Public domain
Microgravity
From the collection of NASA Image and Video Library. Free to download, adapt and use — no permission needed.
About this work
STEP will carry concentric test masses to Earth orbit to test a fundamental assumption underlying Einstein's theory of general relativity: that gravitational mass is equivalent to inertial mass. STEP is a 21st-century version of the test that Galileo is said to have performed by dropping a carnon ball and a musket ball simultaneously from the top of the Leaning Tower of Pisa to compare their accelerations.
NASA Image and Video Library’s own descriptionCredit lineMicrogravity. NASA/MSFC, 2004-04-15. Public domain. ID: 0000566.
