and the long-term servicing program that has kept the telescope at the forefront of space astronomy for 35 years.

Inside STOCK and the Ground Team

The STOCK is described as the one and only place where humans can control Hubble. Morgan Van Arsdal describes her role as deputy operations manager for Hubble, overseeing the team that maintains the telescope’s health and safety, monitoring telemetry, and coordinating with the flight team to issue commands. The team uses a world-spanning map to track Hubble and its communications satellites, ensuring the spacecraft remains aligned with its ground-based reference frame and sun pointing. The scene is set with vivid details of the control room environment, including the hum of monitors, alarms, and the real-time data stream that governs Hubble’s maneuvers and instrument usage.

The Human and the Machine: Operations and Anomalies

The host and Morgan discuss how Hubble is a dual entity: a remarkable telescope and a satellite with rigid orbit and pointing constraints. The crew relies on telemetry data, gyroscopes, fine guidance sensors, sun-tracking sensors, and a magnetometer to maintain precise pointing accuracy. They also note that Hubble’s operations are supported by automated systems that can send text alerts when anomalies occur. A recent morning example is given where one fine guidance sensor had an issue, prompting the team to craft and send corrective commands. The narrative emphasizes routine 9-to-5 operations with automated checks outside of those hours, and it underscores the importance of planning a week in advance to anticipate maneuvers and contingencies.

Hubble’s Legacy and Interplay with New Observatories

A large portion of the discussion centers on Hubble’s enduring value in the era of JWST and the Nancy Grace Roman Space Telescope. The conversation explains how Hubble’s ultraviolet capability remains unique because it cannot be observed from the ground, whereas JWST and Roman operate primarily in the infrared. The team explains that ultraviolet observations provide crucial insight into high-energy processes around young stars and galaxies, complementing infrared observations of older, dust-enshrouded regions. The discussion also touches on how the new generation of space telescopes extends the cosmic view, with Hubble continuing to deliver high-resolution visible and ultraviolet data alongside infrared capabilities from JWST and Roman.

Earendel: A Star in a Gravitational Lens

The podcast pivots to a remarkable scientific achievement: the discovery and naming of Earendel, the most distant individual star observed so far. Brian Welch, an astronomer, explains how Earendel was found using Hubble data and later followed up with James Webb Space Telescope observations. The star’s light has traveled roughly 13 billion years to reach us, placing it in the first billion years of the universe. The host and Welch discuss how Earendel’s study—particularly its mass and metallicity—can illuminate stellar evolution in the early universe and test models of star formation when metals were scarce. The star’s name also nods to Tolkien’s Earendil, which adds a cultural layer to the scientific discovery.

Impact and Future Directions

The episode closes with reflections on Hubble’s impact: its ability to reveal the structure of the universe, from nebulae and star-forming regions to distant galaxies, and its role as a touchstone for public imagination. The discussion highlights the telescope’s longevity, the 1.7 million observations, and the more than 22,000 scientific papers that have used Hubble data. The hosts emphasize the collaborative, multi-telescope future of space astronomy and the ongoing need to protect and leverage Hubble as long as possible. The episode ends with a sense of gratitude for the people who make this national asset possible and for the community of scientists who interpret its data in a transparent, accessible way.