In-Flight STEM Downlinks Expedition 74 proposal period is now closed. Expedition 75 downlink proposal period opens on Wednesday, August 20, 2025 to Wednesday, October 1, 2025.
Please reach out to the Downlinks team at JSC-Downlinks@mail.nasa.gov with questions.

In-flight STEM Downlinks allow participants and facilitators to interact with astronauts onboard the International Space Station. These opportunities are available to both formal and informal U.S.-based organizations.

Expedition 74 In-Flight STEM Downlinks will tentatively occur between Sept. 2025 – March 2026.

To Apply for an In-Flight STEM Downlink visit Apply for a Downlink – NASA.

Upcoming Downlink Events

The following information is subject to change.

May 20, 2025
9:20 a.m. – 9:40 a.m. Central Time (Tentative)
Long Beach Middle School
Lido Beach, New York
Astronauts Nichole Ayers and Takuya Onishi
Watch on NASA STEM’s Youtube channel

May 23, 2025
10:00 a.m. – 10:20 a.m. Central Time (Tentative)
Vermilion High School
Vermilion, Ohio
Astronaut Anne McClain
Watch on NASA STEM’s Youtube channel

May 27, 2025
12:25 p.m. – 12:45 p.m. Central Time (Tentative)
Mobius Discovery Center
Spokane, Washington
Astronaut Anne McClain
Watch on NASA STEM’s Youtube channel

June 9, 2025
9:00 a.m. – 11:00 a.m. Central Time (Tentative)
The Computer School
Manhattan, New York
Astronauts Nichole Ayers and Anne McClain
Watch on NASA STEM’s Youtube channel

June 23, 2025
9:00 a.m. – 11:00 a.m. Central Time (Tentative)
P. S. 71 Elementary School
Ridgewood, New York
Astronauts Nichole Ayers and Anne McClain
Watch on NASA STEM’s Youtube channel

June 27, 2025
10:00 a.m. – 12:00 a.m. Central Time (Tentative)
Douglas Space and Science Foundation, Inc.
Layton, Utah
Astronauts Takuya Onishi and Jonny Kim
Watch on NASA STEM’s Youtube channel

July 1, 2025
9:00 a.m. – 11:00 a.m. Central Time (Tentative)
U.S. Space and Rocket Center
Huntsville, Alabama
Astronauts Jonny Kim and Anne McClain
Watch on NASA STEM’s Youtube channel