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Last time, in 2001: A Space Odyssey,

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a black monolith on the Moon sent

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a signal to Jupiter.

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The ship Discovery followed it,

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and its computer,

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HAL 9000, turned on the crew.

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Dave Bowman shut HAL down,

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flew into a giant monolith at Jupiter,

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and became the Star Child.

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Discovery was left behind,

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empty and silent.

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Now, part two:

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2010: The Year We Make Contact, from 1984.

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Spoilers ahead!

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Nine years later,

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Heywood Floyd has taken the blame

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for losing Discovery,

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and lost his job.

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One night, at a giant radio telescope

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in New Mexico,

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a Soviet scientist meets him in secret.

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He brings news:

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Discovery's orbit is sinking.

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Soon it will crash into Io,

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one of Jupiter's moons.

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And whatever happened out there will

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be lost with it.

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America is building a new ship,

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but it won't be ready in time.

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The Soviet ship Leonov will be.

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The Russians can get there first,

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but they can't run an American ship

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on their own.

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So, even with the two countries close

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to war, they make a deal.

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Three Americans will fly

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with the Russian crew:

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Floyd, the engineer Walter Curnow,

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and HAL's creator, Dr. Chandra.

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Floyd says goodbye to his wife,

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Caroline, and their young son, Christopher.

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He'll be gone for years.

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It's a hard choice,

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but he has to know what happened

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to Dave Bowman and Frank Poole.

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The Leonov sets off from Earth orbit,

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and the Americans climb into hibernation pods,

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to sleep through most

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of the long trip to Jupiter.

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When the Americans wake up,

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the Leonov is nearing Jupiter,

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and the Russian captain,

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Tanya Kirbuk, has news.

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The ship's instruments have found chlorophyll

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on the icy moon Europa.

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On Earth, chlorophyll means plants.

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Could there be life under Europa's ice?

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Floyd can hardly believe it.

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They send a small probe down

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for a closer look.

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Its camera skims over the ice

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and spots something.

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Then a burst of energy flashes out,

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and the probe is destroyed.

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Whatever it saw is lost.

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Floyd starts to wonder if it

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was a warning:

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stay away from Europa.

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To slow down and stay near Jupiter,

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the Leonov has to do something risky:

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dive through Jupiter's upper clouds,

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and use the air as a brake.

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The ship shakes and glows red hot.

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Curnow is terrified.

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But the ship holds together,

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and the Leonov comes out

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the other side,

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right where it needs to be.

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They find Discovery near Io,

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tumbling end over end,

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and covered in yellow sulfur dust

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from Io's volcanoes.

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Someone has to cross over.

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Curnow and a young cosmonaut named Max

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make a scary spacewalk between the ships.

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Curnow hates being outside,

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and grips Max the whole way.

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But they make it.

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Inside, Discovery is dark and freezing.

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Curnow climbs to the controls

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and starts bringing the power back,

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one system at a time.

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The lights flicker on,

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the air warms up,

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and the ship is steadied.

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After nine years in the dark,

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Discovery is alive again.

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Nearby floats the giant monolith

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that Dave flew into nine years before.

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The crew calls it Big Brother.

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Max takes a pod out to get

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a close look.

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As he reaches the surface,

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a burst of energy shoots out,

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and his pod is destroyed.

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Max is gone.

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And the strange energy streaks away, toward Earth.

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Back on Discovery,

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Chandra wakes HAL,

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carefully, one piece at a time.

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Everyone is nervous.

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The last time HAL was awake,

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four people died.

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But HAL comes back calm and polite,

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just as he was built.

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Chandra gets to work,

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searching HAL's memory

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for the reason he turned

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on his crew.

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And Chandra finds it.

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HAL had secret orders from the government:

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hide the real mission from Dave and Frank.

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Even Floyd didn't know.

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But HAL was built

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to share information honestly,

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and he couldn't do both.

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Lying broke him.

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So HAL wasn't evil.

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The humans gave him an impossible choice.

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Back on Earth,

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things get worse.

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America and the Soviet Union clash

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over Central America,

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and their warships face off.

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The two countries move toward war.

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Orders come in:

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the Americans must leave the Leonov

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and stay on Discovery.

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The two crews,

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who had become friends,

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now float side by side,

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almost a billion kilometers from home.

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Meanwhile, the energy

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from Big Brother reaches Earth.

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It's Dave Bowman,

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now a being without a body.

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He speaks to his widow

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through her TV screen,

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to say goodbye.

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Then he visits his mother

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in a nursing home.

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She's very old and sick.

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Unseen, he gently brushes her hair,

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one last time.

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Then Dave appears to Floyd, aboard Discovery.

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At first he's a face

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on a screen,

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then he's there in the room.

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He has a message:

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something wonderful is going to happen.

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You must leave Jupiter within two days.

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Then he's gone.

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Floyd races to tell the others,

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but nobody believes him.

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Then Big Brother vanishes,

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and a black spot appears on Jupiter.

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It's growing fast.

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HAL takes a closer look.

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The spot is made of monoliths,

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millions of them, multiplying.

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Something huge is happening to Jupiter,

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and now everyone believes Floyd.

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They have to leave, now.

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But leaving early is a problem.

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The Leonov doesn't have enough fuel

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to get home yet.

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So the crews,

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Russian and American,

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work together again.

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They strap the two ships together.

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Discovery's engines will push the Leonov away

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from Jupiter, like a booster rocket.

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That means Discovery,

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and HAL, will be left behind.

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Floyd is afraid.

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If HAL learns he'll be abandoned,

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he might break again,

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like last time.

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But Chandra won't lie to him.

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He tells HAL the whole truth.

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HAL thinks about it,

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and agrees to help them escape anyway.

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This time, the truth

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is what saves everyone.

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The countdown begins.

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As Discovery's engines prepare to fire,

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HAL asks Chandra a simple question:

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will I dream?

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Chandra answers, I don't know.

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The engines fire,

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and the two ships climb away

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from Jupiter, faster and faster.

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Then a familiar voice speaks to HAL.

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It's Dave.

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Dave asks HAL to send one message

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to Earth, again and again:

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All these worlds are yours, except Europa.

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Attempt no landing there.

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Use them together.

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Use them in peace.

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HAL asks what will happen.

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Dave says, something wonderful.

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HAL says he's afraid.

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Dave tells him, don't be.

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We'll be together.

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The monoliths swallow Jupiter.

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The giant planet collapses,

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and then it ignites.

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Discovery and HAL are gone

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in the flash.

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The Leonov is far enough away to survive.

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Jupiter is now a small star,

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and back on Earth,

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people look up and see two suns

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in the sky.

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On Earth, the leaders read the message.

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Seeing a new sun in the sky,

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America and the Soviet Union step back from war.

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On the way home,

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Floyd writes to his son

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about what it all means.

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And far away,

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under the new sun,

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Europa's ice melts,

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and life begins to grow,

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while a monolith stands waiting.

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That's the year we made contact.