Two astronomers tried to answer this question during a live debate in 1920. At 8:15 pm on Monday, April 26, 1920, two men took to the stage of the Baird Auditorium in the Smithsonian’s National Museum ...

Chat with astronomer Rodolfo Montez Jr. Ask questions about the beautiful death throes of Sun-like stars and the ultimate fate of the Sun.

The beautiful, but skewed, spiral galaxy NGC 1961 is about 190 million light-years from Earth—in the constellation Camelopardalis. During Hubble’s era, astronomers debated whether such formations were ...

Visit us in Washington, DC and Chantilly, VA to explore hundreds of the world’s most significant objects in aviation and space history. Free timed-entry passes are required for the Museum in DC. This ...

Visit us in Washington, DC and Chantilly, VA to explore hundreds of the world’s most significant objects in aviation and space history. Free timed-entry passes are required for the Museum in DC.

Visit us in Washington, DC and Chantilly, VA to explore hundreds of the world’s most significant objects in aviation and space history. Free timed-entry passes are required for the Museum in DC.

Visit us in Washington, DC and Chantilly, VA to explore hundreds of the world’s most significant objects in aviation and space history. Free timed-entry passes are required for the Museum in DC.

Composite showing Col. Stapp during rocket sled test at Holloman AFB, NM. Test to study effects of bailout at high altitude and supersonic speeds. Photos 1-3 taken during acceleration phase: force = ...

Visit us in Washington, DC and Chantilly, VA to explore hundreds of the world’s most significant objects in aviation and space history. Free timed-entry passes are required for the Museum in DC.

Deke Slayton demonstrates the modified LiOH canister to Mission Control during the Apollo 13 mission. (NASA image S70-35013) Using a clever solution of a plastic bag, cardstock, a spacesuit hose, and ...

Dates. TII Teachers accepted in 2025 will be onsite in Washington, DC July 7-18, 2025 and July 13-24, 2026. Who Should Apply. Middle School (grades 5-8) STEAM teachers who have an interest in ...

Pan American Airways Boeing Model 314 Clipper Atlantic Clipper takes off from Manhasset Bay off Port Washington, Long Island, New York.(SI 2000-6164) Other nations opened the world to air travel using ...