| episode | air date | countdown | title |
| S09E06 | 2015-05-23 | | Roman Engineering | |
| S09E05 | 2015-05-16 | | Predicting the Future | |
| S09E04 | 2015-05-09 | | Alien Worlds | |
| S09E03 | 2015-05-02 | | Apocalyptic Visions | |
| S09E02 | 2015-04-25 | | The Eye of God | |
| S09E01 | 2015-04-18 | | Omens of Doom | |
|
| |
| S08E04 | 2014-03-22 | | Star of Bethlehem | |
| S08E03 | 2014-03-15 | | Heavenly Destruction | |
| S08E02 | 2014-03-08 | | Pyramids | |
| S08E01 | 2014-03-01 | | Stonehenge | |
|
| |
| S07E07 | 2012-06-17 | | When Space Changed History | |
| S07E06 | 2012-06-10 | | Ride the Comet | |
| S07E05 | 2012-06-03 | | Microscopic Universe | |
| S07E04 | 2012-05-20 | | Deep Freeze | |
| S07E03 | 2012-05-13 | | Our Place in the Milky Way | |
| S07E02 | 2012-05-06 | | Alien Sounds | |
| S07E01 | 2012-04-29 | | How Big, How Far, How Fast | |
| |
| S06E07 | 2011-12-20 | | God and the Universe | |
| S06E06 | 2011-12-13 | | UFO: The Real Deal | |
| S06E05 | 2011-11-29 | | Worst Days on Planet Earth | |
| S06E04 | 2011-11-22 | | Crash Landing on Mars | |
| S06E03 | 2011-11-08 | | How the Solar System was Made | |
| S06E02 | 2011-11-01 | | Nemesis: The Sun's Evil Twin | |
| S06E01 | 2011-10-25 | | Catastrophes that Changed the Planets | |
| |
| S05E08 | 2010-09-23 | | Dark Future of the Sun | |
| S05E07 | 2010-09-16 | | Total Eclipse | |
| S05E06 | 2010-09-02 | | Asteroid Attack | |
| S05E05 | 2010-08-26 | | Secrets of the Space Probes | |
| S05E04 | 2010-08-19 | | Time Travel | |
| S05E03 | 2010-08-12 | | Magnetic Storm | |
| S05E02 | 2010-08-05 | | Mars: The New Evidence | |
| S05E01 | 2010-07-29 | | 7 Wonders of the Solar System | |
| |
| S04E12 | 2009-11-10 | | Extreme Energy | |
| S04E11 | 2009-11-03 | | Science Fiction. Science Fact. | |
| S04E10 | 2009-10-27 | | Pulsars & Quasars | |
| S04E09 | 2009-10-20 | | Liquid Universe | |
| S04E08 | 2009-10-06 | | Space Wars | |
| S04E07 | 2009-09-29 | | The Search for Cosmic Clusters | |
| S04E06 | 2009-09-22 | | 10 Ways to Destroy the Earth | |
| S04E05 | 2009-09-15 | | The Hunt for Ringed Planets | |
| S04E04 | 2009-09-08 | | Biggest Blasts | |
| S04E03 | 2009-09-01 | | It Fell from Space | |
| S04E02 | 2009-08-25 | | The Day the Moon Was Gone | |
| S04E01 | 2009-08-18 | | Death Stars | |
| |
| S03E12 | 2009-02-03 | | Cosmic Phenomena | |
| S03E11 | 2009-02-03 | | Edge of Space | |
| S03E10 | 2009-01-27 | | Strangest Things | |
| S03E09 | 2009-01-13 | | Another Earth | |
| S03E08 | 2009-01-06 | | Stopping Armageddon | |
| S03E07 | 2008-12-23 | | Living in Space | |
| S03E06 | 2008-12-16 | | Deadly Comets and Meteors | |
| S03E05 | 2008-12-09 | | Alien Faces | |
| S03E04 | 2008-12-02 | | Sex In Space | |
| S03E03 | 2008-11-25 | | Light Speed | |
| S03E02 | 2008-11-18 | | Parallel Universes | |
| S03E01 | 2008-11-11 | | Deep Space Disasters | |
| |
| S02E18 | 2008-04-29 | | Cosmic Apocalypse | |
| S02E17 | 2008-04-22 | | Gravity | |
| S02E16 | 2008-04-15 | | Biggest Things in Space | |
| S02E15 | 2008-04-08 | | Wildest Weather in the Cosmos | |
| S02E14 | 2008-04-01 | | Nebulas | |
| S02E13 | 2008-03-11 | | Colonizing Space | |
| S02E12 | 2008-03-04 | | Cosmic Collisions | |
| S02E11 | 2008-02-26 | | Unexplained Mysteries | |
| S02E10 | 2008-02-19 | | Constellations | |
| S02E09 | 2008-02-12 | | Supernovas | |
| S02E08 | 2008-02-05 | | Space Travel | |
| S02E07 | 2008-01-29 | | Astrobiology | |
| S02E06 | 2008-01-15 | | Dark Matter | |
| S02E05 | 2008-01-08 | | Alien Moons | |
| S02E04 | 2007-12-18 | | The Milky Way | |
| S02E03 | 2007-12-11 | | Mysteries of the Moon | |
| S02E02 | 2007-12-04 | | Cosmic Holes | |
| S02E01 | 2007-11-27 | | Alien Planets | |
| |
| S01E14 | 2007-09-04 | | Beyond the Big Bang | |
| S01E13 | 2007-08-28 | | Search for ET | |
| S01E12 | 2007-08-21 | | The Most Dangerous Place in the Universe | |
| S01E11 | 2007-08-14 | | The Outer Planets | |
| S01E10 | 2007-08-07 | | Life and Death of a Star | |
| S01E09 | 2007-07-31 | | Alien Galaxies | |
| S01E08 | 2007-07-24 | | Saturn: Lord of the Rings | |
| S01E07 | 2007-07-17 | | The Inner Planets: Mercury & Venus | |
| S01E06 | 2007-07-10 | | Spaceship Earth | |
| S01E05 | 2007-06-26 | | The Moon | |
| S01E04 | 2007-06-19 | | Jupiter: The Giant Planet | |
| S01E03 | 2007-06-12 | | The End of the Earth: Deep Space Threats to ou | |
| S01E02 | 2007-06-05 | | Mars: The Red Planet | |
| S01E01 | 2007-05-29 | | Secrets of the Sun | |
