What the Discovery of Exoplanets Reveals About the Universe | Jessie Christiansen | TED

TL;DR

Discover the incredible journey of a planet hunter at NASA's Exoplanet Archive, from the discovery of zero exoplanets to the exciting potential of finding an Earth-like planet.

Transcript

I am a planet hunter and keeper of the keys at NASA's Exoplanet Archive. In March 2022, we reached a major milestone in space exploration: 5,000 known exoplanets. For thousands of years, we've wondered about planets outside of our solar system, now called exoplanets. But our technology only recently caught up with our imaginations. And yes, 5,000 p... Read More

Key Insights

• 🚀 The number of known exoplanets has reached 5,000, marking a major milestone in space exploration. This opens up new possibilities for understanding the universe and advancing space research.
• 🔭 The technology for discovering exoplanets has only recently caught up with our imaginations. In the past, there were only about 100 known exoplanets, but advancements in technology have allowed us to find thousands more.
• 🔍 Planet hunters like the speaker spend years analyzing data to detect decimal-level changes in the brightness of stars. This method helps identify planets that may have passed in front of the star, blocking some of its light.
• ⭐️ The Kepler Mission, a NASA project, has contributed significantly to the discovery of exoplanets. It enabled scientists to measure stellar brightness with greater accuracy and uncover thousands of exoplanets.
• 🌍 The discovery of exoplanets in our local corner of the galaxy suggests that there may be tens of billions of planets in the Milky Way alone. This opens up possibilities for discovering planets similar to Earth or vastly different from our own.
• 🐶 By categorizing and analyzing data on exoplanets, scientists can begin to identify trends and answer fundamental questions about planetary diversity. This includes determining the prevalence of certain types of planets, such as super-Earths.
• 💫 Studying exoplanets can also provide insights into the formation and evolution of planetary systems. Scientists hope to understand the processes that transform dust and gas into planets and how these planetary systems develop over time.
• 🌌 Discovering Earth-like exoplanets is a major goal for NASA. They are actively researching the possibility of using advanced technology to capture images of these planets and search for signs of life, such as biomarkers.

Questions & Answers

Q: How many exoplanets were known when the speaker began grad school?

When the speaker began grad school, there were around 100 known exoplanets.

Q: How did the speaker search for exoplanets during their grad school?

The speaker spent four years looking at nearly 87,000 stars one by one, measuring their brightness over time in search of decimal-level changes that would indicate the presence of a planet.

Q: What mission did the speaker join in March 2010?

In March 2010, the speaker joined the Kepler Mission, which aimed to search for exoplanets in space.

Q: What kind of planets are considered to be the most common in our galaxy?

According to the speaker, the most common kind of planet in our galaxy, which we do not have in our solar system, is a super-Earth that could be up to twice as big and ten times as heavy as our Earth.

Q: What can be done with the data collected on exoplanets?

With the abundance of data on exoplanets, scientists can start exploring patterns, sorting, grouping, and categorizing them to find trends. This enables researchers to ask fundamental questions like the number of Earth-like or Jupiter-like planets in our galaxy or the possibility of planets orbiting multiple stars.

Q: What are some of the unusual types of exoplanets that have been discovered?

The speaker mentions the discovery of evaporating planets, disintegrating planets, planets in close orbits dancing in a clockwork manner, ultra-puffy planets, and ultra-dense planets – highlighting the incredibly diverse and fascinating range of exoplanets in our galaxy.

Q: What is the speaker's hope for future missions?

The speaker mentions that NASA has been studying the concept of a large telescope in space with next-generation technology. They hope that such a telescope will enable the capture of actual photographs of Earth-like exoplanets and allow the search for biomarkers, which could indicate the presence of life.

Summary & Key Takeaways

• As of March 2022, there are 5,000 known exoplanets, which is a major milestone in space exploration.

• Technology has caught up with our imaginations in finding exoplanets, allowing for the discovery of thousands of planets that are radically different from Earth.

• Continued research on exoplanets can help answer big questions about planetary demographics, planetary formation, and the possibility of finding Earth-like planets with the potential for life.