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five four three two one liftoff and the

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five four three two one liftoff and the
 

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five four three two one liftoff and the
Titan 4 with its more spacecraft display

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Titan 4 with its more spacecraft display
 

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Titan 4 with its more spacecraft display
the top

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in the late 1990s NASA is planning to

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in the late 1990s NASA is planning to
 

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in the late 1990s NASA is planning to
conduct an unmanned mission to Mars its

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conduct an unmanned mission to Mars its
 

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conduct an unmanned mission to Mars its
purpose is to collect soil samples for

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purpose is to collect soil samples for
 

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purpose is to collect soil samples for
return to earth and to perform other

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return to earth and to perform other
 

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return to earth and to perform other
scientific experiments this video

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scientific experiments this video
 

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scientific experiments this video
depicts one possible scenario for the

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depicts one possible scenario for the
 

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depicts one possible scenario for the
three-year mission two payloads are

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three-year mission two payloads are
 

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three-year mission two payloads are
launched aboard to Titan for rockets

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launched aboard to Titan for rockets
 

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launched aboard to Titan for rockets
upon arrival at Mars an arrow capture

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upon arrival at Mars an arrow capture
 

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upon arrival at Mars an arrow capture
maneuver is used to place each payload

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maneuver is used to place each payload
 

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maneuver is used to place each payload
into an elliptical orbit one payload

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into an elliptical orbit one payload
 

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into an elliptical orbit one payload
contains a Mars rover and a Mars orbiter

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contains a Mars rover and a Mars orbiter
 

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contains a Mars rover and a Mars orbiter
with an earth return vehicle the other

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with an earth return vehicle the other
 

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with an earth return vehicle the other
payload contains a Mars ascent vehicle

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payload contains a Mars ascent vehicle
 

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payload contains a Mars ascent vehicle
and an imaging and communications

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and an imaging and communications
 

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and an imaging and communications
orbiter

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orbiter
 

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orbiter
shortly after a circularization burn the

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shortly after a circularization burn the
 

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shortly after a circularization burn the
asset vehicle separates from the imaging

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asset vehicle separates from the imaging
 

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asset vehicle separates from the imaging
and communications orbiter performs an

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and communications orbiter performs an
 

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and communications orbiter performs an
entry maneuver and descends to the

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entry maneuver and descends to the
 

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entry maneuver and descends to the
Martian surface

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Martian surface
 

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Martian surface
similar to the SM vehicle the Mars rover

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similar to the SM vehicle the Mars rover
 

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similar to the SM vehicle the Mars rover
lands equipped with artificial

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lands equipped with artificial
 

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lands equipped with artificial
intelligence and a stereo video camera

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intelligence and a stereo video camera
 

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intelligence and a stereo video camera
it spends a year exploring the Martian

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it spends a year exploring the Martian
 

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it spends a year exploring the Martian
surface during this time it transmits

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surface during this time it transmits
 

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surface during this time it transmits
digital video images back to earth and

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digital video images back to earth and
 

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digital video images back to earth and
collect soil samples

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when sampling operations are complete

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when sampling operations are complete
 

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when sampling operations are complete
the rover is instructed to rendezvous

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the rover is instructed to rendezvous
 

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the rover is instructed to rendezvous
with the a sent vehicle once there the

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with the a sent vehicle once there the
 

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with the a sent vehicle once there the
sample canister is transferred the

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sample canister is transferred the
 

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sample canister is transferred the
ascent vehicle then rotates to the

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ascent vehicle then rotates to the
 

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ascent vehicle then rotates to the
vertical launch position and the rover

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vertical launch position and the rover
 

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vertical launch position and the rover
departs to conduct further scientific

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departs to conduct further scientific
 

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departs to conduct further scientific
studies ignition occurs and the boost

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studies ignition occurs and the boost
 

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studies ignition occurs and the boost
module separates from its launch

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module separates from its launch
 

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module separates from its launch
platform

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after an attitude maneuver the vehicle

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after an attitude maneuver the vehicle
 

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after an attitude maneuver the vehicle
is placed in the same orbit as the Mars

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is placed in the same orbit as the Mars
 

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is placed in the same orbit as the Mars
orbiter a radar scan is performed to

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orbiter a radar scan is performed to
 

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orbiter a radar scan is performed to
locate the SN vehicle

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upon acquisition of signals the orbiter

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upon acquisition of signals the orbiter
 

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upon acquisition of signals the orbiter
performs a series of maneuvers to

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performs a series of maneuvers to
 

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performs a series of maneuvers to
rendezvous and dock a docking complete

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rendezvous and dock a docking complete
 

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rendezvous and dock a docking complete
signal initiates transfer of the sample

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signal initiates transfer of the sample
 

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signal initiates transfer of the sample
canister to the earth return vehicle

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the ascent vehicle then undocks to allow

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the ascent vehicle then undocks to allow
 

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the ascent vehicle then undocks to allow
separation of the earth return vehicle

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separation of the earth return vehicle
 

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separation of the earth return vehicle
from the orbiter

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the return vehicle performs an injection

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the return vehicle performs an injection
 

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the return vehicle performs an injection
maneuver to initiate trans earth cruise

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when thrust terminates the engines are

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when thrust terminates the engines are
 

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when thrust terminates the engines are
jettisoned and solar arrays are deployed

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jettisoned and solar arrays are deployed
 

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jettisoned and solar arrays are deployed
for the one-year trip back to earth

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upon arrival at Earth the return vehicle

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upon arrival at Earth the return vehicle
 

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upon arrival at Earth the return vehicle
deploys the earth aerocapture capsule

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deploys the earth aerocapture capsule
 

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deploys the earth aerocapture capsule
during aerocapture friction from the

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during aerocapture friction from the
 

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during aerocapture friction from the
Earth's atmosphere slows the capsule

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Earth's atmosphere slows the capsule
 

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Earth's atmosphere slows the capsule
after aerocapture

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after aerocapture
 

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after aerocapture
the aeroshell is detached and a burn is

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the aeroshell is detached and a burn is
 

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the aeroshell is detached and a burn is
performed to place the vehicle in the

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performed to place the vehicle in the
 

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performed to place the vehicle in the
space stations orbit

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the return vehicle is retrieved by a

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the return vehicle is retrieved by a
 

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the return vehicle is retrieved by a
space station based orbital maneuvering

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space station based orbital maneuvering
 

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space station based orbital maneuvering
vehicle the sample canister is

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vehicle the sample canister is
 

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vehicle the sample canister is
quarantined at the station until it is

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quarantined at the station until it is
 

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quarantined at the station until it is
retrieved by a space shuttle for return

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retrieved by a space shuttle for return
 

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retrieved by a space shuttle for return
to Earth