Funding for this research was provided by:
National Science Foundation (PHY-1708212, PHY-1809572, PHY-1806580)
National Aeronautics and Space Administration (80NSSC19K0322)
C.C.’s work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract to the National Aeronautics and Space Administration.
Text and Data Mining valid from 2019-11-18
Received: 4 June 2019
Accepted: 30 September 2019
First Online: 18 November 2019
: The authors declare no competing interests.