ReThinking: Searching for life on other planets with astrophysicist Sara Seager - Worklife with Adam Grant Recap

Podcast: Worklife with Adam Grant

Published: 2026-02-17

Duration: 30 min

Summary

In this episode, Adam Grant speaks with astrophysicist Sara Seager about her quest to discover exoplanets and the potential for alien life beyond Earth. They delve into Seager's unconventional childhood and how it shaped her scientific curiosity and approach.

What Happened

Sara Seager recalls a formative childhood experience at a star party where she first gazed at the moon through a telescope, sparking her fascination with the vastness of the universe. This early passion for the night sky, coupled with her unique upbringing—where she balanced a distrust of authority from her stepfather with an openness to unconventional ideas from her father—fostered a perfect environment for a career in science.

Seager's research at MIT focuses on exoplanets, which are planets orbiting stars outside our solar system. She explains the importance of detecting these planets through methods such as observing the brightness of stars over time to identify transiting planets. Seager's journey into this field coincided with the initial discoveries of exoplanets in the mid-1990s, a time when the concept was still met with skepticism. She highlights the shift from doubt to certainty in the scientific community regarding the existence of exoplanets, emphasizing the vast number potentially present in our galaxy.

The conversation also touches on the implications of these findings for the search for intelligent life. With trillions of exoplanets estimated to exist, Seager and Grant discuss the probability of alien life forms. While some biologists express caution due to the unknowns of life's origins on Earth, Seager argues that the sheer numbers make it seem unlikely that we are alone in the universe. This leads to a thought-provoking exploration of the intersection of science, philosophy, and the human desire to understand our place in the cosmos.

Key Insights

• Seager's childhood experiences cultivated her scientific curiosity and a unique approach to challenging traditional authority.
• Exoplanets are detected primarily through the method of observing transient drops in star brightness.
• The existence of trillions of exoplanets suggests a high probability for the existence of alien life.
• The scientific community's understanding of exoplanets has evolved from skepticism to acceptance over the decades.

Key Questions Answered

What childhood experiences influenced Sara Seager's career in astrophysics?

Sara Seager discusses how her childhood experiences shaped her scientific curiosity. She had a quirky upbringing, living with her mother and spending weekends with her father, who inspired her with unconventional ideas. This balance of questioning authority and openness to imaginative concepts fueled her passion for science from a young age.

How are exoplanets detected according to Sara Seager?

Exoplanets are primarily detected by monitoring the brightness of stars over time. Seager explains that when a planet passes in front of a star from our viewpoint, it creates a tiny drop in brightness. This method, known as transiting, allows scientists to infer the presence of planets even without spatially resolving the stars.

What is the significance of the number of exoplanets in our galaxy?

Seager emphasizes that there are trillions of exoplanets in our galaxy alone, suggesting that almost every star may have its own planetary system. This vast number raises the intriguing possibility that intelligent life could exist elsewhere in the universe, challenging the notion of human uniqueness.

What skepticism did scientists have about exoplanets when they were first discovered?

When Seager entered the field in the mid-1990s, the existence of exoplanets was met with skepticism. Initially, scientists believed that exoplanets would resemble our solar system, but the discoveries revealed a variety of planetary types that contradicted prior assumptions, leading to a gradual acceptance of their existence.

How does Sara Seager view the role of AI in exoplanet research?

Seager notes that AI has the potential to improve the efficiency of detecting exoplanets by performing tasks more quickly and thoroughly. However, she points out that while AI aids in data processing, it hasn't fundamentally changed the scientific methods used to discover new exoplanets.