Want to ask some sort of crazy question about Space?:
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
Support us on Patreon! http://www.patreon.com/pbsspacetime

Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll

Hey Everyone! Today, Gabe answers some of your questions and comments from last week’s video, “Can You Trust Your Eyes In Space”! Also, Gabe has a really important announcement on the future of Space Time! Check it out!

“Can You Trust Your Eyes In Space”:
https://www.youtube.com/watch?v=P4rW_pPbD-U

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Comments:

Piffrock
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z13gwlra1tevcpssy22ugthglk3egh1ln

TheN GroupTwo
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z123xz2qnqn4zduon04cg1cj5zmuhvyxlwo0k

DarkMatter2142
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z120dbjylzbszfkl223rub1zllmejzrfh

Christopher Genschow
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z13kep5wcxuefl0hn04cc5pxitmxvzqrxlk0k

spartan300zx
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z125wdibomuvdzomd225ida5vpudxbd0q

fejimanz
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z125szj4gtyqt3gpr04cexgqkkfmglax2xs0k

John Buluba
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z13sd52zmqrdv3fxp04cdx1ziw2ovrajaqs0k

Charles Belton
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z13mxdlpmsj3t5eyc04cgvnwssquifxgxwk0k

Tommy Taffy
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z13xzlrx2svdg5juq22lzdiwnxyyfzluq

Dan Fox
https://www.youtube.com/watch?v=P4rW_pPbD-U&lc=z13njpubmnumxpiju04cfvpbcrvvj51itow0k

—————————————————————–

New SpaceTime episodes every Wednesday!

Hosted by Gabe Perez-Giz
Made by Kornhaber Brown (www.kornhaberbrown.com)

What can you trust in Spacetime?
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
Support us on Patreon! http://www.patreon.com/pbsspacetime

Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g

Last time we talked about what curvature means, looked at geodesics, great circles on spheres, and tried to understand the notion of “straightness”. This week on Spacetime, we take a detour into how geometry works in spacetime. Get excited, because this episode is even more mind-bending than the last!

Past Episodes On SpaceTime:
“Are Space And Time An Illusion?”:
https://www.youtube.com/watch?v=YycAzdtUIko

“Is Gravity An Illusion?”
https://www.youtube.com/watch?v=NblR01hHK6U

“Can A Circle Be A Straight Line?”
https://www.youtube.com/watch?v=D3GVVkPb3OI

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll

Extra Credit:
Overview of Special Relativity and spacetime:
http://www.youtube.com/watch?v=ScdLqAA_64E
http://www.youtube.com/watch?v=aeCsS6PjhK8
http://www.youtube.com/watch?v=NAXHHBUY9_E

http://www.pitt.edu/~jdnorton/teaching/HPS_0410/chapters/spacetime/
http://en.wikibooks.org/wiki/Special_Relativity/Spacetime

Brian Greene’s introduction to special relativity (thanks to viewer Mark G for pointing out these courses!)
http://www.worldscienceu.com/courses/university/space-time-and-einstein (no math)
http://www.worldscienceu.com/courses/university/special-relativity (more math)

Disagreement about event sequence (relativity of simultaneity):
http://en.wikibooks.org/wiki/Special_Relativity/Simultaneity,_time_dilation_and_length_contraction#More_about_the_relativity_of_simultaneity

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Music:
u dont know im fadin
Secret Society – Logical Disorder (http://logicaldisorder.bandcamp.com/)
Movement 3 – Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto)
Philly D Jr – Patternbased (https://soundcloud.com/patternbased)
Earth Breath – Human Terminal (http://freemusicarchive.org/music/Hum…)
Deep Blue – Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto)
Saw Slicing – Patternbased (https://soundcloud.com/patternbased)
Heisse Luft – Thompson and Kuhl (https://soundcloud.com/phlow/05-x-com)
miracle – slow (http://www.restingbell.net/releases/r)
Tropico de Tauro – Sr. Aye https://soundcloud.com/sr-aye)

New SpaceTime episodes every Wednesday!

