S02E17: Gravity
Explore how science and humanity discovered, overcame and utilized gravity.
Previous Episode 
Season 1
Secrets of the Sun
S1E1 / 29 May 2007
Mars: The Red Planet
S1E2 / 05 Jun 2007
The End of the Earth: Deep Space Threats to our Planet
S1E3 / 12 Jun 2007
Jupiter: The Giant Planet
S1E4 / 19 Jun 2007
The Moon
S1E5 / 26 Jun 2007
Spaceship Earth
S1E6 / 10 Jul 2007
The Inner Planets: Mercury & Venus
S1E7 / 17 Jul 2007
Saturn: Lord of the Rings
S1E8 / 24 Jul 2007
Alien Galaxies
S1E9 / 31 Jul 2007
Life and Death of a Star
S1E10 / 07 Aug 2007
The Outer Planets
S1E11 / 14 Aug 2007
The Most Dangerous Place in the Universe
S1E12 / 21 Aug 2007
Search for ET
S1E13 / 28 Aug 2007
Beyond the Big Bang
S1E14 / 04 Sep 2007
Season 2
Alien Planets
S2E1 / 27 Nov 2007
Cosmic Holes
S2E2 / 04 Dec 2007
Mysteries of the Moon
S2E3 / 11 Dec 2007
The Milky Way
S2E4 / 18 Dec 2007
Alien Moons
S2E5 / 08 Jan 2008
Dark Matter
S2E6 / 15 Jan 2008
Astrobiology
S2E7 / 29 Jan 2008
Space Travel
S2E8 / 05 Feb 2008
Supernovas
S2E9 / 12 Feb 2008
Constellations
S2E10 / 19 Feb 2008
Unexplained Mysteries
S2E11 / 26 Feb 2008
Cosmic Collisions
S2E12 / 04 Mar 2008
Colonizing Space
S2E13 / 11 Mar 2008
Nebulas
S2E14 / 01 Apr 2008
Wildest Weather in the Cosmos
S2E15 / 08 Apr 2008
Biggest Things in Space
S2E16 / 15 Apr 2008
Gravity
S2E17 / 22 Apr 2008
Cosmic Apocalypse
S2E18 / 29 Apr 2008
Season 3
Deep Space Disasters
S3E1 / 11 Nov 2008
Parallel Universes
S3E2 / 18 Nov 2008
Light Speed
S3E3 / 25 Nov 2008
Sex in Space
S3E4 / 02 Dec 2008
Alien Faces
S3E5 / 09 Dec 2008
Deadly Comets and Meteors
S3E6 / 16 Dec 2008
Living in Space
S3E7 / 23 Dec 2008
Stopping Armageddon
S3E8 / 06 Jan 2009
Another Earth
S3E9 / 13 Jan 2009
Strangest Things
S3E10 / 27 Jan 2009
Edge of Space
S3E11 / 03 Feb 2009
Cosmic Phenomena
S3E12 / 03 Feb 2009
Season 4
Death Stars
S4E1 / 18 Aug 2009
The Day the Moon Was Gone
S4E2 / 25 Aug 2009
It Fell From Space
S4E3 / 01 Sep 2009
Biggest Blasts
S4E4 / 08 Sep 2009
The Hunt for Ringed Planets
S4E5 / 15 Sep 2009
10 Ways to Destroy the Earth
S4E6 / 22 Sep 2009
The Search for Cosmic Clusters
S4E7 / 29 Sep 2009
Space Wars
S4E8 / 06 Oct 2009
Liquid Universe
S4E9 / 20 Oct 2009
Pulsars & Quasars
S4E10 / 27 Oct 2009
Science Fiction, Science Fact
S4E11 / 03 Nov 2009
Extreme Energy
S4E12 / 10 Nov 2009
Season 5
7 Wonders of the Solar System
S5E1 / 29 Jul 2010
Mars: The New Evidence
S5E2 / 05 Aug 2010
Magnetic Storm
S5E3 / 12 Aug 2010
Time Travel
S5E4 / 19 Aug 2010
Secrets of the Space Probes
S5E5 / 26 Aug 2010
Asteroid Attack
S5E6 / 02 Sep 2010
Total Eclipse
S5E7 / 16 Sep 2010
Dark Future of the Sun
S5E8 / 23 Sep 2010
Season 6
Catastrophes that Changed the Planets
S6E1 / 25 Oct 2011
Nemesis: The Sun's Evil Twin
S6E2 / 01 Nov 2011
How the Solar System was Made
S6E3 / 08 Nov 2011
Crash Landing on Mars
S6E4 / 22 Nov 2011
Worst Days on Planet Earth
S6E5 / 29 Nov 2011
UFO: The Real Deal
S6E6 / 13 Dec 2011
God and the Universe
S6E7 / 20 Dec 2011
Season 7
How Big, How Far, How Fast
S7E1 / 29 Apr 2012
Alien Sounds
S7E2 / 06 May 2012
Our Place in the Milky Way
S7E3 / 13 May 2012
Deep Freeze
S7E4 / 20 May 2012
Microscopic Universe
S7E5 / 03 Jun 2012
Ride the Comet
S7E6 / 10 Jun 2012
When Space Changed History
S7E7 / 17 Jun 2012
Season 8
Stonehenge
S8E1 / 01 Mar 2014
Pyramids
S8E2 / 08 Mar 2014
Heavenly Destruction
S8E3 / 15 Mar 2014
Star of Bethlehem
S8E4 / 22 Mar 2014
Season 9
Omens of Doom
S9E1 / 18 Apr 2015
The Eye of God
S9E2 / 25 Apr 2015
Apocalyptic Visions
S9E3 / 02 May 2015
Alien Worlds
S9E4 / 09 May 2015
Roman Engineering
S9E6 / 23 May 2015
David Ackroyd
