What happened to Mars’ atmosphere? Was it ever like Earth’s? NASA will answer these questions and more in a press conference today, being livestreamed on its UStream channel at 2 pm.

According to their press release, the participants of the conference will be:

  • Michael Meyer, lead scientist for the Mars Exploration Program at NASA Headquarters

  • Bruce Jakosky, Mars Atmosphere and Volatile Evolution (MAVEN) principal investigator at the Laboratory for Atmospheric and Space Physics (LASP) at the University of Colorado, Boulder

  • Jasper Halekas, MAVEN Solar Wind Ion Analyzer instrument lead at the University of Iowa, Iowa City

  • Yaxue Dong, MAVEN science team member at LASP

  • Dave Brain, MAVEN co-investigator at LASP

After the conference, there will be a Q&A session with the media, as well as a social media component by tagging questions with #AskNASA.