| Title | Date |
| The High-Energy Year in Review |  | December 28, 2009 |
| The Shape of Things that Were |  | December 21, 2009 |
| Blazing |  | December 14, 2009 |
| Heavy Metal Mine |  | December 7, 2009 |
| Do Look Back |  | November 30, 2009 |
| Solar Tsunami |  | November 23, 2009 |
| The LMC in Gamma Rays |  | November 16, 2009 |
| Long Distance Champion |  | November 9, 2009 |
| The Great Photon Race |  | November 2, 2009 |
| A Magnetic, High Energy Personality |  | October 26, 2009 |
| Edge Effect |  | October 19, 2009 |
| Darkness Dancing |  | October 12, 2009 |
| Andromeda Unchained |  | October 5, 2009 |
| Light from the Dawn of Time |  | September 28, 2009 |
| Cavities with Iron Fillings |  | September 21, 2009 |
| Heavyweight |  | September 14, 2009 |
| Neutron Star Storm |  | September 7, 2009 |
| Outskirts |  | August 31, 2009 |
| 405 |  | August 24, 2009 |
| What's the Matter with the Big Bang? |  | August 17, 2009 |
| Forwards and Backwards |  | August 10, 2009 |
| Outburst of a Magnetic Personality |  | August 3, 2009 |
| Decade |  | July 27, 2009 |
| Hope for the ISS |  | July 20, 2009 |
| Blind Pulsars |  | July 13, 2009 |
| Speed Gun |  | July 6, 2009 |
| Monitoring the Twist |  | June 29, 2009 |
| What Broke the Ball? |  | June 22, 2009 |
| Faster than a Speeding Photon? |  | June 15, 2009 |
| Enrichment |  | June 8, 2009 |
| A Cry from Long Ago |  | June 1, 2009 |
| The Color of Carina |  | May 25, 2009 |
| The Sun is Burning |  | May 18, 2009 |
| Resolving the Ridge |  | May 11, 2009 |
| Close to the Big Bang |  | May 4, 2009 |
| Pileup on the Intergalactic Freeway |  | April 27, 2009 |
| Cigar Afficionado |  | April 20, 2009 |
| Our Erratic Universe |  | April 13, 2009 |
| Serene Sun |  | April 6, 2009 |
| Onto and Out |  | March 30, 2009 |
| The Birth and Death of Stars |  | March 23, 2009 |
| Turn Turn Turn |  | March 16, 2009 |
| A Swiftly Tilting Comet |  | March 9, 2009 |
| Smoke Rings |  | March 2, 2009 |
| The Extremest |  | February 23, 2009 |
| Sparks after the Collision |  | February 16, 2009 |
| Bright Gamma Sky |  | February 9, 2009 |
| Evacuation Route |  | February 2, 2009 |
| CREAM over Ice |  | January 26, 2009 |
| Spinning Repeater |  | January 19, 2009 |
| Cas A in 4-D |  | January 12, 2009 |
| Born Again |  | January 5, 2009 |
