This tiny probe the size of your cell phone could measure the gravity of asteroids in 1st space

The European Space Agency (ESA) wants to land a tiny satellite the size of a mobile phone on an asteroid to measure its gravity.

ESA has completed vacuum and vibration tests for its Gravimeter for Small Solar System Objects (GRASS) asteroid probe. GRASS is designed to measure surface gravity on the asteroid Dimorphos, which is from NASA DART spacecraft collided as part of its mission last year. Dimorphos is about 525 feet (160 meters) in diameter, which is roughly the size of NASA’s Vehicle Assembly Building (VAB) at the Kennedy Space Center in Florida. As buildings go, the VAB is huge. It is one of the largest in the world, by area. As planetary bodies go, Dimorphos isn’t that big. In fact, it is the smallest body in the solar system ever visited by a human spacecraft.

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