bing chen and yan li

Today we're teaming up with Joe Scott to look at the Great Attractor, a mysterious and massive source of gravity obscured from our vision, and the concept of Dark Flow, movements of whole clusters of galaxies in directions with no obvious cause.

Companion Episode at Answers with Joe:
https://www.youtube.com/watch?v=Dg1Q9...

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Cover Art by Jakub Grygier: https://www.artstation.com/artist/jak...

In memory of Carl Sagan, this episode will review many of the topics he covered during his career and see what what we've learned about the Cosmos and its inhabitants since then.

Visit our Website: http://www.isaacarthur.net
Join the Facebook Group: https://www.facebook.com/groups/15839...
Support the Channel on Patreon: https://www.patreon.com/IsaacArthur
Visit the sub-reddit: https://www.reddit.com/r/IsaacArthur/
Listen or Download the audio of this episode from Soundcloud: https://soundcloud.com/isaac-arthur-1...
Cover Art by Jakub Grygier: https://www.artstation.com/artist/jak...


Graphics Team:
Edward Nardella
Jarred Eagley
Justin Dixon
Katie Byrne
Kris Holland
Misho Yordanov
Murat Mamkegh
Pierre Demet
Sergio Botero
Stefan Blandin

Script Editing:
Andy Popescu
Connor Hogan
Edward Nardella
Eustratius Graham
Gregory Leal
Jefferson Eagley
Luca de Rosa
Mark Warburton
Michael Gusevsky
Mitch Armstrong
MolbOrg
Naomi Kern
Philip Baldock
Sigmund Kopperud
Steve Cardon
Tiffany Penner

Music
Vangelis, "Heaven & Hell, part 1, No3
Aerium, "Fifth Star of Aldebaran"
Kai Engel, "Endless Story About Sun and Moon"
AJ Prasad, "Aether"
Dan McLeod, "Mysterious Universe"
Lombus, "Cosmic Soup"

A look at Dark Matter, what it is, what it isn't, and what it might be used for.

Visit our Website:
www.IsaacArthur.net

Support the Channel on Patreon:
https://www.patreon.com/IsaacArthur

Listen or Download the audio of this episode from Soundcloud:
https://soundcloud.com/isaac-arthur-1...

Cover Art by Jakub Grygier:
https://www.artstation.com/artist/jak...

Dark Matter as Primordial Black Holes discusses:
http://www.space.com/33122-dark-matte...

To see deeper into space, we will need much bigger telescopes.
Visit our sponsor, Brilliant: https://brilliant.org/IsaacArthur/
As astronomy seeks to find and study distant planets and peer further and more accurately into space and time, the limitations of ground based telescopes, especially optical telescopes, represents our largest barrier. Today we will examine what those limitations are, and ways to make vastly more enormous telescopes and arrays.

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Listen or Download the audio of this episode from Soundcloud: Episode's Audio-only version:
https://soundcloud.com/isaac-arthur-1...
Episode's Narration-only version: https://soundcloud.com/isaac-arthur-1...

Credits:
Megatelescopes
Season 4, Episode 19

Writers:
Isaac Arthur
Mark Warburton

Editors:
Darius Said
Jerry Guern
Keith Blockus
Producer:
Isaac Arthur

Cover Artist:
Jakub Grygier https://www.artstation.com/artist/jak...

Graphics Team:
Jarred Eagley
Jeremy Jozwik
Justin Dixon
Katie Byrne
Luca DeRosa
Mihail Yordanov
Sam McNamara (Rapid Thrash)
Sergio Botero https://www.artstation.com/sboterod?f...

Narrator:
Isaac Arthur

Music Manager:
Luca De Rosa lucaderosa2@live.com

Music:
Stellardrone, "Billions And Billions" https://stellardrone.bandcamp.com
Aerium, “Waters of Atlantis" https://www.youtube.com/channel/UCRnU...
Lombus, “Time Slip" https://soundcloud.com/lombusmusic
Markus Junnikkala, "A Memory Of Earth" https://www.markusjunnikkala.com/
Stellardrone, "Light Years" https://stellardrone.bandcamp.com

We take a moment talk about the accomplishments of Stephen Hawking, perhaps the best known scientist of the late 20th century, and a major influence on many of SFIA's concepts.

There's also a very nice tribute to him by our friends over at PBS Space Time: https://www.youtube.com/watch?v=qPKj0...