Hosted by Gabe Perez-Giz
Made by Kornhaber Brown (www.kornhaberbrown.com)

How far would a basketball with backspin go?
Rotor wing experimental aircraft: https://youtu.be/Ra8y6gGotwY
E-ship 1: https://youtu.be/qJ7haGqXs_E
Corner kick by Kyle: https://youtu.be/YIPO3W081Hw

How Ridiculous World Record Basket: https://youtu.be/H9SF2YIKRY8

Want to ask some sort of crazy question about Space?:
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
Support us on Patreon! http://www.patreon.com/pbsspacetime

Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll

Every once in a while we add a second onto our days. Similar to the Leap Year, this is known as the Leap Second. But, if the Leap Year already helps us account for the offset from a calendar in days, what exactly does the Leap Second do? Check out this video for the answer!

New SpaceTime episodes every Wednesday!

Hosted by Gabe Perez-Giz
Made by Kornhaber Brown (www.kornhaberbrown.com)

Want to ask some sort of crazy question about Space?:
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
Support us on Patreon! http://www.patreon.com/pbsspacetime

Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll

Hey Everyone! We saw a lot of comments on last week’s episode about straight lines, curvature, and tangency, so we wanted to take a small break before we continue this series to clarify some points we made in the episode that may have caused confusion. We’ll return with a regularly scheduled episode next week!Hey Everyone! We saw a lot of comments on last week’s episode about straight lines, curvature, and tangency, so we wanted to take a small break before we continue this series to clarify some points we made in the episode that may have caused confusion. We’ll return with a regularly scheduled episode next week!

Comments:

David Shi:
https://www.youtube.com/watch?v=D3GVVkPb3OI&lc=z13kdzgrlwviszmyx04cjjlgyojxgjqhleg

SamBskate:
https://www.youtube.com/watch?v=D3GVVkPb3OI&lc=z124f5d42qyzyjuud23axtsjtyihjhp4h04

Neopick Windfire:
https://www.youtube.com/watch?v=D3GVVkPb3OI&lc=z12ohdurhqa5dxmk423hwhsy4zjnx1avw

aamod Joshi
https://www.youtube.com/watch?v=D3GVVkPb3OI&lc=z12ohdurhqa5dxmk423hwhsy4zjnx1avw

Music:
Heisse Luft – Thompson and Kuhl (https://soundcloud.com/phlow/05-x-com)
Tropico de Tauro – Sr. Aye https://soundcloud.com/sr-aye)

New SpaceTime episodes every Wednesday!

Hosted by Gabe Perez-Giz
Made by Kornhaber Brown (www.kornhaberbrown.com)

Want to ask some sort of crazy question about Space?:
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
Support us on Patreon! http://www.patreon.com/pbsspacetime

Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll

General Relativity! Spacetime! And… Curved Lines? On this week’s episode of Spacetime, Gabe talks about what it actually means for a line to be straight so we can better understand what we mean by the idea of “curved Spacetime”. This is Part One of our series on General relativity, so be sure to check it out!

Links to Annotated Previous PBS Space Time Episodes:
“Is Gravity an Illusion?” https://www.youtube.com/watch?v=NblR01hHK6U
“Are Space and Time an Illusion?” https://www.youtube.com/watch?v=YycAzdtUIko

Extra Credit:
Visualizing parallel transport and geodesics on a sphere:
http://www.applet-magic.com/paralleltransport.htm
http://www.smith.edu/physics/felder/curvedland/tutlines.html

More mathematical PDF about parallel transport and curvature:
http://www.physics.ucc.ie/apeer/PY4112/Curvature.pdf

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Comments:

Jordan Filipovski
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z125y1czyym1i12q204ccvn4fzvqhjg5uus0k

MaybeFactor
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z13wyrlqivrwu34is04civgpczbztvcqg40

scharfy
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z13wtrl4xojqhx4pw04cfnig3tantf4hjdc

ourpensareourlips
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z125it5y0mnetfcmo22ssvxamvelud4i004

JakeFace0
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z12dhvjqmtqltxidj22zjlq5fsumsbib304

QuannanHade
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z12iildz2pacjfms122lspjglnudh1idf

Ali Muzaffar
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z13ccvo5kw3cftgkf23htf45bxqiwxvph04

Marko Nara
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z133zfmhzyzezbxm523ayp2pxq35fbjbj04

Indigo
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z13pcbqphnvvtnspe04cdp4hstflxnwh5as

Jose Catlett
https://www.youtube.com/watch?v=bT3hBK6kAJQ&lc=z13wgfewdtmutxmrf04cj1aqhtzsft4h31g

Music:
u dont know im fadin
Secret Society – Logical Disorder (http://logicaldisorder.bandcamp.com/)
Movement 3 – Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto)
Philly D Jr – Patternbased (https://soundcloud.com/patternbased)
Earth Breath – Human Terminal (http://freemusicarchive.org/music/Hum…)
Deep Blue – Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto)
Saw Slicing – Patternbased (https://soundcloud.com/patternbased)
Heisse Luft – Thompson and Kuhl (https://soundcloud.com/phlow/05-x-com)
miracle – slow (http://www.restingbell.net/releases/r)
Tropico de Tauro – Sr. Aye https://soundcloud.com/sr-aye)

New SpaceTime episodes every Wednesday!

