AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS (AAVSO)

International nonprofit organization and world leader in variable star research, with a mission to enable anyone to participate in scientific discovery.

• Museums & Museum Activities

• 92.

Space Museum

Explore the history of spaceflight at the most comprehensive space history museum in Missouri.

• Astronomy (includes Observatories)

• 93.

Tmt International Observatory LLC

TMT is a next-generation observatory committed to supporting community-based astronomy through respect, inclusion and community stewardship.

• Eye Diseases, Blindness & Vision Impairment

• 94.

Huntsville Electro-Optical Society

THE OBJECTIVE OF HUNTSVILLE ELECTRO-OPTICAL SOCIETY SHALL BE TO STIMULATE AND TO FACILITATE THE KNOWLEDGE AND INNOVATION OF OPTICS AND PHOTONICS, PROMOTE THE MUTUAL INTERESTS OF ITS MEMBERS, AND TO ENCOURAGE FREE DISCUSSIONS OF SCIENCE AND ENGINEERING AMONG ITS MEMBERS AND THE PUBLIC.

• Astronomy (includes Observatories)

• 95.

Michiana Astronomical Society Inc

Michiana Astronomical Society Imporant News MSP15 2025 Star Party Michiana Star Party 2025 Dates 2025 Dates are Oct 23rd 26th 2025 For details forthcoming soon Notice Standard Covid19 precautions will be observed per current CDC and local government requirements.

NWA Space and Science, Inc.

Supporting S. T. E. M. & Space in NW Arkansas: a community of visionaries raising awareness for S.

Harbor Heritage Society

Great Lakes Science Center, home of the @NASAGlenn Visitor Center, makes science, technology, engineering & math come alive.

CALIFORNIA ASSOCIATION FOR RESEARCH IN

The W. M. Keck Observatory operates the two largest, and among the most scientifically productive telescopes on Earth Up Above the World So High Discover how far your curiosity will take you Navigate New Horizons Exploring the local and distant Universe from the worlds largest and most scientifically productive telescopes on Earth.

Planetary Science Institute

PSI is a private nonprofit dedicated to studying the origin, characteristics, and evolution of Earth, our Solar System, and planetary systems around other stars The Planetary Science Institute is a private nonprofit 501(c)(3) corporation dedicated to studying the origin, characteristics, and evolution of Earth, our Solar System, and planetary systems around other stars.