Gravity

We couldn't live without it, but we're still not really sure we have it all figured out. What do we know about this incredible force, and what mysteries of gravity still remain?

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100 Greatest Discoveries: Physics

In this video clip, physicists study the primal forces of the universe-gravity, electromagnetics and the strong and weak nuclear force. Learn more about the wonderful world of physics in this video from Discovery.


In this video clip, physicists study the primal forces of the universe-gravity, electromagnetics and the strong and weak nuclear force. Learn more about the wonderful world of physics in this video from Discovery.
2:53

100 Greatest Discoveries: Physics

Watch this NASA "Ask an Astronomer" video to see why the moon doesn't smash into the Earth. Since the moon is so far away from Earth and is moving so fast, it's actually always falling. It just never hits the earth and stays in a continuous orbit.
1:50

Ask An Astronomer: Falling Moon

Aristotle believed that heavier objects fall to Earth faster than lighter objects, and it wasn't until Galileo questioned the theory that it was proven wrong. Learn more about gravity on Discovery Channel's "Assignment Discovery."
2:11

Assignment Discovery: Aristotle Galileo and Gravity

Theories suggest that when a neutron star is more than three times as heavy as our sun even the neutrons cannot resist gravity, imploding into a black hole. Learn more on Discovery Channel's "Assignment Discovery."
2:51

Assignment Discovery: Black Hole Formation

On Discovery Channel's "Assignment Discovery," Albert Einstein was a revolutionary thinker, and his theory of general relativity brought a new understanding to the concept of gravity.
2:29

Assignment Discovery: Einstein and General Relativity

The event horizon is not made of matter, and is, in a sense, just a location where gravity becomes so strong nothing can escape. Learn more about event horizon on Discovery Channel's "Assignment Discovery."
2:54

Assignment Discovery: Event Horizon

On Discovery Channel's "Assignment Discovery," learn the role of gravity in the sun's existence. Without gravity the sun would blow itself apart.
1:54

Assignment Discovery: Gravity's Effect on the Sun

On Discovery Channel's "Assignment Discovery," learn about Sir Issac Newton's book, "Principia," which contains his ideas on how mass interacts with force, inertia and acceleration, and his historic definition of gravity.
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Assignment Discovery: Issac Newton's Principia

The more mass an object has the stronger its inward pull. Learn more about this concept and John Mitchell's ideas on Discovery Channel's "Assignment Discovery."
1:58

Assignment Discovery: John Mitchell and Gravity

Multiple forces such as gravity and friction combine to make the net force. Learn more about forces on Discovery Channel's "Assignment Discovery."
0:56

Assignment Discovery: Net Force

Learn about Issac Newton and his theory of gravitational pull on Discovery Channel's "Assignment Discovery."
1:31

Assignment Discovery: Newton and Gravitational Pull

On Discovery Channel's "Assignment Discovery," Issac Newton was the first to understand that gravity was a universal force that influenced all objects.
2:04

Assignment Discovery: Newton's Explanation of Gravity

On Discovery Channel's "Assignment Discovery," learn about Isaac Newton's laws of motion and how they are still upheld in everyday life and in science today.
2:56

Assignment Discovery: Newton's Laws of Motion

The more mass a star or planet has, the more steeply it bends space-time around it. Learn more about space-time on Discovery Channel's "Assignment Discovery."
2:57

Assignment Discovery: Space Time

Weightlessness has a traumatic effect on the human body, resulting in muscle loss. Astronauts, once back on Earth, have to strengthen themselves all over again. Learn more about weightlessness on Discovery Channel's "Assignment Discovery."
2:30

Assignment Discovery: Weightlessness in Space

Most astronomers believe that black holes are at the center of every galaxy. Learn the facts and examine the evidence for yourself in this video.
2:29

Black Holes: The Heart of Every Galaxy

Creating a practical space suit is still a challenge for scientists. On TLC's "Destination Mars," we follow some of the first steps to create a suit specifically for Mars.
2:55

