[Feb. 22, 2022]

The lecture videos of the ELSI Annual Public Lecture 2022 'From Deep Earth to Deep Space' have been published on the ELSI YouTube channel.

Please access below.


Exploring the Origin of the Earth from its Metallic Core by Professor Kei Hirose (ELSI Director)  https://youtu.be/XHvvKrTEDtA


Forefront of Solar System Life Exploration by Professor Yasuhito Sekine (ELSI Vice Director)  https://youtu.be/6hRsr68aTxQ



ELSI Annual Public Lecture 2022 will be held on Wednesday, January 19, 2022. The event will feature ELSI's Director, Prof. Kei Hirose and ELSI's Vice Director, Prof. Yasuhito Sekine.




Date and time: January 19, 2022 (Wednesday), 19:00-21:00

Participation: Live stream

Lecture theme: From Deep Earth to Deep Space

Organiser: Earth-Life Science Institute (ELSI)

Lectures and lecturers:

Kei Hirose (Director/Professor, ELSI)

Yasuhito Sekine (Vice Director/Professor, ELSI)

Moderator: Takashi Sakurai (Administrative Director, ELSI)

Fee: Free (prior registration required)

Registration deadline: January 19, 2022 (Wed.), 12:00 PM (Noon)




Contact: pr@elsi.jp




Lecture 1

Exploring the Origin of the Earth from its Metallic Core


Kei Hirose (Director/Professor, ELSI)






The Earth's core contains impurities other than iron, and recent studies revealed that hydrogen is the major impurity. While a large amount of water was delivered to growing Earth, most of it was incorporated into the core in the form of hydrogen. Therefore, our planet avoided deep sea but instead provided a diverse environment in which sea and land coexist, which may have been important for the origin of life.




Kei Hirose is an expert on Earth's interior. In 2004, he and his team made the first discovery of a main mantle mineral in 30 years, "post-perovskite," in a few-100-km thick layer near the mantle's base. This discovery expanded the understanding of what has long been the most enigmatic region inside the Earth.




Lecture 2:

Forefront of Solar System Life Exploration


Yasuhito Sekine (Vice Director/Professor, ELSI)







Is there life beyond Earth in the Solar System? Thanks to recent space explorations, we now know that Mars was once an aquaplanet, possessing lakes and oceans on the surface. In the interior of icy moons of Jupiter and Saturn, there are liquid oceans, called subsurface oceans. In my talk, I will introduce these advances in the space explorations and how to find life there.



Yasuhito Sekine is a principal investigator and a professor at ELSI. His expertise is in the origins and evolution of both planetary atmospheres and oceans and the habitability in the Solar System. He revealed the presence of on-going hydrothermal systems in Saturn’s moon, Enceladus, in 2015. 



Takashi Sakurai (Administrative Director, ELSI)







ELSI Annual Public Lecture 2022 Flyer

(To download PDF of the flyer, please click here)









Ask A Scientist!

Let’s ask questions to scientists at the ELSI Annual Public Lecture 2022!

Submit your questions by Dec 17 (Fri.)

(*The question should be in Japanese*)

Do you have questions you would like to ask world-reading scientists? Please send questions to the lecturers using the form (click here). The lecturers will answer some of them during the ELSI Annual Public Lecture 2022. Please submit only one question. The deadline is December 17 (Fri.). We look forward to receiving many questions!

Please note that the questions may be published with the answers on the ELSI website and/or on Q&A booklet later.





(Credit for photos: Nerissa Escanlar / ELSI)