Hosted by Gabe Perez-Giz
Made by Kornhaber Brown (www.kornhaberbrown.com)

This is what a nuclear disaster area looks like.
Check out Audible: http://bit.ly/AudibleVe
Broadcast locations and times:

North America: PBS, July 28 & 29 @ 10pm ET / 9pm Central
Europe: ZDF/arte, July 31 @ 10pm
Australia: SBS, August 6, 13, 20 @ 8:30pm EST

Not broadcast in your country? Contact your local broadcaster and/or email http://www.genepoolproductions.com

Music by Kevin Macleod http://incompetech.com ‘Come Play With Me’ & ‘Lost Frontier’

Want to ask some sort of crazy question about Space?:
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
Support us on Patreon! http://www.patreon.com/pbsspacetime

Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll

Australia will perpetually encounter the season opposite to the one we in the northern hemisphere will encounter, so does this means that Australia will never get a white Christmas? You may think the answer is YES, but on this week’s episode of Space Time we look at how Earth’s orbit around the sun, tilt on its axis, and other motions combine with our own perception of time to make this answer not be as definite as you might think! Check it out!

Extra Credit:

Veritasium gyroscope video:
https://www.youtube.com/watch?v=ty9QSiVC2g0

Other resources on gyroscopic precession:
https://www.youtube.com/watch?v=jQEKhIovKA0
http://butikov.faculty.ifmo.ru/Gyroscope.pdf
https://www.youtube.com/watch?v=aZlT26lF5Fw

Other videos about leap years, years and the calendar:
https://www.youtube.com/watch?v=cGjP3vAZGa4 (It’s Okay to be Smart)
https://www.youtube.com/watch?v=53glKEPzElA (minutephysics)
https://www.youtube.com/watch?v=xX96xng7sAE (CGP Grey)

The tropical year and the solar calendar:
http://adsabs.harvard.edu/abs/1991JRASC..85..121B

Long-term orbit of Earth through space:
http://www.aanda.org/articles/aa/abs/2011/08/aa16836-11/aa16836-11.html
http://www.aanda.org/articles/aa/pdf/2011/08/aa16836-11.pdf

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Comments:

acapellascience
https://www.youtube.com/watch?v=gWYEnvMM1dA&lc=z12sgf2o4rytifkb404citkipn3pxr0gg54

Ben McLean
https://www.youtube.com/watch?v=gWYEnvMM1dA&lc=z121wpiymqqmxjv3c23rzvijanm5i5i22

Jack King
https://www.youtube.com/watch?v=gWYEnvMM1dA&lc=z12eezmbps3fcfty204cfrrwowq0wdlazss0k

Music:
Saw Slicing – Patternbased (https://soundcloud.com/patternbased)
Heisse Luft – Thompson and Kuhl (https://soundcloud.com/phlow/05-x-com)
u dont know im fadin
Deep Blue – Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto)
Earth Breath – Human Terminal (http://freemusicarchive.org/music/Hum…)
Tropico de Tauro – Sr. Aye https://soundcloud.com/sr-aye)
Secret Society – Logical Disorder (http://logicaldisorder.bandcamp.com/)

New SpaceTime episodes every Wednesday!

Hosted by Gabe Perez-Giz
Made by Kornhaber Brown (www.kornhaberbrown.com)

Want to ask some sort of crazy question about Space?:
Tweet at us! @pbsspacetime
Facebook: facebook.com/pbsspacetime
Email us! pbsspacetime [at] gmail [dot] com
Comment on Reddit: http://www.reddit.com/r/pbsspacetime
Support us on Patreon! http://www.patreon.com/pbsspacetime

Help translate our videos! http://www.youtube.com/timedtext_cs_panel?tab=2&c=UC7_gcs09iThXybpVgjHZ_7g

Let us know what topics you want to learn more about:
http://bit.ly/spacetimepoll

Everyone has their own opinion as to whether or not aliens exist. But let’s assume they do for a second and we wanted to let them know we’re here!!!! How should we signal our species’ existence through the expanse of space? There are a few options, but which is the most effective and the cheapest? Find out in this week’s episode of PBS Space Time!

