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Closing in on a hot fire test for Artemis I ...

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A tiny hitchhiker headed for a near-Earth destination ...

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And a final rehearsal for OSIRIS-REx...

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a few of the stories to tell you about –This Week at NASA!

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The Space Launch System (SLS) rocket core stage for the

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Artemis I lunar mission has completed the first four Green Run tests.

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Green Run is a demanding series of eight tests to verify the stage is ready for launch.

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It’ll culminate with a full-up hot fire test of all four of the rocket’s

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RS-25 engines for up to eight minutes.

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Several CubeSats that will hitch a ride on the Artemis I mission

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will eventually be deployed in space.

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One of them, NEA Scout, has a huge solar sail.

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It will travel to and study an asteroid to better understand near-Earth asteroids

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in preparation for a possible future human mission to one of these objects.

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Artemis I is the first integrated,

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uncrewed flight test of our Space Launch System rocket and Orion spacecraft.

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Learn more at nasa.gov/artemis.

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NASA's OSIRIS-REx spacecraft conducted another practice run for its

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upcoming attempt to collect a sample from asteroid Bennu.

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The spacecraft got even closer to Bennu this time than in a previous rehearsal,

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and flew in tandem with the asteroid’s rotation for the first time.

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The first sample collection attempt is Oct. 20.

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If successful, OSIRIS-REx will return the sample to Earth in September 2023.

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For the first time, an experiment to bounce a laser beam from Earth

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off a reflector the size of a paperback novel mounted on our

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Lunar Reconnaissance Orbiter (LRO), received a signal back

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This could enhance laser experiments used to study the physics of the universe.

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Since Apollo, reflectors on

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the lunar surface have helped us learn more about our Moon.