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“Here’s some of the stories trending This
Week at NASA!”

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For the first time, NASA scientists have detected

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light tied to a gravitational-wave event.

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The gravitational wave – caused by an explosive
merger of two neutron stars, about 130 million

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light-years from Earth – produced a gamma-ray
burst and a rarely seen flare-up called a

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"kilonova".

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The phenomenon was captured by our Fermi,
Swift, Hubble, Chandra and Spitzer missions,

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along with dozens of NASA-funded ground-based
observatories.

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On Oct. 20, NASA’s Randy Bresnik and Joe

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Acaba completed the last of three U.S. spacewalks
outside the International Space Station.

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The spacewalkers replaced a failed camera
light on the Canadarm2 robotic arm’s new

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Latching End Effector, installed a new high
definition camera on the station’s truss,

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and completed a variety of other work.

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It was the fifth career spacewalk for Bresnik
and the third for Acaba.

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New images of Saturn are among fresh findings

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from the Cassini spacecraft’s final months
orbiting between the planet and its rings.

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They include a mosaic showing the rings emerging
from behind the planet's limb, while also

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casting shadows on the planet itself.

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Another mosaic shows a panoramic view outward
across the ringscape.

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Researchers also shared a new movie of Saturn's
auroras in ultraviolet light – the final

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such view from the spacecraft's Ultraviolet
Imaging Spectrometer.

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Cassini ended its mission on Sept. 15 with
an intentional plunge into Saturn’s atmosphere,

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but analysis continues of the massive volume
of data the spacecraft sent during its long

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life.

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On Oct. 19, engineers at NASA’s Stennis

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Space Center in Mississippi completed a hot-fire
test of an RS-25 flight engine that will help

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power the agency’s new Space Launch System
(SLS) rocket on Exploration Mission-2 (EM-2)

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– the first flight of the new rocket to
carry humans.

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Meanwhile, the four RS-25 engines that will
power SLS on Exploration Mission-1 (EM-1)

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are ready to be attached to the rocket’s
core stage for further testing.

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Exploration Mission-1 is the first integrated
flight of the SLS with our Orion spacecraft

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-- but without a crew.

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And that’s what’s up this week @NASA …