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How Do We Measure the Distance to Stars?

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Do Cosmic Rays Spark Lightning? - Instant Egghead

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How Do Earthquake Warning Systems Work?

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Comets versus Asteroids - Instant Egghead

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What Does the Universe Sound Like? - Instant Egghead

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Is Our Universe a Hologram? - Instant Egghead

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Who Owns Outer Space? - Instant Egghead

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Cosmos-Mapping Team wins 2017 Breakthrough Prize in Physics

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Neutron Star Collisions Create Gold

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Cassini Says Goodbye

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See Jupiter's Great Red Spot Up Close

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Top Ten Weirdest Things in the Solar System

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TRAPPIST-1 and a Trove of Exoplanets

2:06

Pioneer 10 Meets Jupiter - It Happened in Space #24

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Moon Meeting of Apollo12 and Surveyor 3 - It Happened In Space #23

3:09

Mutiny on Apollo 7 - It Happened in Space #22

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When NASA Lost a Spacecraft Because It Didn't Use Metric - It Happened in Space #21

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Voyager 2's Grand Tour - It Happened in Space #20

2:19

The Pen that Saved Apollo 11 - It Happened in Space #19

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Behind NASA's First Spacewalk - It Happened in Space #18

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Apollo 10's Non-Landing on the Moon - It Happened In Space #17

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The Top 5 Strangest Things Ever Shot Into Space - The Countdown #47

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5 Ways Space Travel Affects the Human Body - The Countdown #46

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How Can Galaxies Move Faster than Lightspeed? - Ask the Experts #25

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Food (and Bacon) on the Moon - It Happened In Space #16

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5 Things Dark Matter Could Be - The Countdown #45

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Apollo 9's Unused Contingency Plan - It Happened In Space #15

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5 Facts about Gravity Waves from the Big Bang - The Countdown #44

4:37

Why Is There Something Instead of Nothing? - Ask the Experts #24

4:16

5 Space Photos that Speak to Our Human Existence - The Countdown #43

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5 Strange Ways to Clean Up Our Space Junk - The Countdown #42

1:56

Apollo and the Saturn IB Rocket - It Happened In Space #14

3:59

5 Everyday Products Developed from NASA Technology - The Countdown #41

3:29

Will Heat from Our Dying Sun Make Mars Habitable? - Ask the Experts #23

3:36

5 Things You Need to Know About Rosetta, the Comet Chaser -- The Countdown #40

2:13

The Return of Apollo 13's Plutonium - It Happened In Space #13

3:40

5 Remarkable Facts About the Northern Lights (Aurora Borealis) - The Countdown #39

4:27

Top 5 Space Stories of 2013! - The Countdown #38

3:50

5 Signs of Life On Mars - The Countdown #37

2:52

Apollo 8's Lunar Christmas - It Happened in Space #12

3:01

5 Things You Should Know About Comet ISON - The Countdown #36

3:19

Asteroid with Six Tails! - The Countdown #35

3:02

Could We Destroy a Black Hole with Antimatter? - Ask the Experts #22

3:19

Gene Cernan's Challenging Spacewalk - It Happened in Space #11

4:16

The Coldest Place in the Universe - The Countdown #34

3:15

BOR-4, the Soviet Space Shuttle Test Bed - It Happened in Space #10

5:54

5 Amazing Exoplanets! - The Countdown #33

5:37

Is The Universe Flat or Curved? - The Countdown #32

6:34

What if Our Galaxy Contained a Powerful Quasar? - Ask the Experts #21

6:05

Voyager Enters Interstellar Space! - The Countdown #31

2:53

When the Soviets Photographed the Surface of Venus - It Happened in Space #9

5:48

Did Life Come From Mars? - The Countdown #30

4:22

Why is The Moon Moving Away From Us? - Ask The Experts #20

5:22

Star Music! - The Countdown #29

3:41

The Lunokhod Rovers - It Happened in Space #7

6:35

Top 5 Places to Look for Alien Life! - The Countdown #28

6:56

Sean Carroll Answers Your Questions - Ask the Experts #19

6:12

Black Hole Devours Cosmic Cloud! - The Countdown #27

2:50

Luna 15 and Apollo 11 - It Happened in Space

6:12

5 Unsolved Space Mysteries! - The Countdown #26

5:37

Can Matter Exist Without Space? - Ask the Experts #18

5:20

Map of the Local Universe! - The Countdown #25

3:05

The First Woman in Space: Valentina Tereshkova - It Happened in Space #6

6:07

Hypervelocity Stars! - The Countdown #24

4:52

Caleb Scharf Answers Your Questions - Ask the Experts #17

6:37

Galactic Collision! - The Countdown #23

6:17

Ancient Underground Oasis! - The Countdown #22

5:01

What Happens to Black Holes When Galaxies Collide? - Ask the Experts #16

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Gemini's Paraglider Landing System - It Happened in Space #5

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Antarctica's Supernova Sand! - The Countdown #21

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Welcome to Scientific American Space Lab!

6:36

Missing Mars Lander Found! - The Countdown #20

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Yuri Gagarin's Falsified Record - It Happened in Space #4

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How Massive Stars Are Born! - The Countdown #19

7:34

What Does Gravity Do To Light? - Ask the Experts #15

5:42

The Methuselah Star! - The Countdown #18

2:24

Mannequin Cosmonaut Ivan Ivanovich - It Happened In Space #3

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Black Hole Spins Near Light-Speed! - The Countdown #17

8:08

How Do We Determine the Edge of the Universe? - Ask the Experts #14

6:27

Meteor Attack from Space! - The Countdown #16

2:24

Trouble with Glenn's Heat Shield - It Happened in Space #2

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Sailing on Sunlight! - The Countdown #15

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Why Hasn't the Universe Collapsed Into a Giant Black Hole? - Ask the Expert #13

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Saturn's Super-Sized Storm! - The Countdown #14

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First Rovers Designed by Soviets - It Happened in Space #1

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Couch Potatoes on Mars! - The Countdown #13

5:51

Top 5 Space Stories of 2012! - The Countdown #12

5:50

Green Bean Galaxies! -The Countdown #11

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A Super Jupiter!! - The Countdown #10

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The Story of YouTube Space Lab

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The Real Planet Krypton!! - The Countdown #9

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Space Lab LIVE!: Behind the Scenes

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Hurricanes & Supernovas! - The Countdown #8

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Spinning Earth Collision Solves Moon Mystery!! - The Countdown #7

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Caleb Scharf Answers Your Questions! - Ask the Expert #12

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Nazi Buddhist Iron Man from Space!! - The Countdown #6

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Are We Stardust? - Ask The Expert #11

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Magnetic Super Star!! - The Countdown #5

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Jupiter: Badass - _____#9