Congrats to last week’s Balloon Challenge Winners!

Юра Сороквторой
Jonathan LeMoine
Russell Subedi
Stan Aron
Alexander Keebler

Extra Credit:

Low detectability of our radio leakage by aliens (and vice-versa):
http://www.jbis.org.uk/paper.php?p=2014.67.17
http://arxiv.org/pdf/1102.1938.pdf (free version of above)
http://www.faqs.org/faqs/astronomy/faq/part6/section-12.html
http://arxiv.org/abs/1007.0850

Benford, Benford, Benford paper:
http://arxiv.org/abs/0810.3966

Laser beacons / Optical SETI:
http://www.astronomynow.com/news/n1004/20seti4/
Also discussed in Benford paper

Luc Arnold paper on Transit Signatures of Artificial Objects:
http://iopscience.iop.org/0004-637X/627/1/534/ (open access)

Kepler data access page (public data):
http://keplergo.arc.nasa.gov/DataAnalysisRetrieval.shtml

COROT data access page (ESA’s transit telescope, also public data):
http://idoc-corot.ias.u-psud.fr

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Comments:

Blackmark52
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z12tujiyymayvzzrg04cjlc4qwnzilggu2s

Gary Oak
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z12detbgzqbsyhwxf04chjiz3reacd0b2g4

Mastikator
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z125itv4sr3dsjae0230zrqh0ridtrw0a

DJ braiser
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z125itv4sr3dsjae0230zrqh0ridtrw0a

joseph199627
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z125itv4sr3dsjae0230zrqh0ridtrw0a

clay eickemeyer
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z124yx3rxtrjhhruu23eu1fqvznrx15a404 

padriac54
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z13gxtfygkyxylsc222rdbwy0sfxzdbgk04

Euan Johnson
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z13uvbkh1mb1wbr4r04cihgoqpm4hjdb24c

Josh Mullins
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z13vybvynxqsud0o004cjvuybmvqgzwos0g

danx505
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z125i1xjhnuydl3wj04cedloane4sh34czw0k

Agen0000
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z12lfzrapz31hjx1t225gzn4homvglfil04

lexis lex
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z123whgovyq4jhp4x04cfxfp1mr5ivvhnio

Pedro Gusmao
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z13ytfrbgqedy1h2c23mibi5jqqitb5eo

Stephan W
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z130ifxjqwugul0w004chlhokriusfrpelk0k

George Mpantes
https://www.youtube.com/watch?v=NblR01hHK6U&lc=z130ifxjqwugul0w004chlhokriusfrpelk0k

Music:
Saw Slicing – Patternbased (https://soundcloud.com/patternbased)
Heisse Luft – Thompson and Kuhl (https://soundcloud.com/phlow/05-x-com)
u dont know im fadin
Deep Blue – Janne Hanhisuanto (https://soundcloud.com/jannehanhisuanto)
Earth Breath – Human Terminal (http://freemusicarchive.org/music/Human_Terminal/Press_Any_Key/01_Earth_Breath)
Tropico de Tauro – Sr. Aye https://soundcloud.com/sr-aye)
Secret Society – Logical Disorder (http://logicaldisorder.bandcamp.com/)

New SpaceTime episodes every Wednesday!

Hosted by Gabe Perez-Giz
Made by Kornhaber Brown (www.kornhaberbrown.com)

Uranium is a unique element, used in research, medicine, space travel, and of course weapons.
Not broadcast in your country? Contact your local broadcaster and/or email http://www.genepoolproductions.com

Documentary Dates:
US: PBS, July 28 & 29 @ 10pm ET / 9pm Central
France & Germany: ZDF/arte July 31 @ 10pm
Australia: SBS, August 6, 13, 20 @ 8:30pm EST

If you’re wondering where the title comes from…
“A number of ingenious experiments were devised to test the speed of the fission reaction, and the limit was pushed. But even so, I thought it would be very nice to go one step nearer to a real atomic explosion. Dick Feynman, who was present, started to chuckle and to say that this is just like tickling the tail of a sleeping dragon.”
Professor Otto R Frisch, January 1969 Physicist, the Manhattan Project.