Destination Mars: Mars Space Suit

An award-winning 20-minute documentary on LIGO, the Laser Interferometer Gravitational Wave Observatory. The video examines how LIGO is spearheading the completely new field of gravitational wave astronomy and opening a whole new window on the universe. I
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Einstein's Messengers

What are supernovas and how can they be used to tell how far a star is from Earth? Find out on the Science Channel's "Exploring Time."
2:39

Exploring Time: Studying Supernovas

How can the human body tolerate the crushing G-force that occurs at high acceleration? Learn more about G-forces on Discovery Channel's "Extreme Engineering."
1:23

Extreme Engineering: Acceleration and G Force

Despite the fact that geckos are renowned for their almost unnaturally abrasive feet, these little lizards also possess surprisingly useful tails. It has even been suggested that the tail is the geckos 5th appendage. See why in this video.
0:58

Geckos Multipurpose Tail

The idea behind a gravity assist is to use a planet's motion to accelerate a satellite. Check out our podcast on HowStuffWorks to learn more about the effects of gravity on satellites.
2:20

Gravity and interplanetary satellites

Watch to see just how this liquid can defy gravity.
1:33

Head Rush: Gravity Defying Liquid

Check out this gravitational Head Rush experiment.
1:08

Head Rush: Ping Pong Gravity

Since there is no gravity in space, how can astronauts get the torque needed to turn a bolt or screw? Watch this NASA video to see how astronauts solved this challenge.
1:00

How Can You Turn a Bolt in Space

There could be much more to black holes than we think; Scientists explain that black holes could be portals to other universes, or doors to time travel.
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How the Universe Works: Are Black Holes Wormholes?

In 1929, Hubble discovered that galaxies were flying away from the earth at incredible speed.
2:19

How the Universe Works: Big Bang Breakthrough

Black holes form when supermassive stars collapse, which triggers an extreme gravitational unbalance.
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How the Universe Works: Birth of a Black Hole

A black holes' gravitational pull is an unstoppable force that swallows everything.
2:20

How the Universe Works: Black Hole's Sucking Power

A fun experiment of mixing salt and sugar can cause the items to clump together in gravity-filled space...creating the beginning of a fake planet.
2:02

How the Universe Works: The Power of Dust

NASA astronauts train vigorously at their neutral buoyancy lab in preparation for SM4, a massive final mission to revive the Hubble Space Telescope.
2:02

Hubble's Final Chapter: Training for SM4 Mission

Meet the world's largest boat lift, which allows commuters to travel between the Great Lakes. So, how does it work?
0:56

Machines: Boat Lift

Find out how a special binocular telescope allows viewers to look at the stars.
3:20

Machines: Telescope

Atoms are unpredictable. It's hard to be certain if they exist or not. Space, at an atomic level, has an energy field full of particles that annihilate each other. Learn more about atoms on The Science Channel's "Master of the Universe."
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Master of the Universe: Annihilation of Atoms

Physicist Pedro Ferreira explains the theories of the universe and how stars and planets affect the empty space surrounding it called curve space. Learn more about curve space on The Science Channel's "Master of the Universe."
3:00

Master of the Universe: Curve Space

On The Science Channel's "Master of the Universe," meet world renowned physicist Stephen Hawking.
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Master of the Universe: Egghead in a Wheelchair

Physicist Stephen Hawking is trying to understand what happened during the Big Bang, but gravity doesn't fit in his picture. Learn about his quest to come up with the theory of everything on The Science Channel's "Master of the Universe."
2:56

Master of the Universe: Gravity and the Big Bang

On The Science Channel's "Master of the Universe," learn how physicist Stephen Hawking has tried to explain the relationship of gravity and the other forces that emerged after the Big Bang.
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Master of the Universe: Gravity vs Other Forces

Michael Green and John H. Schwarz's version of the string theory suggests there are 11 dimensions and explained why gravity is so weak now. Learn more about this breakthrough on The Science Channel's "Master of the Universe."
1:29

Master of the Universe: Green and Schwarz String Theory

One of Stephen Hawking's greatest achievments is managing to link the theories of the big and the small. Learn more about Hawking on The Science Channel's "Master of the Universe."
1:48

