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T minus ten, nine, eight, seven

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six, five,four, three, two, one

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And liftoff!

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Music

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When NASA's new launch system,

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SLS, has its first flight,

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known as Exploration Mission One

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it will carry the unmanned Orion

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spacecraft on a voyage to the

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moon and back.  It will also be

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carrying multiple small

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spacecraft as secondary payloads

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SLS is the largest and most

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powerful American rocket since

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the Saturn V and will eventually

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send humans farther into space

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than ever before.Two minutes

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into the flight the twin solid

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rocket boosters will burn out.

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About 10 minutes after the Orion

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and it service module escape the

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pull of Earths gravity, the two

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will disconnect and Orion will

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proceed toward the moon. On the

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SLS second stage, housed within

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the multi stage adapter, are

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multiple small spacecraft known

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as cubesats. Cubesats are about

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the size of a large shoebox and

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weigh less than 30 pounds each.

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SLS is carrying these cubesats

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piggyback, which will give them

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a low cost ride into deep space.

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Once Orion is a safe distance

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away, the small payloads will

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begin to be deployed. The

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dispensers on the adapter ring

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completely isolate the cubesats

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from the SLS, they require no

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power and operate completely

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independently of the rocket.

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One of these cubesats is called

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Near Earth Asteroid Scout, or

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NEA Scout, and it will

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demonstrate a new capability

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for exploration, low-cost

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reconnaissance of asteroids.

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Asteroids to which we may one

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day send human explorers.Shortly

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after the NEA scout cubesat is

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ejected from the SLS, solar

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panels will deploy to provide

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the spacecraft with power. Next

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will be unfurled an 85 square

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meter solar sail. The sail, the

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length of a school bus, reflects

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sunlight and is the spacecraft’s

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propulsion system. This is the

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largest solar sail ever

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deployed by the United States.

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NEA scout will fly by moon which

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will help send it on its way to

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the target asteroid. The key

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to enabling this low-cost

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reconnaissance capability, is

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the propulsion system that will

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enable the NEA Scout to go

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from near earth space to a

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deep space rendezvous with

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an asteroid. Using the

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sunlight pressure NEA Scout

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will continuously alter its

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trajectory as it moves toward

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its asteroid rendezvous.

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Sunlight particles or photons,

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which in this case behave

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like tiny ping-pong balls as

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they bounce off of the sail,

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push on the sail as they

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reflect from it. And since the

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sun is always shining, the

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thrust is continuous. However

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it is very small, on the order

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of an ounce of force per

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football field of area. Once

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at the asteroid, NEA Scout's

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onboard camera will image its

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surface in detail, answering

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many questions about the

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asteroid’s composition and

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history. Exploration Mission One

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will serve as a proving

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ground for the integrated Orion

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spacecraft and the Space Launch

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System. In addition, it will

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provide an enabling capability

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for flying interplanetary small