.>> reporter: allen stern worked closely with the crew planning the experiment. now stern is the principal investigator for the highly acclaimed new horizons project. the 10 year long and counting mission to study pluto.>> from our friends who lost their lives on the challenger and for the loss of an opportunity to study halley's comet, those were all tragic. but i hope that some of the things that i have accomplished in some of the rest of us have accomplished since then can play tribute to their sacrifice.>> reporter: the special run on saturday night at 6:00 on 9news. we will repeat it sunday night at 7:30 on channel 20. as always, we hope you can join us. >>> so many connections to colorado. it's worth watching. we are so happy that gary and back.>>> theatergoers in washington state now have a new >>> we do have an update regarding the cement truck rollover at i-25 and university. we understand i-25 has reopened after the rollover this afternoon. one person was injured in the accident. we don't know the extent of the injuries at this point. denver police tell