Master of the Universe: Hawking Linking Theories

On The Science Channel's "Master of the Universe," learn about the research done by Stephen Hawking and Roger Pennrose on the existence of black holes.
2:52

Master of the Universe: Hawking's Theory of Black Holes

Stephen Hawking spent 45 years trying to create the theory of everything. While the M-theory might explain why gravity is so weak, it suggests there are more dimensions than the three we experience. Learn more on "Master of the Universe."
2:57

Master of the Universe: M Theory

After discovering black holes, Stephen Hawking realized he could reverse Penrose's equation and apply it to the entire universe. Learn more on The Science Channel's "Master of the Universe."
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Master of the Universe: Reversing Penrose's Equations

Learn about the theory of singularity and how it became the basis of Stephen Hawking's life's work on The Science Channel's "Master of the Universe."
2:49

Master of the Universe: Singularity

Even though Stephen Hawking is almost completely paralyzed, he puts in full weeks of teaching and lectures. Watch the famous physicist at work on The Science Channel's "Master of the Universe."
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Master of the Universe: Stephen Hawking Lectures

Stephen Hawking has an unusual appetite for life. Though he's almost completely paralyzed, he continues to make scientific advances. He also has one of the most recognized voices in the world. Learn more on The Science Channel's "Master of the Universe."
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Master of the Universe: Stephen Hawking's Famous Voice

Learn about the theories of today's most famous physicist Stephen Hawking on The Science Channel's "Master of the Universe."
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Master of the Universe: Stephen Hawking's Theories

The theory of Super Symmetry solved part of Hawking's problem with gravity, but he wasn't able to determine why it is so weak in comparison to the other forces of the universe. Learn more about gravity on The Science Channel's "Master of the Universe."
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Master of the Universe: Super Symmetry

In the instant of creation there was one single force called super symmetry. But as the universe expanded the force cracked and became unsymmetrical. Learn more about the super symmetry theory on The Science Channel's "Master of the Universe."
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Master of the Universe: Super Symmetry Theory

Gravity might feel weak because it's fighting through many dimensions. Stephen Hawking is optimistic that evidence of this will be found. Learn more on The Science Channel's "Master of the Universe."
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Master of the Universe: Theory of Everything Evidence

On The Science Channel's "Master of the Universe," Stephen Hawking discusses the phenomenon of thermal radiation from black holes and what it means in connection to the beginning of our universe.
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Master of the Universe: Thermal Radiation

The MythBusters test buoyancy and explain the science behind why boats float.
3:12

MythBusters: Let's Talk Buoyancy

Was it painful hitting the water? Why did Jamie bother jumping? What about a MythBusters theme park? Jamie and Adam reflect on the making of Waterslide Wipeout.
3:52

Mythbusters: Waterslide Wipeout Aftershow

Learn about the primal forces of the universe-gravity, electromagnetic, the Strong and Weak nuclear force.
2:53

Physics: Primal Forces

See a dry dock in action. Watch how a giant ship is transported onto blocks to be serviced on Discovery Channel's "Really Big Things."
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Really Big Things: Dry Docks

To create artificial gravity, Michio Kaku employs the principles of centrifugal force.
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Sci Fi Science II: Mimicking Gravity

On Discovery Channel's "Science of the Impossible," learn about the possibility of constructing a moon base where humans can settle.
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Science of the Impossible: Moon Base

Is there actually such a thing as zero gravity? Find out in this video from the Science Channel's "Spaced Out."
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Spaced Out: Zero Gravity

The immense gravity of black holes makes them natural time machines. Someday spacecraft may be able use them to journey into the future.
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Stephen Hawking's Universe: Black Hole Time

The first tests of the Lunar Landing Research Vehicle were carefully gauged so as to best mimic the real gravity conditions that astronauts might face on the moon. Watch the LLRV test flight in this clip from the Discovery Channel's "Strange Planes."
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Strange Planes: LLRV Test Flight

Hackett struggles against rusted metal and gravity to complete his obtanium fueled railway train.
2:07

Stuck With Hackett: Column Of Awkward

Hackett devises a conveyor belt of sponges to power his out door toilet.
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Stuck With Hackett: Success with Sponges

Hackett never tries to toot his own horn, but true geniuses never do.
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Stuck With Hackett: The G Word

Not a man who's want to sit around, Hackett devises a home made facial razor from a beer bottle.
2:17

Stuck With Hackett: The Virtue Of Patients

Isaac Newton actually discovered gravity by studying comets, not apples falling from a tree. Learn the truth behind this fable with The Science Channel's "The Comet's Tale."
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The Comet's Tale: Isaac Newton

After these beams are cut, the only thing keeping this building up is gravity.
1:11

The Imploders: Cutting Beams

Find out what it takes to implode a building, step by step, in this video clip.
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The Imploders: Imploding a Building

The Kelleys are the big family of boom responsible for bringing some of America's largest structures crumbling down.
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The Imploders: Meet the Imploding Family

On Discovery Channel's "The Unfolding Universe," watch footage of an early study done by the US Air Force to test the effects of high altitude on the human body.
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The Unfolding Universe: Air Force Altitude Experiment

On Discovery Channel's "The Unfolding Universe," learn how black holes will one day consume the Milky Way and eventually consume each other.
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The Unfolding Universe: Black Holes Consume the Milky W

On Discovery Channel's "The Unfolding Universe," learn how galaxies are formed.
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The Unfolding Universe: How Galaxies are Formed

On Discovery Channel's "The Unfolding Universe," learn what black holes are and how they work.
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The Unfolding Universe: Introduction to Black Holes

On Discovery Channel's "The Unfolding Universe," learn how gravity is causing a group of stars at the center of the universe to move at 3 million miles per hour. Also, meet one of the first U.S. Air Force test pilots for the space program.
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The Unfolding Universe: The Force of Gravity

On The Science Channel's "The Year in Space 2000," learn how working in space can create a number of problems due to the zero gravity atmosphere. NASA has devised special equipment to enable the astronauts to work efficiently and safely in space.
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The Year in Space 2000: Working in Space

One theory suggests that the world may be made of something called Weakly Interacting Massive Particles or WIMPs, and the answer to this theory can be found underground.
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Through the Wormhole: Dark Matter

If we could distinguish the role gravity plays in the quantum realm, it could answer the question of whether or not it's possible to travel through time.
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Through The Wormhole: Gravity Domination

Scientists are on a lengthy hunt for WIMPs (Weakly Interacting Massive Particles). After a year of searching underground, has the answer to the world's creation been uncovered?
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Through the Wormhole: Is That a WIMP?

The laws of gravity, momentum and viscosity are on this bartender's side. Check out this clip from Discovery's "Time Warp" series to learn more.
0:38

Time Warp: High Ball-Shooter MultiMix

"Time Warp" host Jeff Lieberman puts Newton's law of gravity to the test with a spiked helmet and apples.
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Time Warp: Newton's Apple

On TLC's "Ultra Science," learn how weightlessness impacts the human body in space.
2:48

Ultra Science: Weightlessness

Worried that the highly educated opposing team will out-engineer them, a divided Team Blecha Brothers debates the mechanics of their anti-gravity room.
1:32

Unchained Reaction: Bleep Worthy Plan

How do you make balloons able to lift up a safe? Not easily, as Team Blecha Brothers -- consisting primarily of Hollywood set carpenters -- discovers.
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Unchained Reaction: Falling Up

Watch this NASA video showing how astronauts simulate weightlessness by practicing training maneuvers underwater. Learn how density plays a role in helping astronauts train for missions in space like space walking.
1:00

Why do Astronauts Practice Underwater?

Everyone know the Earth spins, but why? And did you know it's slowing down? Learn more in this video.
2:03

Why Tell Me Why: Our Spinning Earth

The reduced gravity of space offers challenges and diversion for astronauts. Check out this video from the archives of Discovery to see astronauts in zero-gravity action.
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Zero Gravity Activity

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